Best Primeval Labs Amino Acid Nutritional Supplements in 2026

DOUBLE STRENGTH L-ARGININE: NOW offers this non-GMO, double strength L-Arginine supplement in 1,000 mg tablets.

Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery

NITRIC OXIDE PRECURSOR*: Arginine plays an important role in the dilation of blood vessels.*

Amino acid/supports immune function: Glutamine is considered to be a conditionally essential amino acid, which means that under certain circumstances, the body may require more glutamine than it can produce. In that case, supplementing with glutamine may help with recovery of the amino acid in the body.

Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery

Nitrogen transporter: In the body, glutamine functions as a major nitrogen transporter and is critical for the maintenance of healthy nitrogen balance.Store in a cool, dry place after opening

VEGAN CAPSULES/NEUROTRANSMITTER SUPPORT*: 5-HTP is the intermediate metabolite between the amino acid L-tryptophan and serotonin

TYPICALLY USED AS A SLEEP SUPPLEMENT*/SUPPORTS POSITIVE MOOD AND RELAXATION*: 5-HTP supports the production of serotonin in the brain and central nervous system; serotonin can impact sleep, mood, appetite, and body temperature

CERTIFICATIONS/CLASSIFICATIONS: Dairy Free, Egg Free, Kosher, Made without Gluten, Non-GMO, Nut Free, Soy Free, Vegan/Vegetarian

NEUROTRANSMITTER SUPPORT*: NOW Double Strength 5-HTP has twice the 5-HTP (200 mg per capsule) as in our regular strength product (100 mg per capsule).

SUPPORTS POSITIVE MOOD*/WITH GLYCINE, TAURINE AND INOSITOL: 5-HTP, the intermediate metabolite between the amino acid tryptophan and serotonin, is extracted from the seed of an African plant (Griffonia simplicifolia).

CLASSIFICATIONS/CERTIFICATIONS: Non-GMO, Kosher, Dairy Free, Egg Free, Made without Gluten, Nut Free, Soy Free, Vegan/Vegetarian

OFFERS FITNESS SUPPORT*: NOW L-Carnitine 1,000 mg tablets are the purest form, clinically tested, and vegetarian (non-animal sourced).

BOOSTS CELLULAR ENERGY* AND TRANSPORTS FATTY ACIDS*: L-Carnitine is a non-essential amino acid that helps to maintain overall good health by facilitating the transfer of fatty acid groups into the mitochondrial membrane for cellular energy production.*

CLASSIFICATIONS/CERTIFICATIONS: Non-GMO, Kosher, Soy Free, Vegan/Vegetarian

OFFERS FITNESS SUPPORT*: NOW L-Carnitine 500 mg veggie capsules are the purest form, clinically tested, and vegetarian (non-animal sourced).

Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery

BOOSTS CELLULAR ENERGY* AND TRANSPORTS FATTY ACIDS*: L-Carnitine is a non-essential amino acid that helps to maintain overall good health by facilitating the transfer of fatty acid groups into the mitochondrial membrane for cellular energy production.*

CONDITIONALLY ESSENTIAL AMINO ACID: Arginine is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion, as well as in DNA synthesis and protein production.*

NITRIC OXIDE PRECURSOR*: Arginine plays an important role in the dilation of blood vessels.*

CLASSIFICATIONS/CERTIFICATIONS: Non-GMO, Kosher (contains gelatin), Soy Free

NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.

VEGAN CAPUSLES: Provides endurance for hard workouts and are proven to delay muscle fatigue.*

SUGGESTED USAGE: Suggested use is 3 capsules taken with water or your favorite NOW Sports drink up to 2-3 times daily with a two hour window in between doses.

