Regarding hair loss: testosterone can convert to DHT, which may accelerate male-pattern hair loss in men who are genetically predisposed
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For those who do not get enough B12 through their diet, B12 supplements can be taken to meet daily needs
rigorous solo-vs-combined trials remain rare, and most stacking claims rest on mechanistic plausibility rather than direct head-to-head data (see stacking review)
PMID: 18763991
Food and Drug Administration, (en) Carmel, How I treat cobalamin (vitamin B 12 ) deficiency , Blood , n o 112 (6), 2214-2221 (lire en ligne) (en) EFSA (autorit europenne de scurit sanitaire), Tolerable Upper Intake Levels for Vitamins and Minerals, EU, EFSA, p