Because vitamin A is fat soluble, the body stores excess amounts. If too much vitamin A is stored, it can become toxic.

What it costs: Medik8 is a little on the pricier side but certainly far from outrageous. The brand’s products all cost ...

making it a cornerstone of the BioGrow RX formula that targets individuals seeking to restore their hair’s vitality. Vitamin A is a critical nutrient that enhances collagen production ...