This doesn't mean it's unsafe it means it hasn't gone through the specific regulatory pathway the FDA requires for approved drugs
A systematic review of 35 prospective cohort studies assessing the association between vitamin B 12 status and cognitive deterioration in older individuals with or without dementia at baseline did not support a relationship between serum vitamin B 12 concentrations and cognitive decline, dementia, or Alzheimers disease (79)
Br J Nutr 1989
Vitamin E, a lipid-soluble antioxidant, protects cell membranes from lipid peroxidation [42], while vitamin C, a water-soluble antioxidant, can regenerate vitamin E from its oxidized form and scavenge various ROS [43]
Dr Mercola, BodyBio, TERRA ELMNT, DEAL SUPPLEMENT, Fresh Nutrition and Cata-Kor met or exceeded their label claims
Other peptides are developed in a lab (synthetic peptides) and are used in research, cosmetics, and dietary supplements