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B12 and Premature Greying One area where B12s role is more clearly established is in premature greying grey hair that appears before age 20-30 (depending on ethnicity)

Nevertheless, caution is advised in patients with a history of cardiovascular disease

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Many companies claim third-party tested, but testing only matters when the laboratories are credible and the results are actually reviewed

(PubMed) Shen L, Ji HF

As serum B12 levels drop below whats considered deficient, MMA levels start to increase more drastically (Clarke, 2003)