A Little Extra Here are some favorite supplements that target beauty concerns. Slow-Growing Hair and Nails Concentrated beauty minerals like iron, zinc, copper, selenium and potassium can help support the growth of hair and nails. Try: Nutrex Hawaiian Spirulina Powder, nutrex-hawaii.com Lackluster Complexion According to Hart, a complexion that has lost its glow needs a well-rounded nutritional boost, with a little extra support for digestive health as well. Try: Neocell Collagen Beauty Builder, with Collagen, Hyaluronic Acid, Silica and Alpha Lipoic Acid, neocell.com; HUM Nutrition Raw Beauty Green Superfood Powder offers the extra bonus of adaptogens and skin superfoods like matcha and moringa, humnutrition.com Weak AND Brittle Hair Biotin supports…