Best Vegetarian Amino Acid Supplements in 2026

GNC Mega Men Sport: A Clinically Studied Multivitamin^ Outperform The Competition With A Time Released Sport Multivitamin^*. Giving your all in the gym or on the field can cause you to lose key vitamins through sweat. GNC Mega Men Sport uses timed release technology to deliver a high potency multivitamin blend clinically shown to work better than a basic multivitamin and clinically proven to improve nutrient levels and feelings of mental wellbeing^*. Fuel Next-Level Performance And Energy*.

GNCs high potency multivitamin blend is clinically shown to help you feel better, more rejuvenated, and absorb key nutrients*^.

Crafted for men's health and an active lifestyle with proven ingredients to support muscle performance, energy production, and a healthy immune system*

Supports protein synthesis and muscle repair*

3000mg of amino acids per serving

Supplementing with amino acids can help provide additional support for the maintenance and recovery of lean muscle*

GNC Men's ArginMax: Sexual Health Formula for Men GNC Men's ArginMax is an advanced sexual health formula. This patented formula helps support sexual desire and improves sexual performance and staying power.* ArginMax features L-Arginine, an amino acid that enhances nitric oxide production. Nitric oxide helps maintain blood vessel tone, which plays a key role in sex. Also contains ginkgo biloba, which supports increased peripheral blood flow, and zinc, which is required for normal reproduction

30-day supply

Timed-Release

HIGH-CALORIE MASS GAINER: GNC Pro Performance Bulk 1340 is a scientifically formulated mass gainer that delivers 1,340 calories per serving and 50g of high-quality protein to help you increase size and overall strength when used in conjunction with an exercise program.

RECOVER WITH BCAA: Formula features 11g branched chain amino acids (BCAA) and glutamine, an important amino acid which is involved in protein synthesis and plays an important role in hydrating muscle cells.

BANNED SUBSTANCE-FREE MASS GAINER: Bulk 1340 Mass Gainer has been tested for over 145 banned substances and is and certified Banned Substance.^

GNC L-Arginine and L-Citrulline: Help Maintain Blood Vessel Tone GNC L-Arginine and L-Citrulline is an amino acid dietary supplement that can fuel nitric oxide production. Nitric oxide is essential for many aspects of your health—perhaps one of its most important functions is improving vasodilation for your blood vessels, which allows oxygen and nutrients to travel throughout your body. L-Arginine supplement helps maintain blood vessel tone L-Arginine and L-Citrulline supplements help to

FUEL NITRIC OXIDE: L-Arginine and L-Citrulline supplements work together to increase nitric oxide production

FUEL YOUR MUSCLES: L-Arginine plays a role in protein synthesis and can help fuel your muscles

HIGH-CALORIE MASS GAINER: GNC Pro Performance Bulk 1340 is a scientifically formulated mass gainer that delivers 1,340 calories per serving and 50g of high-quality protein to help you increase size and overall strength when used in conjunction with an exercise program.

RECOVER WITH BCAA: Formula features 11g branched chain amino acids (BCAA) and glutamine, an important amino acid which is involved in protein synthesis and plays an important role in hydrating muscle cells.

BANNED SUBSTANCE-FREE MASS GAINER: Bulk 1340 Mass Gainer has been tested for over 145 banned substances and is and certified Banned Substance.^

CARDIOVASCULAR SUPPORT DOG SUPPLEMENT – Improve your dog's overall health and wellness with GNC Pets ADVANCED Cardio Soft Chews, made with botanicals, antioxidants, and amino acids

EASY TO CHEW DOG SUPPLEMENT – If your dog has an aversion to swallowing pills, these easy to chew soft chews are the way to go! They make getting the nutrients your dog needs easier than ever

DELICIOUS CHICKEN FLAVOR DOGS LOVE – GNC Pets ADVANCED Dog Cardio Soft Chews for Dogs satisfy their taste buds while improving their insides

ABOUT THE PRODUCT: GNC Women's Collagen is a comprehensive solution to help improve the appearance of your skin from within. This supplement is formulated with a blend of ingredients to help support collagen synthesis and provide the body with essential building blocks for a healthy glow.

ENHANCED COLLAGEN: Designed to nourish and rejuvenate your body. Our enhanced collagen delivery system may stimulate your body to effectively renew tissues, helping you maintain a radiant, youthful skin complexion. Our collagen supplement may also help increase muscle mass, prevent bone loss and relieve joint pain.

IMPROVED ELASTICITY: GNC's Collagen with Hyaluronic Acid and Vitamin C supports the vital structure of your skin's elasticity and your skin's natural antioxidant response to protect against free-radical damage.

GNC Pro Performance L-Carnitine Supplement:  L-Carnitine is a popular amino acid among bodybuilders, weight trainers and serious athletes because of its role in facilitating the metabolism of long chain fatty acids.* Pro Performance L-Carnitine provides 500 mg of this important nutrient per pill. Provides 500 mg L-Carnitine per serving

Facilitates muscle recovery*

Gluten free