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PMC 4178046

Too much estrogen being metabolized through CYP1B1 into 4-OHE1(E2) and the estrogen quinones can potentially be bad if your body has slower phase II (COMT, GSTP1, GSTM1, NQO1) enzymes.[ref][ref] The connection between smoking and estrogen-related cancers: Smoking significantly increases the risk of breast cancer and prostate cancer

It is considered to be advantageous in patients with TB, as there is no evidence of TB occurrence or reactivation associated with its use (101)

irritable bowel syndrome

It includes 1-5 intramuscular or subcutaneous injections of 1000 mcg crystalline cyanocobalamin daily, followed by oral doses of 1000-2000 mcg/day Parenteral administration should be reserved for those with significant neurological symptoms NICE guideline: Vitamin B 12 deficiency in over 16s: diagnosis and management: Malabsorption as the confirmed or suspected cause of vitamin B 12 deficiency: Offer replacement to people if: lifelong intramuscular vitamin B12 Autoimmune gastritis is the cause They have had a total gastrectomy They have had a complete terminal ileal resection If the person has a vitamin B 12 deficiency because of malabsorption that is not caused by autoimmune gastritis, or a total gastrectomy or complete terminal ileal resection (for example, malabsorption caused by coeliac disease, partial gastrectomy or some forms of bariatric surgery): Offer vitamin B 12 replacement and Consider intramuscular instead of