b12 injection vs b12 vitamin Dosage B12 Shots vs. IV Infusions:

Methylcobalamin and adenosylcobalamin represent the two active forms that participate directly in cellular metabolism

Heavy smokers and drinkers can also have low levels of B12

Exercise and regulation of carbohydrate metabolism

Vitamin B12 dosage The average recommended daily amounts, measured in micrograms, vary by age: Infants up to age 6 months: 0.4 micrograms Babies aged 7-12 months: 0.5 micrograms Children aged 1-3 years: 0.9 micrograms Kids aged 4-8 years: 1.2 micrograms Children aged 9-13 years: 1.8 micrograms Teens aged 14-18 years: 2.4 micrograms Adults (19+ years): 2.4 micrograms Pregnant: 2.6 micrograms Breastfeeding: 2.8 micrograms Vitamin B12 foods You can get vitamin B12 from animal products, which have it naturally, or from foods that have been fortified with it

(b) a low serum concentration of vitamin B12 with a normal folate concentration