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Peptide Sciences formerly the dominant vendor generating $7.4 million per month shut down in March 2026
Some drugs (including colchicine and metformin), as well as vitamins like vitamin C and folic acid, can reduce the levels of vitamin B12 in your body or affect the absorption of it
24, 299326, doi: 10.1146/annurev.nutr.24.012003.132440 (2004)
Like peptides, they are not approved for human use and are seen as experimental drugs with a risk of serious liver damage, thrombosis and heart problems
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