SUPPORTS PROTEIN METABOLISM*: This non-essential amino acid is an important intermediate in the urea cycle, functioning along with other amino acids to rid the body of ammonia, a byproduct of protein metabolism.*

VEGAN CAPSULES/HEALTHY IMMUNE SYSTEM FUNCTION*: Citrulline also plays an important role in the healing process and in the maintenance of a healthy immune system.*

CERTIFICATIONS/CLASSIFICATIONS: Dairy Free, Egg Free, Kosher, Made without Gluten, Non-GMO, Nut Free, Soy Free, Vegan/Vegetarian

FREE-FORM/VEGAN CAPSULES: Essential amino acid necessary for the synthesis of proteins.*

NERVOUS SYSTEM SUPPORT*: Readily converted into the amino acid tyrosine, forming part of the structure of the neurotransmitters dopamine and norepinephrine, making it important for the maintenance of a healthy nervous system.*

CERTIFICATIONS/CLASSIFICATIONS: Soy Free, Nut Free, Vegan/Vegetarian, Non-GMO, Egg Free, Dairy Free, Made without Gluten

TRANSPORTS FATTY ACIDS*: Acetyl-L-Carnitine (ALC) is a modified amino acid that supports cellular energy production by assisting in the transport of fat into the mitochondria where it is converted into ATP (cellular fuel).*

Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery

BOOSTS CELLULAR ENERGY*: ALC is a highly bioavailable form of carnitine that can cross the blood-brain barrier, where it helps to manage typical oxidative stress, supports mitochondrial function, and helps to maintain normal neurotransmitter activity.*

NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.

MUSCULAR ENDURANCE*: Contains CarnoSyn, a patented form of beta-alanine that has been clinically tested and shown to increase muscle carnosine content, allowing muscles to work harder and longer during intense exercise.*

DELAYS MUSCLE FATIGUE*: Backed by scientific research demonstrating that CarnoSyn supplementation results in delayed muscle fatigue and rapid recovery time, thereby helping you attain your strength and endurance training goals.*

Same trusted quality with a brand new look! Packaging may vary

Helps Maintain Muscle Tissue*

Informed-Choice is an adulteration monitoring program through LGC that conducts monthly blind batch testing of registered products at the retail level and posts updated results on their website. The Informed-Choice logo indicates that these products have been tested for, and certified to be free of, banned substances through the Informed-Choice certification program.

NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.

PROTEIN METABOLISM/UREA DETOX*: Two complementary amino acids that are popular with athletes and other active individuals.

FOR SPORTS: Both of these amino acids are popular with athletes and other active individuals.

NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.

AMINO ACIDS/RECOVERY*: The branched-chain amino acids (BCAAs), leucine, isoleucine, and valine are essential amino acids and thus cannot be made in the body. BCAAs are critical for muscle protein synthesis, and because BCAAs can be used as fuel during intense exercise, BCAA supplementation can help to preserve existing muscle tissue.*

SUPPORTS HEALTHY AGING*: In addition, BCAAs can support the recovery process by promoting the normal repair processes that take place after exertion.* BCAAs also play an important role in the maintenance of proper immune system function and the support of healthy aging.*

VEGAN CAPSULES/NEUROTRANSMITTER SUPPORT*: 5-HTP is the intermediate metabolite between the amino acid L-tryptophan and serotonin.

TYPICALLY USED AS A SLEEP SUPPLEMENT*/SUPPORTS POSITIVE MOOD AND RELAXATION*: 5-HTP supports the production of serotonin in the brain and central nervous system; serotonin can impact sleep, mood, appetite, and body temperature.*

CERTIFICATIONS/CLASSIFICATIONS: Dairy Free, Egg Free, Kosher, Made without Gluten, Non-GMO, Nut Free, Soy Free, Vegan/Vegetarian

NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.

PROTEIN METABOLISM*/NITRIC OXIDE PRECURSOR*: Arginine supports protein metabolism and is heavily involved in muscle metabolism through its role in the maintenance of a proper nitrogen balance.*

NITRIC OXIDE PRECURSOR*: Arginine supports protein metabolism and is heavily involved in muscle metabolism through its role in the maintenance of a proper nitrogen balance.*

NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.

