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Those sites offer sufficient depth and mass to absorb the concentrated solution while minimizing the chance of leakage into surrounding tissue

Because no recommendation on our list is prohibitively expensive, and some brands advise users to take multiple servings daily, we looked past sticker prices and per-serving breakdowns and chose our cost winner based on per-day use

Vitamin B12 injections are easily found online if you want to buy them for self-administration

The science is promising

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