Category
Amino Acids
L-theanine, L-carnitine, BCAA, NAC and other amino acids
421Nutricost
SAMe 400 mg
75/100
capsule60 servings1 ingredient
422Nutricost
L-Serine 500 mg
75/100
capsule120 servings1 ingredient
423California Gold Nutrition
Acetyl-L-Carnitine 500 mg
75/100
capsule60 servings1 ingredient
424California Gold Nutrition SPORT
BCAA 500 mg
75/100
capsule60 servings1 ingredient
425Source Naturals
Glycine 500 mg
75/100
capsule100 servings2 ingredients
426Source Naturals Serene Science
Theanine Serene
75/100
tablet30 servings7 ingredients
427Source Naturals
L-Arginine 1,000 mg
75/100
tablet100 servings2 ingredients
428Source Naturals
L-Citrulline 500 mg
75/100
capsule30 servings1 ingredient
429California Gold Nutrition
L-Arginine 500 mg
75/100
capsule60 servings1 ingredient
430California Gold Nutrition
L-Citrulline 500 mg
75/100
capsule60 servings1 ingredient
431California Gold Nutrition
L-Cysteine 500 mg
75/100
capsule60 servings1 ingredient
432California Gold Nutrition
L-Glutamine
75/100
capsule60 servings1 ingredient
433California Gold Nutrition
L-Lysine 500 mg
75/100
capsule60 servings1 ingredient
434California Gold Nutrition
L-Taurine 1000 mg
75/100
capsule60 servings1 ingredient
435Source Naturals
Amino Day
75/100
tablet40 servings4 ingredients
436Source Naturals
L-Glutamine 500 mg
75/100
capsule100 servings1 ingredient
437Source Naturals
L-Leucine 500 mg
75/100
capsule80 servings2 ingredients
438Source Naturals
Taurine 1000
75/100
capsule120 servings1 ingredient
439Source Naturals
SAMe 400 mg
75/100
tablet30 servings1 ingredient
440Source Naturals
Taurine, 1,000 mg
75/100
capsule240 servings1 ingredient
Frequently Asked Questions
What is the best amino acids supplement?
Based on our analysis of 775 amino acids products, SAMe 400 mg ranks #1 with a SupplementScore of 75/100. Scores are based on label quality - dosage transparency, formulation cleanliness, and ingredient disclosure.
How are amino acids supplements scored?
Every product is scored algorithmically using data from the NIH Dietary Supplement Label Database. The SupplementScore evaluates dosage transparency (35 pts), label completeness (25 pts), formulation cleanliness (25 pts), and ingredient profile (15 pts).
Does a higher score mean the supplement works better?
No. The score reflects label quality, how transparent and clean the product label is, not clinical efficacy, bioavailability, or safety. A higher score means better label practices, not guaranteed results.