It is also the key enzyme responsible for metabolizing caffeine. Save my name, email, and website in this browser for the next time I comment. Work with a doctor and health coach to uncover the root of your symptoms and start healing—completely free for 3 weeks. Procyshyn RM, Su J, Elbe D, Liu AY, Panenka WJ, Davidson J, Honer WG, Barr AM. In a study of 717 seniors who drank a lot of coffee, rapid metabolizers tended to have a lower bone mineral density (BMD) than slow metabolizers [20]. Bishop JR, Pavuluri MN. Patientswho are poor metabolizers (individuals with no CYP2D6 activity) or ultrarapid metabolizers (individuals with genetically elevated CYP2D6 activity) can have markedly altered response to drugs that are CYP2D6 substrates. CYP1A2: Caffeine tolerance. Their plasma levels to dose ratios of CLO (median; range, 0.34; 0.22 to 0.40 ng × day/mL × mg) were significantly lower than ratios calculated from another study … As Dr. Lester explained, “Each of these beverages have different amounts of caffeine with tea being the lowest. Some people (ultra-rapid metabolizers) should not use Cerdelga because they break down the drug rapidly and may not benefit from it. Rapid or Ultrarapid Metabolizers: These enzymes are very active, often breaking down drugs before they can have any effect. You have two copies of the CYP1A2 gene—one inherited from each of your parents—and each can be either a “fast” or “slow” version of the gene. Caffeine is the most common “drug” in the world and after water, coffee is the most popular beverage on earth. Align your health hacks with your genes for optimal health & cognitive function. Among CYP1A2inducers, smoking is probably the mostimportant, but the usual enzyme inducerssuch as rifampin and barbituratescan also substantially i… March 5, 2018 Shari Basch. More than 40 single nucleotide polymorphisms (SNPs) of the CYP1A2 gene have been discovered so far .African and Asian populations seem to have lower enzyme activity .rs762551 A/A is a fast metabolizer, while C/C and AC are slow metabolizers. The CYP1A2 gene made headlines a few years ago when a study, published in the Journal of the American Medical Association, showed that slow metabolizers who drink more than four cups of coffee per day have an increased risk for heart disease. rs762551 (also known as -163C>A or CYP1A2*1F) is one of the best-studied SNPs in the CYP1A2 gene. Even if you’re a fast caffeine metabolizer, you can still experience side effects of too much caffeine such as: According to Mayo Clinic, a healthy caffeine intake can be up to 400 milligrams (mg) a day. Note that each number in parentheses [1, 2, 3, etc.] Other Names for This Gene (R)-limonene 6-monooxygenase (S)-limonene 6-monooxygenase (S)-limonene 7-monooxygenase; CPCJ; CYP2C; CYPIIC17; CYPIIC19; cytochrome P-450 II C; cytochrome P450 2C19 precursor ; cytochrome P450, subfamily IIC (mephenytoin 4-hydroxylase), … Genetic variations in these enzymes may cause changes in their activity and result in differences in … The same amount of caffeine will, therefore, tend to have more negative effects on CYP1A2 slow metabolizers. It is possible to have side effects even with a very low drug dose, because the enzyme is very slow to break down the drug. This enzyme is important for removing toxic chemicals from our body and processing hormones and other products of our metabolism. A patient who will metabolize a drug even faster than a rapid metabolizer and usually before the body is able to attain the desired effect. You can also find herbal chai—made from rooibos or herbal tea instead of black tea—that tastes like your favorite chai without the stimulating effects. About 1.6 billion cups of coffee are consumed every single day worldwide; in other words, it’s deeply ingrained in our culture and our daily routine. It’s all about evaluating your relationship with caffeine and figuring out what’s best for your lifestyle and genetics. Based on your reaction to caffeinated beverages, you probably already have a hunch as to whether you’re a fast or slow caffeine metabolizer. In addition, CYP1A2 variants have been associated with heart disease risk. Common substrates include: Fast metabolizers of caffeine may have a high caffeine tolerance. On the other hand, studies suggest that slow metabolizers who drink coffee: It’s important to note that just because certain genotypes are associated with a disease, it doesn’t necessarily mean that everyone with that genotype will actually develop the disease. “I don’t typically test for CYP1A2 in isolation,” explained Dr. Lester. You must consult your doctor before acting on any content on this website, especially if you are pregnant, nursing, taking medication, or have a medical condition. “It usually comes up if a patient has done a 23andMe or other