can b12 injections cause skin rash 3 Rare But Serious Side Effects of Vitamin Supplements 10 Skin Signs You're Low

3 No reference is made to the serum value or a danger of overdosing, unlike for instance in case of a vitamin D or A deficiency

Possible adverse effects may include: Injection site reactions : Redness, swelling, irritation, or discomfort Gastrointestinal symptoms : Nausea, vomiting, stomach cramps, or diarrhea Headaches or dizziness Allergic reactions : Rash, itching, shortness of breath, or facial swelling (rare) Increased heart rate or anxiety (typically temporary from B-vitamins) Fatigue or weakness if used improperly Elevated liver enzymes when taken in excess particularly with methionine or choline Insomnia if taken late in the day due to increased energy levels Who should avoid or use caution

If you are low or deficient in B12, restoring healthy levels may improve fatigue and energy over time

B12 helps support brain function, and an imbalance may contribute to emotional changes or difficulties regulating mood