While B12 injections are generally safe, they can cause side effects in some individuals, including mild pain at the injection site, nausea, dizziness, or headaches
Rather than directly supplying NAD+ precursors (like NMN or NR), it works by blocking an enzyme that consumes nicotinamide, theoretically preserving the substrate pool for endogenous NAD+ production
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Start only with medical guidance, and track what changes after you begin
They communicate with cells and tissues, instructing them to perform specific actions such as producing hormones, enzymes, or even supporting immune function