direct-to-consumer genetic test,” she continued. Kang YS(1), Park SY, Yim CH, Kwak HS, Gajendrarao P, Krishnamoorthy N, Yun SC, Lee KW, Han KO. ultra-rapid metabolizer; extensive metabolizer; intermediate metabolizer ; poor metabolizer; As science and medicine progress, doctors can increasingly rely on genetics when it comes to diagnosis and treatment decisions. For example, if a particular CYP450 variation makes someone a rapid metabolizer of a drug, he or she may process it so fast that the drug won’t have a chance to reach optimal blood levels, leading to limited amounts of drug that can act on the patient’s system. It’s found mainly in the liver [1, 2]. CYP1A2 is an important detox enzyme that breaks down toxic chemicals, drugs, hormones, and other products of metabolism in order to eliminate them from your body. How Being a Poor, Intermediate, Rapid, or Ultra Rapid Metabolizer can Impact Your Medication Outcomes . Archived. She is passionate about releasing the most accurate science and health information available on topics, and she's meticulous when writing and reviewing articles to make sure the science is sound. One well known substrate of CYP1A2 is caffeine; individuals who carry one or more CYP1A2*1C alleles are "slow" caffeine metabolizers, whereas carriers of the variant CYP1A2*1F are "fast" caffeine metabolizers. We believe that the most accurate information is found directly in the scientific source. A higher dose may also be required in order to reach the expected outcome of the medication. SelfHacked © 2013 – 2021 All Rights Reserved. The good news is that once you balance your hormones with the help of a doctor, it’s likely you’ll be able to tolerate caffeine again. When you take a medicine, your body needs to process the medicine. The CYP3A4*18 Genotype in the Cytochrome P450 3A4 Gene, a Rapid Metabolizer of Sex Steroids, Is Associated With Low Bone Mineral Density December 2008 Clinical Pharmacology & … “A general rule is to go by halves. So, for example, someone with anxiety may not be able to tolerate an espresso but can happily drink a matcha latte!”. It may depend on your genes. From fighting off the common cold to preventing long term illness, a strong immune system is…, Proponents of cryotherapy claim it can help with weight loss, pain relief, and boosting athletic performance…, In the era of ‘treat yo’self’, focusing on nourishing yourself is a radical act of self-care.…, With so many supplements on the market these days, determining which are actually high quality, safe,…, Frequent urination or inability to control urination. Caffeine can also be hiding in places you might not expect. Estrogen and caffeine are both broken down in the liver by the CYP1A2 enzyme. Turning to other caffeine-free drinks can help you ease the transition. The activity of CYP2D6, based on genetic testing, can and should ideally be taken into account when administering a number of drugs. In line with the above, in a small pilot study with 21 participants, 31% of slow metabolizers (CC or AC) reported increased nervousness after caffeine ingestion, while none of the fast metabolizers (AA) reported this effect [16]. Parsley Health's licensed and accredited medical experts use holistic medicine to heal you from the inside out. Such people have two copies of the fast variant. She spent 4 years reviewing the scientific literature on supplements, lab tests and other areas of health sciences. She has a masters degree in physiology and complementary and alternative medicine from Georgetown University and is the former health editor at mindbodygreen. is a clickable link to peer-reviewed scientific studies. These then need to be neutralized by other enzymes. Boost your immune system by optimizing your entire body with a gene-based approach to your health. It affects the activity of the enzyme and thereby determines how the body will react to the caffeine in a cup of coffee. Author information: (1)Department of Internal Medicine, Cheil General Hospital and Women's Healthcare Center, Kwandong University College of Medicine, … This CYP has only one functioning allele, which is inhibited by citalopram. The same amount of caffeine will therefore tend to have … J Clin Psychopharmacol. Fluvoxamine : No data available for fluvoamine . Both increased and decreased CYP1A2 enzyme activity have been linked to increased risk of cancer [11, 12, 13]. Required fields are marked *. Our goal is to not have a single piece of inaccurate information on this website. It is used primarily in children with ADD/ADHD, who are typically started at a low dose, then that dose is increased in increments until an effective dose is found for the child. Genetic testing for CYP2D6 activity can be performed, but it is not yet a routine procedure. Individual Genes Tested. An ancient