Print Friendly, PDF & Email

CYP1B1 is an important detox enzyme that helps combat oxidative stress. This enzyme is also important for eye development. Mutations in the CYP1B1 gene are associated with congenital glaucoma. On the other hand, lower activity of this enzyme may be protective against obesity and cancer, by regulating the levels of steroid hormones in our bodies. Learn more about this enzyme and factors that can increase or decrease its activity.



The enzyme CYP1B1 is one of the cytochrome P450 monooxygenases (CYPs). These are enzymes that eliminate most of the drugs and toxins from the human body (R).

Read more about CYPs here.

CYP1B1 Function

This enzyme metabolizes:

  • steroid hormones (R), including estrogens (R, R). CYP1B1 is also responsible for the final steps in the production of cortisol and aldosterone (R).
  • fatty acids and fat-soluble vitamins (R, R).
  • melatonin (R).
  • retinol and dietary plant flavonoids (R).
  • polycyclic aromatic hydrocarbons (PAHs), biphenyls, N-heterocyclic amines, arylamines, aminoazo dyes, and other cancer-causing and toxic environmental chemicals (R, R).
  • CYP1B1 metabolizes few, if any, clinical drugs (R).

CYP1B1 Location

This enzyme is found in the liver, but also in various other tissues including fat, skin, breast gland, prostate, heart, blood vessels, kidney, thymus/marrow and immune cells, breast, uterus, brain, and eyes (R, R, R, R, R).

CYP1B1 The Good

An important role of CYP1B1 is that it helps reduce oxidative stress (R, R). CYP1B1 deficiency results in increased oxidative stress in mice (R).

Also, this enzyme is important for eye development (R, R). Many mutations in CYP1B1 cause primary congenital glaucoma (R, R).

This enzyme can protect from cancer. CYP1B1 deficient mice have more lung tumors (R).

Finally, CYP1B1 supposedly activates salvestrols, compounds found in vegetables, fruits and herbs, that then help fight cancer. However, there are no scientific studies backing these claims.

CYP1B1 The Bad

This enzyme is produced by fat tissue, and it helps increase fat uptake (R).

In mice, CYP1B1 deficiency increases AMPK, reduces obesity, reduces blood pressure and improves glucose tolerance (R, R).

Furthermore, this enzyme is capable of activating a wide range of cancer-causing compounds (R, R).

CYP1B1 activity was shown to promote the growth and metastasis of non-small lung cancer cells (R) and may promote the growth of renal cell carcinoma (kidney cancer) cells (R).

CYP1B1 Gene Polymorphism

More than 150 SNPs have been reported for this gene (R, R).

Many of the mutations cause primary congenital glaucoma (R, R).

rs10012 alters androgen (testosterone) concentrations (1499 cases and 1373 controls) (R), with the C variant being more active (R).

This may explain the association of the C variant with increased disease aggressiveness in prostate cancer (1387 subjects) (R).

The C variant was also associated with an increased risk of endometrial cancer (200 subjects) (R).

On the other hand, the G variant was associated with urinary bladder cancer (492 subjects) (R).

This variant is also known as Ala119Ser.

rs1056827 T is the more active variant of the enzyme (R).

This variant (T) correlates with urinary bladder cancer (492 subjects) (R), higher risk of prostate cancer (meta-analysis, 34 studies, 17,796 cases and 19,891 controls) (R) and breast cancer (same meta-analysis, 17,796 cases and 19,891 controls) (R).

 rs1056836 is also known as Leu432Val.

People with the G variant for rs1056836 have higher enzyme activity (about 3 fold) (R, R).

G increases susceptibility to hepatocellular carcinoma (983 subjects) (R), multiple myeloma (1061 sucjects) (R), lung cancer (meta-analysis, 22 studies, 2881 cases and 3653 controls) (R), and endometrial cancer, but lowers the risk of ovarian cancer (meta-analysis, 115 studies, 54,124 cases and 62,932 controls) (R) and prostate cancer (1387 subjects) (R).

Having two C variants (C/C) increases bloating, facial hair, palpitations, and involuntary urination in premenopausal women. Also, C/C increases the experience of nausea, bloated stomach, facial hair, and vaginal dryness in peri- and postmenopausal women. Carriers of C/C or C/G were approximately five times more likely to suffer from vaginal dryness than the G/G women (299 women) (R).

G was associated with shorter average telomere length in postmenopausal women taking hormonal therapy (259 subjects) (R). Short telomere length is associated with premature aging and age-related disease.

This snip is also known as Asn453Ser.

G was associated with decreased risk of endometrial cancer (meta-analysis, 48 studies, 30,532 cases and 39,193 controls) (R).

  • RS150799650

rs150799650 T was associated with urinary bladder cancer (492 subjects) (R).

Increasing or Decreasing CYP1B1

These increase CYP1B1:

  • Diesel exhaust particles (DEP) (R).
  • Tetrahydrocannabinol (THC), found in cannabis (R).
  • UV exposure (R).
  • Biotin supplementation (R).

These decrease CYP1B1:

Health Tools I Wish I Had When I Was Sick

At SelfHacked, it’s our goal to offer our readers all the tools possible to get optimally healthy. When I was struggling with chronic health issues I felt stuck because I didn’t have any tools to help me get better. I had to spend literally thousands of hours trying to read through studies on pubmed to figure out how the body worked and how to fix it.

That’s why I decided to create tools that will help others cut down the guesswork:

  • Lab Test Analyzer – a software tool that will analyze your labs and tell you what the optimal values are for each marker — as well as provide you with actionable tips and personalized health and lifestyle recommendations to help you get there.
  • SelfDecode – a software tool that will help you analyze your genetic data from companies such as 23andme and ancestry. You will learn how your health is being impacted by your genes, and how to use this knowledge to your advantage.
  • SelfHacked Secrets – an ebook where we examine and explain the biggest overlooked environmental factors that cause disease. This ebook is a great place to start your journey if you want to learn the essential steps to optimizing your health.
  • SelfHacked Elimination Diet course – a video course that will help you figure out which diet works best for you
  • Selfhacked Inflammation course – a video course on inflammation and how to bring it down
  • Biohacking insomnia – an ebook on how to get great sleep
  • Lectin Avoidance Cookbook – an e-cookbook for people with food sensitivities
  • BrainGauge – a device that detects subtle brain changes and allows you to test what’s working for you
  • SelfHacked VIP – an area where you can ask me (Joe) questions about health topics

FDA Compliance

The information on this website has not been evaluated by the Food & Drug Administration or any other medical body. We do not aim to diagnose, treat, cure or prevent any illness or disease. Information is shared for educational purposes only. 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.


1 Star2 Stars3 Stars4 Stars5 Stars (1 votes, average: 5.00 out of 5)


  • Michael Cleary

    Apologies for the typos !


  • Michael Cleary

    Suggestion: ref BCJ 2002 Issue 86 pps 774-8.
    The employment of salvestrols will never be subject to the scientific protocols re Professor Gerry Potter and Emeritis Dan Burke. The results obtained since then have given us 25 anecdotal results which are worthy of attention. Perhaps you apply for these.
    Atted to the video, “Professor Dan Bure interview with Othokinness” Danny explains the function really well. Bio-availability is enhanced with niacin, biotin, Vit C. Please apply for our essays. May help your readers.

    Kind regards,

    Michael Cleary

  • Leave a Reply

    Your email address will not be published. Required fields are marked *

    This site uses Akismet to reduce spam. Learn how your comment data is processed.