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These are not rare anecdotes they appear consistently across patient forums and in clinical observations

doi: 10.3390/microorganisms7110502

Since garlic supplements have been found to inhibit platelet aggregation (90), there is a potential for additive effects when garlic supplements are taken together with other medications or supplements that inhibit platelet aggregation, such as high-dose fish oil or vitamin E (157)

Requirements of vitamin B12 in excess of normal (due to pregnancy, thyrotoxicosis, hemolytic anemia, hemorrhage, malignancy, hepatic and renal disease) can usually be met with oral supplementation