21st Century
D3, 25 mcg (1,000 IU), 60 Tablets
Strong Bones & Immune SupportVitamin SupplementGluten FreeGuaranteed Quality - Laboratory TestedVitamin D3 is essential for absorption of calcium and supports bones, teeth and immune system.
- Advanced Muscle Performance
- Vitapak® Program Performance + Endurance Support
- Includes Clinically Studied Multivitamin Blend^
- Improves Performance &; Increases Endurance♦
- Enhances Circulation &; Blood Flow
- Dietary Supplement
- Gluten Free
- 5 Products in 1 Pack
GNC AMP Men's Extreme Training Vitapak® Program delivers the power of five science-based formulas to help you maximize your physical and mental intensity and get the most from your workout.
Get The Nutritional Support Active Men Need - Clinically Studied Men's Multivitamin Blend Shown to Work Better Than a Basic Multivitamin^
Train Harder♦ - Clinically Studied Formula Improves Performance &; Increases Endurance♦
Enhance Circulation &; Blood Flow - L-Arginine &; Clinically Studied resVida® Resveratrol for Increased Nitric Oxide Production, Circulation &; Blood Flow
Stay Focused - Ginkgo biloba Supports Mental Sharpness
Protect Your Muscles - Clinically Researched Antioxidant Formula to Defend Against Damaging Free Radicals Caused by Intense Workouts.
If it's on our packages, then it's in our boxes. Clinically studied ingredients backed by real science. Get vitamins. Train harder. Get extreme.
^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). Statistical improvements in SF-36 Vitality and Mental Health scores were also observed compared to placebo.
♦ A double-blind, placebo-controlled, crossover study of 29 physically fit and healthy young adult male subjects averaging about 4 hours of exercise a week cycling to exhaustion at 80% V02 shows that these individuals were able to increase performance measured by time to exhaustion nearly 5 minutes longer than when taking placebo.
