feel weird after b12 injection Vitamin Side Effects and Safety Vitamin B12 deficiency causes fatigue,

This isnt a bad thing the vitamin B12 used in shots is called cyanocobalamin, which is almost identical to the natural version of B12 found in food sources

Penetrating muscle tissue is painful, and you might also hit a nerve by accident

If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Vegan sources such as fortified foods or supplements are available if needed

Key Benefits Rapid Bioavailability Intramuscular or slow IV administration bypasses gastrointestinal limits for immediate plasma levels

Featured Hospira Products Available Our selection of Hospira products covers a wide range of needs for healthcare facilities and individuals: Single-dose Hospira sterile water for injection and 0.9 sodium chloride injection USP Hospira options for straightforward drug dilution and safe administration