[131] [132] Species from the following genera and the following individual species are known to synthesize B 12 : Propionibacterium shermanii , Pseudomonas denitrificans , Streptomyces griseus , Acetobacterium , Aerobacter , Agrobacterium , Alcaligenes , Azotobacter , Bacillus , Clostridium , Corynebacterium , Flavobacterium , Lactobacillus , Micromonospora , Mycobacterium , Nocardia , Proteus , Rhizobium , Salmonella , Serratia , Streptococcus and Xanthomonas
For example, a study published in the American Journal of Clinical Nutrition found that B12 supplements reduced homocysteine levels and improved heart health in older adults
Semaglutide suppresses appetite, while AOD-9604 and Tesamorelin impact growth hormones
Vitamin B12 shots are a particularly good option for people who cant manage their vitamin B12 levels without making any dietary changes, are older, have had weight loss surgery, and take certain medications