If youre feeling well and your provider confirms theres no underlying health concerns, high B12 levels from supplementation are usually harmless
Microvessel density and VEGF, HIF-1 expression in primary oral melanoma: correlation with prognosis
These treatments include NAC, melatonin, coQ10, thiamine, riboflavin, niacin B3, vitamins B6 and B12, folate, vitamins A, C, D and K, calcium, phosphorus, magnesium, sodium, potassium, chloride, iron, zinc, copper, selenium, iodine, vitamin E, vitamin K, L-arginine, inositol, biotin, pantothenic acid, eicosatetraenoic acid (EPA), docosahexaenoic acid (DHA) and various combinations of the above (188)
If you have additional risk factors (PCOS with 50% lower glutathione, IVF with 70-83% depleted antioxidants, gallbladder issues, choline deficiency), your effective "safe" dose may be significantly lower