Koi Peptides was our best overall, with research-grade material listed, high stated purity, and a certificate of analysis for each batch
Your body uses it for a few important jobs: Making red blood cells, which carry oxygen and keep your energy up Turning the food you eat into usable energy, which supports your metabolism Keeping your nerves healthy and preventing tingling or numbness Supporting mood, focus, and mental clarity A shot delivers B12 straight into the muscle and bloodstream, so it skips the digestive system entirely
The vial is a lyophilized arginine-salt version, labeled for laboratory research use only
These shots are especially useful for people who have trouble with the absorption of vitamins from the diet or supplements, such as the elderly, those with certain gastrointestinal disorders, or those on strict vegetarian or vegan diets
There is some evidence that the diabetes drug metformin (Glucophage) may reduce vitamin B12 absorption when used for several years
Athletes may be using these substances in the belief that they will give them an edge, although how common these illicit practices are is unknown, as they are shrouded in secrecy