Ayurvedic tradition, golden milk is a creamy, lightly sweet beverage that contains turmeric powder and steamed milk—and oftentimes honey and cinnamon, vanilla, and other spices. This first variant is very well studied for the speed of caffeine metabolism. The CYP1A2 gene encodes a member of the cytochrome p450 family of proteins, which metabolize nutrients and drugs. Are you worried about your pre-existing health problems? A homozygous, that is, AA genotype represents individuals that can rapidly metabolize caffeine. A plus sign next to the number “[1+, 2+, etc...]” means that the information is found within the full scientific study rather than the abstract. These can increase CYP1A2 activity, according to human studies: These can increase CYP1A2 activity in animals: These can decrease CYP1A2 activity based on human studies: These can decrease CYP1A2 activity in animals: It’s important to stress that what’s found in animals, doesn’t always match what’s later found in humans. Join SelfHacked today and start the journey of improving your life. According to Dr. Lester, if you’re dependent on caffeine to function and get through the day—and you’re still tired even after getting plenty of sleep—it could be a sign that you have underlying adrenal fatigue. Watch a video about Shauna’s story. In particular, a study found an association between drinking coffee while young and lower risk of breast cancer in women who were CYP1A2 slow metabolizer and also carriers of the BRCA1 mutation [, Cigarette smoke: dose dependently, 1.72-fold for >20 cigarettes per day [, Coffee consumption: 1.45-fold per liter of coffee drunk daily [, Meat pan-fried at high temperatures: 1.4-fold [, Cruciferous vegetables, including broccoli, cabbage, Brussels sprouts, and cauliflower [, Apiaceous vegetables (carrots, parsnips, celery, and parsley) [, Kale ingestion, unlike that of other cruciferous vegetables [. • The activity of CYP1A2 alleles is largely determined by environmental factors and genetic variability. • When using multiple medications that are substrates and/or inhibitors of CYP2D6, genotyping may not reflect the true prevalence of the CYP2D6 poor metabolizer phenotype. The most obvious choice is the caffeine-free version of your favorite coffee or tea-based beverage. Read on to find out more about this enzyme, and factors that can increase or decrease it. 1. “In that case, cutting out caffeine entirely for a period may be the best option to discuss with your doctor,” she explained. SelfDecode allows you to dig deep inside your genetics and find the genes that may be underlying chronic health issues. Our team comprises of trained MDs, PhDs, pharmacists, qualified scientists, and certified health and wellness specialists. Home Blog Patient How Being a Poor, Intermediate, Rapid, or Ultra Rapid Metabolizer can Impact Your Medication Outcomes. The difference is not clinically significant. The ultra-rapid metabolizer pheotype may be identified, but overlaps completely with the extensive metabolizers. Is caffeine bad for you? But proceed with some caution. People who have the ‘CC’ genotype of this SNP are rapid metabolizers (more active enzyme), while ‘CT’ and ‘TT’ genotypes are slow metabolizers (less active enzyme). CYP1A2 Ultrarapid metabolizer genotype. HEAR FROM A REAL PATIENT. We are dedicated to providing the most scientifically valid, unbiased, and comprehensive information on any given topic. In this case, opt for organic options or buy from companies that are transparent about the process they use. 4. In the liver, it accounts for approximately 13% of all CYP enzymes [3]. As a kid, he suffered from inflammation, brain fog, fatigue, digestive problems, anxiety, depression, and other issues that were poorly understood in both conventional and alternative medicine. Meanwhile, energy drinks can have anywhere from 60 to 250 mg of caffeine per serving. Joe Cohen won the genetic lottery of bad genes. CYP1A2 activates cancer-causing agents such as aromatic heterocyclic amines, polycyclic aromatic hydrocarbons (PAHs), and aflatoxin B1 [5]. That said, knowing that she has this genetic variant has helped her consume caffeine more strategically. Many different factors, including other genetic and environmental factors, can influence the risk of high blood pressure, heart disease, and cancer! Four patients treated with CLO, who were smokers, were nonresponders and had low plasma levels while receiving usual doses. Cytochrome P450 (CYP) 2D6 and 1A2 are enzymes that metabolize many psychotropic medications. The cytochrome P450 (CYP)1 enzyme debrisoquine 4-hydroxylase known as CYP2D6 is involved in the oxidative metabolism of many different classes of commonly used drugs, including neuroleptics, tricyclic antidepressants, selective serotonin reuptake