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Topical reactions: rare irritation , redness or dryness , especially at 3 %+ percentages on sensitive skin

Additionally, some payers limit the frequency of injections

These may include: Nausea and stomach upset Diarrhea Constipation Injection site redness or swelling Itching Headache Dizziness Blood clots Swelling In rare cases, some people may experience an allergic reaction to vitamin B12, which can cause symptoms such as hives, difficulty breathing, and swelling of the face, lips, tongue, or throat

With these core differences established, the next step is determining which option suits your specific health situation

Energy and mood improvements can appear within days for some people, while others notice changes after several weeks