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B12 shots help prevent this by supporting red blood cell production

A 2021 systematic review of 16 randomized controlled trials and 6,276 participants (Markun and colleagues, Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue, Nutrients, 2021) found that B12 supplementation does not reliably reduce fatigue in people who are not deficient

I have lost 3 pounds so far

However, like any exogenous compound that manipulates metabolic signaling, its important to monitor for potential issues

I have also referred a number of my close friends and they have achieved similar results

Learn about getting too much or too little vitamin B-6 in our B Vitamins Supplements Review, which includes our Top Picks among B-6 and other B vitamin supplements