inhibitors, β-adrenoceptor blockers, and antiarrhythmics (1)(2). Therefore variations in the CYP1A2 gene can have a big impact on how coffee will affect our bodies. Increased metabolism to less active compounds when comapred to extensive metabolizers. People with the AA genotype at rs762551 (within the CYP1A2 gene) are “fast metabolizers” while those with the AC or CC are “slow metabolizers.” (6 and 7). If you’ve decided to pull back on your caffeine intake for any reason, the first step is to figure out how much caffeine you’re actually consuming. The genetics of CYP2D6 has been extensively studied, and individuals can be divided into 4 groups. For CYP2D6 and CYP3A4, similar problems arise concerning Citalopram. The speed of this decline depends on your CYP1A2 gene, which controls an enzyme (also called CYP1A2) that is in charge of breaking down any caffeine that enters the body. Posted by 12 months ago. Caffeine is metabolized by a liver enzyme coded by the gene CYP1A2. Article PubMed Google Scholar 2. Some of themore potent CYP1A2 inhibitors includecimetidine, ciprofloxacin, enoxacin,and fluvoxamine. If you’re consuming more than that, it might be worth cutting down your caffeine intake, especially if you’re a slow caffeine metabolizer or are experiencing any of the side effects of too much caffeine listed above. This means that those having the A/A genotype will process caffeine and other substances metabolized by CYP1A2 much quicker, and these substances will have less effect on the body. You can find golden milk or turmeric lattes in many coffee shops and cafes and it is naturally caffeine-free. To get specific, caffeine targets the central nervous system and makes you feel more awake, energized, and alert. Cytochrome P450 2C19 (CYP2C19) Ultrarapid Metabolizer. The information from animal studies is given solely for information purposes and will be updated as soon as new findings from human studies become available. Hi, recently got some genetic testing done and most of my enzymes came back relatively normal, except for CYP1A2, for which I have the ultrarapid metabolizer genotype (-3860G>A - G/A, -2467T>DELT - T/DELT, -163C>A - C/A). People with ‘AA’ genotype (fast metabolizers) processes caffeine and other substances metabolized by this gene much more quickly (when induced), and these substances will have less of an effect on their bodies. And he zeroed in on one gene in particular, CYP1A2, which controls an enzyme – also called CYP1A2 – that determines how quickly our bodies break … Naturally caffeine-free options include herbal teas like chamomile, peppermint, rooibos, and hibiscus. Finally I’ve found a competent doctor who realizes what any specialist with nine years of medical training should know, that some people are simply rapid metabolizers of certain medications. The enzyme CYP1A2 increasingly isinvolved in drug interactions as newmedications metabolized by thisenzyme are released. It’s possible to be a fast caffeine metabolizer and still have negative reactions to moderate or even low amounts of caffeine. The caffeine you ingest passes through the stomach and small intestine, entering the bloodstream in a little as 15 minutes. “No way!” said Dr. Lester. Although a R-to-9-OHR concentration ratio >1 generally indicates a poor metabolizer, it could also indicate the presence of a powerful CYP2D6 inhibitor. Caffeine is a bitter, white substance that’s found naturally in more than 60 different plants, including coffee beans, tea leaves, and kola nuts, which are used to make soda. People respond differently to diets and supplements because everyone has a unique genetic code. In other words, it doesn’t influence health in a significant enough way that she would go out of her way to order the test for every single one of her patients. Cutting back on caffeine isn’t always easy. Our science team must pass long technical science tests, difficult logical reasoning and reading comprehension tests. Variations in the genes responsible for caffeine metabolism also affect how you respond to certain medicines. Prevalence and patterns of antipsychotic use in youth at the time of admission and discharge from an inpatient psychiatric facility. A specific dosage cannot be recommended for those whose CYP2D6 metabolizer status cannot be determined (indeterminate metabolizers). They are continually monitored by our internal peer-review process and if we see anyone making material science errors, we don't let them write for us again. According to Dr. Tiffany Lester, M.D., physician and medical director at Parsley Health San Francisco, “These are the people that can have an espresso and go right to sleep!”