lump in arm after b12 injection What happens if you inject wrong? Hard Lump Under Injection Site:
Description
Vitamin B12 supplementation can improve all round general wellness

AOD 9604/MOTS-c is given as a subcutaneous injection on a provider-determined schedule
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Severe gastrointestinal disease or gastroparesis

But even if you and your veterinarian are able to get the underlying problem under control, the symptoms may not completely resolve because if left untreated, cobalamin deficiency causes vomiting, diarrhea, and weight loss
It is not recommended to take vitamin B12 if you are not diagnosed with vitamin B12 deficiency

Occasionally, mild soreness or redness may occur at the injection site