Vegetarians may get some carnitine through dairy but dont get any creatine from their diets
If your body has trouble absorbing B12 from food or if you're not getting enough of it, these injections become especially helpful
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10.1038/s41419-022-05027-w 72
Supplements: Folate (as Calcium Folinate)(Folic Acid 800 mcg), Vitamin B12 (as Methylcobalamin), Calcium (from Dicalcium Phosphate), Phosphorus (from Dicalcium Phosphate), Zinc (from Zinc Citrate), Trimethylglycine (Betaine Anhydrous)
Further human studies are required to substantiate the claims