Vitamin F is not a real vitamin. It’s not even one single nutrient. I would say it’s almost like a vitamin complex, similar to vitamin B — what with all its B3s and B5s and B12s — but that’s not quite right, either. So what is vitamin F, and why is it in your skincare? So glad you asked. Read more: Multivitamins Vs. Individual Vitamins — Which Are Better For You? “‘Vitamin F,’ in short, stands for fat,” Dr. Mamina Turegano, M.D., F.A.A.D., a dermatologist who works with direct-to-consumer