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This vitamin is involved in forming DNA and red blood cells, as well as necessary for brain function, heart health, energy production, and more ( Its found naturally in many animal products and sometimes added to fortified foods ( Vegans, vegetarians, older adults, and people with digestive issues that can interfere with nutrient absorption may be at a higher risk of vitamin B12 deficiency and need to supplement ( summary Vitamin B12 is a water-soluble vitamin involved in several aspects of health, including DNA synthesis, red blood cell formation, and brain function

Some users report temporary fatigue or mood changes

Although many specialize, there are some that look to become a one-stop shop, from doing blood tests and writing prescriptions to tailoring your diet and providing physical manipulation

This leaves especially vegans to look for sources elsewhere

Mol Med Rep (2019) 20(3):270311

Topical cosmetic peptides like GHK-Cu, Matrixyl, and argireline are similarly non-concerns