PROTEIN METABOLISM*: L-Arginine supports protein metabolism and is heavily involved in muscle metabolism through its role in the maintenance of a proper nitrogen balance.*

NITRIC OXIDE PRECURSOR*: L-Arginine is an important precursor of nitric oxide (NO) and thus plays a role in the dilation of blood vessels.*

BUILDS LEAN TISSUE*: Studies suggest that leucine, in conjunction with adequate dietary protein, may help to build and maintain lean tissue and optimize body composition.*

VEGAN POWDER/MIXES EASILY: NOW Sports Leucine Powder is instantized for easy mixing in water, beverages, or smoothies. No clumping.

FREE-FORM AMINO ACID: Leucine is one of the three BCAAs that is critical in muscle tissue structure.*

𝗚𝘂𝘁 𝗪𝗲𝗹𝗹𝗻𝗲𝘀𝘀 & 𝗣𝗿𝗼𝘁𝗲𝗰𝘁𝗶𝗼𝗻 - YourBiotics prebiotics and probiotics supplements help you to take control of your wellness, naturally & effectively. This pre and probiotics is designed to supply you with what you need based on what your body is dealing with. Now you can boost your immune system, support gut issues and get back to being truly well with this pre and probiotics for digestive health supplement.

𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗜𝗻𝗴𝗿𝗲𝗱𝗶𝗲𝗻𝘁 - These probiotics and prebiotics capsules have a special content called Archaea. In microbiology, Archaea are the ONLY extreme little creatures found in large numbers in extreme locations such as SALT FLATS, HOT SPRINGS , ACID MINES and even VOLCANOS. They help manage the millions of little defense squads running through your gut and body that assist your immune system to handle the waste, bad organisms, and heavy metals that damage it.

𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗲𝗱 𝗧𝗼 𝗕𝗲 𝗘𝗳𝗳𝗲𝗰𝘁𝗶𝘃𝗲 - These digestive enzymes with probiotics and prebiotics are designed to help you enjoy your day with their energy and immune-boosting effects. Probiotic capsules assist and improve Stomach & Digestive Disorders. They also help enhance your skin, hair, & joints. Our pre and probiotics for women may also help relieve sinus pressure. Probiotics multi enzyme gut health supplements for women and men

NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.

PROTEIN METABOLISM*: L-Arginine supports protein metabolism and is heavily involved in muscle metabolism through its role in the maintenance of a proper nitrogen balance.*

NITRIC OXIDE PRECURSOR*: L-Arginine is an important precursor of nitric oxide (NO) and thus plays a role in the dilation of blood vessels.*

Double Strength Vegan Capsules: This Product Has Twice The Taurine (1,000 Mg) As In Our Regular Strength Product (500 Mg).

Nervous System Health*/Healthy Visual Function*: Taurine Helps To Generate And Regulate Nerve Impulses And Aids In The Maintenance Of Fluid Balance; It Is Also Used By The Body In Visual Pathways, As Well As In The Brain And Nervous System, Where It Works Together With Glycine And Gaba As A Neurotransmitter.*

Stressed out? Take a Recess and add some calm to whatever you're drinking.

More than just a magnesium powder, our proprietary *magnesium superblend* calms the mind and lifts the mood with magnesium, adaptogens and electrolytes.

Now featuring 50% DV of magnesium per serving, with magnesium L-threonate, a new form of magnesium shown to effectively increase brain magnesium levels, passion flower and L-theanine to calm the mind, and electrolytes for hydration.

GAMMA-AMINOBUTYRIC ACID: GABA is naturally produced in the body and its presence within the central nervous system may help promote relaxation and ease nervous tension.

Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery

NEUROTRANSMITTER SUPPORT: A non-protein amino acid that functions as a neurotransmitter in the human brain.