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prescription, accepts payment only in cryptocurrency, or labels its vials "research chemical, not for human use." Prices that sit far below every licensed pharmacy, the absence of a reachable pharmacist, and no requirement for a clinical review are each signals that the product may be counterfeit, mislabeled, or non-sterile

The method you choose depends on what you're treating

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The symptoms of B12 deficiency are often non-specific and can overlap with other conditions or general life stressors

Not everyone sees the lack of side effects as a positive: Anything without side effects is probably not very active, Parnham said