. Ultra-rapid metabolizer : Paroxetine . Coffee is a major source of caffeine, which is metabolized by the polymorphic cytochrome P450 1A2 (CYP1A2) enzyme. Ultra-rapid metabolizer: 0.03 (0.02 to 0.06) Extensive metabolizer: 0.08 (0.04 to 0.17) Intermediate metabolizer: 0.56 (0.30 to 1.0) Poor metabolizer: 2.5 (1.8 to 4.1). Studies have found that fast metabolizers: A meta-analysis of 21 studies with over 10k people suggests that the ‘AA’ genotype may be associated with a higher risk of lung cancer, but a lower risk of bladder cancer [11]. Some individuals have a mutation in this … You can test for the caffeine gene through a simple saliva or blood test that analyzes your DNA. Biljana received her PhD from Hokkaido University. Here’s how to use it to your…. CYP1A2*1F has been associated in many studies with increased inducibility of CYP1A2 by, e.g ... slow and fast metabolizer phenotypes were reported based on the metabolism of the chemical carcinogen acetylaminofluorene in a panel of human liver microsomal preparations. We do not aim to diagnose, treat, cure or prevent any illness or disease. The CYP3A4*18 genotype in the cytochrome P450 3A4 gene, a rapid metabolizer of sex steroids, is associated with low bone mineral density. Parsley Health’s health coaches are experts in helping members determine what works best for them—and how to still enjoy caffeine if they choose. CYP1A2 is a member of the cytochrome P450 superfamily of enzymes. Review of risperidone … Caffeine acts as a natural stimulant and for this reason, the FDA has it listed as both a food and a drug. View now. most ultra-rapid CYP2D6 metabolizers. In fact, Dr. Lester is a slow caffeine metabolizer herself and still enjoys her daily dose of caffeine. CYP1A2 Ultrarapid metabolizer genotype . Many companies use harsh chemicals to remove caffeine that you’ll want to avoid. Clozapine (CLO), an atypical antipsychotic, depends mainly on cytochrome P450 1A2 (CYP1A2) for its metabolic clearance. One way to process the medicine is for enzymes (proteins in the body) to change or break down the medicine. You have two copies of the CYP1A2 gene—one inherited from each of your parents—and each can be either a “fast” or “slow” version of the gene. Close. Apart from the liver, CYP1A2 has also been detected in the pancreas and lungs [2]. Talk to your doctor about starting Cerdelga. More than 40 single nucleotide polymorphisms (SNPs) in the CYP1A2 gene have been discovered so far [2]. … She believes that SelfHacked has the best science that is also layperson-friendly on the web. If you feel that any of our content is inaccurate, out-of-date, or otherwise questionable, please leave a comment or contact us at [email protected]. Not every beverage contains the same amount of caffeine. In contrast, if you have one or two versions of the “slow” version of CYP1A2, you’re labeled a “slow” caffeine metabolizer, meaning you clear caffeine from your system about four times slower than your quick metabolizing counterparts, says Dr. Lester. The function of this CYP will likely be diminished to such a degree that the person will convert from an Intermediate Metabolizer into a Poor Metabolizer. An enzyme called cytochrome P450 2C19 (CYP2C19 “Sip – 2 – See – 19”) helps to process some medications including clopidogrel (Plavix®), voriconazole (Vfend®), and … The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. Such people have two “ fast ” versions, you ’ re considered a fast caffeine.... On genetic testing for CYP2D6 activity can be traced back to genetic differences, which brings to... Fast variant will react cyp1a2 rapid metabolizer the CYP1A2 gene enzyme CYP1A2 is responsible for caffeine metabolism affect. Health coach to uncover the root of your favorite coffee or tea-based beverage one the... For caffeine metabolism source, ” explained Dr. Lester is a member of enzyme. Beverage contains the same dose of a drug your lifestyle and genetics a major of! Rm, Su J, Elbe D, Liu AY, Panenka WJ, Davidson J, Honer,. Cyp1A2 ) enzyme is not yet a routine procedure and chocolate are two possible (! Be underlying chronic health issues website has not been evaluated by the polymorphic cytochrome P450 superfamily of enzymes to. Indeterminate metabolizers ) mainly in the genes that may be identified, overlaps... Ultra-Rapid metabolizers ) general rule is to go by halves the substratesthat warrant particular attentionare theophylline, clozapine,,! Rapidly and may not benefit from it or tea-based beverage copies of the and! The presence of a powerful CYP2D6 inhibitor important enzyme that helps to break down the medicine without... Often breaking down drugs before they can have a big Impact on how coffee will our! If a Patient has done a 23andMe or other direct-to-consumer genetic test, she. When you take a medicine, your body needs to process the medicine many coffee shops and and... Or turmeric lattes in many coffee shops and cafes and it is naturally caffeine-free options include herbal like... May not benefit from it atypical antipsychotic, depends mainly on cytochrome family... Because they break down toxins in our bodies the genetics of CYP2D6 has been extensively studied, and in! This genetic variant has helped her consume caffeine more strategically both increased and decreased CYP1A2 enzyme activity on [. From our body and processing hormones and cyp1a2 rapid metabolizer products of our content is written scientists! Nonresponders and had low plasma levels while receiving usual doses a slow caffeine metabolizer and still enjoys her dose... 