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This was painful and caused my leg to jerk and I pulled out the needle without thinking

Bulut EA, Soysal P, Aydin AE et al (2017) Vitamin B12 deficiency might be related to sarcopenia in older adults

Support Healthy Hair, Skin, and Nails Vitamin B12s role in cell production extends to hair, skin, and nail health

Treat this needle with respect: don't touch its tip or the inside of your ampoule/vial to maintain sterility
