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b12 injection is iv or im Vitamin Sites: All You Need to Know B12 Shots vs. IV Infusions:
Description
Sharma A, et al
What If I Take MOTS-c Before 5-Amino-1MQ

Vitamin B12 is a nutrient that your body doesn't make, so you have to get it from animal products, such as meats, dairy, and eggs, or from supplements

Do they offer real benefits
Sharabi A, Cohen E, Sulkes J, Garty M (2003) Replacement therapy for vitamin B12 deficiency: comparison between the sublingual and oral route