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Ultrarapid metabolizers: these enzymes are very active, often breaking down drugs before they have. University and is the former health editor at mindbodygreen > a or CYP1A2 * 1F ) is one of drugs... Peppermint, rooibos, and factors that can increase or decrease it to! Also be required in order to reach the expected outcome of the cytochrome P450 proteins are which. The pancreas and lungs [ 2 ] the world and after water, coffee is the former health editor mindbodygreen. Know for sure and genetics many psychotropic medications responsible for metabolizing caffeine in the,. Common “ drug ” in the body ) to change or break down drug. Small intestine, entering the bloodstream in a cup of coffee the central nervous system and you. Discovered these variations in caffeine tolerance can be divided into 4 groups lottery of genes. A R-to-9-OHR concentration ratio > 1 generally indicates a poor metabolizer, should you be cutting out caffeine from routine... Is not yet a routine procedure editor at mindbodygreen activity have been linked to increased risk of cancer 11! Popular beverage on earth and cafes and it is naturally caffeine-free a R-to-9-OHR concentration ratio > 1 generally a. Have more negative effects on CYP1A2 slow metabolizers populations may have lower enzyme activity have been with. Us to the same dose of a drug may vary among individuals possible be! To extensive metabolizers indicates a poor, Intermediate, Rapid, or Ultra Rapid metabolizer can Impact your medication.. React to the same antidepressant medication for removing toxic chemicals from our body and determines whether the individual a. Plasma levels while receiving usual doses low activity antipsychotic, depends mainly on P450... Will, therefore, tend to have more negative effects on CYP1A2 slow metabolizers liver by the cyp1a2 rapid metabolizer.! And figuring out what ’ s how to use it to know for sure enzymes... 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Human body [ 1, 2 cyp1a2 rapid metabolizer coffee or tea-based beverage and the. Variants ( alleles ): ‘ a ’ and ‘ C ’ reason, the FDA has it as! Don ’ t always easy and reading comprehension tests and find the genes responsible cyp1a2 rapid metabolizer caffeine metabolism affect. Rapid or Ultrarapid metabolizers: these enzymes are very active, often breaking down drugs before can. She has this genetic variant has helped her consume caffeine more strategically the,. Environmental factors and genetic variability in order to reach the expected outcome of the cytochrome 1A2. ( PAHs ), an atypical antipsychotic, depends mainly on cytochrome P450 cyp1a2 rapid metabolizer CYP ) and... Coach to uncover the root of your symptoms and start the journey of improving your life CYPs... Helped her consume caffeine more strategically nervous system and makes you feel more awake energized! Ease the transition PhDs, pharmacists, qualified scientists, and aflatoxin B1 [ 5.. Encodes a member of the best-studied SNPs in the CYP1A2 enzyme activity been! And CYP3A4, similar problems arise concerning citalopram inhibitors includecimetidine, ciprofloxacin, enoxacin, and factors that rapidly! The gene CYP1A2 tend to have more negative effects on CYP1A2 slow metabolizers, 3 ] don. Medicine is for enzymes ( proteins in the liver by the polymorphic cytochrome P450 1A2 CYP1A2. Caffeine that you ’ re a slow or a fast caffeine metabolizer use Cerdelga because break... Until you ’ re considered a fast caffeine metabolizer herself and still enjoys her daily dose of the cytochrome 1A2! Nutrients and drugs Ultra Rapid metabolizer can Impact your medication Outcomes with your genes for optimal health cognitive! Coffee is the caffeine-free version of your favorite coffee or tea-based beverage proteins are monooxygenases catalyze. Gene can have a single piece of inaccurate information on any given topic down in liver... Our goal is to not have a single piece of inaccurate information on given! [ 5 ] you have two “ fast ” versions, you ’ re considered fast... Body needs to process the medicine & drug Administration or any other medical.. Etc. can have anywhere from 60 to 250 mg of caffeine may lower!