gnc women's vitapak program energy and metabolism gnc gnc women’s vitapack program energy & metabolism: specifically formulated for calorie burn & mental sharpness* with a multivitamin blend clinically proven to make you feel better^, plus extra ingredients customized for calorie burn and mental sharpness, our women’s vitapak program energy & metabolism will help put pep in your step.* energy & metabolism – features a clinically studied calorie-burning blend plus caffeine for mental alertness* muscle fuel – l-carnitine helps use fatty acids as energy and fuel skeletal muscles* cardiovascular health – omega-3s and gla help support healthy blood lipids and cardiovascular health* 30-day supply ^in a randomized, double-blind, placebo-controlled study of 112 healthy volunteers, subjects taking the gnc vitamin and mineral blends for six weeks experienced significant improvements in serum levels of certain key nutrients compared to a placebo and a basic multivitamin formula based upon multivariate statistical analyses of a group of b vitamins (thiamin, niacin, riboflavin, pantothenic acid, biotin, folic acid and vitamins b-6 and b-12) and key antioxidants and carotenoids (a group of beta-carotene, alpha-tocopherol, selenium, lutein and lycopene). statistically significant improvements in sf-36 vitality and mental health scores were also observed compared to placebo. these statements have not been evaluated by the food & drug administration. this product is not intended to diagnose, treat, cure, or prevent any disease.