1000 mcg b12 injection Methylcobalamin 10,000mcg injectable, 10mL (lyophilized) Most people get enough vitamin B12 in their diet Vitamin B12 Injection: Energy Boost

and if shelf life is 28 days, and I am to inject this into his subq once a week

B100 Complex 10ml vial - Vitamin B Complex Each Vial and milliliter contains the vitamins B1 - B2 - B6 - B3 Nicotinamide Vitamin B1 (Thiamine) 100mg Vitamin B2 (Riboflavin) 0.5mg B3 Nicotinamide (Active form of B3) 100mg Vitamin B6 (Pyridoxine) 1mg 10 Doses per vial For Intramuscular or Intravenous injection Expires: FEB 2028 GMP Quality is Guaranteed For personal use only ~ Limit 12 Per Order ~ Learn More *Long descriptions can be found below the reviews

3 ml Syringe : Description : A larger capacity syringe that can hold up to 3 ml of fluid

Delivered directly into your bloodstream, it helps fight fatigue, reduce stress, and improve clarity, perfect for busy professionals, athletes, or anyone with low B12 levels

One advantage of supplements is that your body doesn't need to have hydrochloric acid in the stomach to separate the B12 from the protein it's attached to, as it does for food