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503B Compounding Master Guide – GMP

A 2019 study found that older adults supplementing high doses of vitamin B12 were at an increased risk of colon cancer

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The most discussed effects are sexual in nature: a subset of users report reduced libido, erectile dysfunction, and ejaculatory changes in approximately two to four percent of users in clinical trials, though real-world reporting and patient advocacy groups suggest this number may undercount persistent cases [6]