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Allergic reactions: Hypersensitivity to B12 or other components can manifest as urticaria, pruritus, orrarelyanaphylaxis

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When receiving vitamin B12 injections, you are likely to feel some pain in the injection area, redness, itchiness, diarrhea, and you may also feel like your entire body is swelling

Oral Supplements: Generally take longer to show noticeable results, especially if absorption is compromised

Much of what is sold online is labeled research only, and the purity of those products is highly variable, with independent testing repeatedly finding under-dosed, degraded, or mislabeled peptides across the unregulated market

PMID 26915364