This peptide, found naturally in almost all human cells, plays fundamental roles in tissue repair and regeneration
That is the evidence gap, stated plainly: the mechanism is well-motivated and the preclinical signal is consistent, but no human study has confirmed that any of it translates to people, at any dose, by any route
If you have a Vitamin B12 deficiency and pernicious anaemia which disrupts your ability to absorb B12 from your food, regular intramuscular injections of Vitamin B12 will bypass the need for gut absorption and deliver the vitamin directly into your bloodstream
doi:10.1007/s12603-010-0330-4
By boosting energy levels and reducing fatigue, they may help improve overall activity and exercise performance
The clinician will use a fine needle and inject it into the fatty tissue