Category
Amino Acids
L-theanine, L-carnitine, BCAA, NAC and other amino acids
521California Gold Nutrition
L-Lysine 500 mg
75/100
capsule60 servings1 ingredient
522California Gold Nutrition
L-Taurine 1000 mg
75/100
capsule60 servings1 ingredient
523California Gold Nutrition
L-Theanine 100 mg
78/100
capsule30 servings1 ingredient
524Metabolic Maintenance
L-Theanine 200 mg
83/100
capsule120 servings1 ingredient
525Douglas Laboratories
N-Acetyl-L-Cysteine 900 mg
80/100
capsule90 servings1 ingredient
526California Gold Nutrition
L-Theanine 200 mg
78/100
capsule60 servings1 ingredient
527Source Naturals
Amino Day
75/100
tablet40 servings4 ingredients
528Source Naturals Serene Science
GABA Calm
66/100
lozenge120 servings5 ingredients
529Source Naturals
L-Arginine 500 mg
64/100
capsule50 servings3 ingredients
530Source Naturals
L-Citrulline 1000 mg
72/100
tablet30 servings1 ingredient
531Source Naturals
L-Glutamine 500 mg
75/100
capsule100 servings1 ingredient
532Source Naturals
L-Leucine 500 mg
75/100
capsule80 servings2 ingredients
533Source Naturals
L-Lysine Powder
80/100
powder60 servings1 ingredient
534Source Naturals
L-Methionine
80/100
powder66 servings2 ingredients
535Source Naturals
L-Ornithine Powder
80/100
powder52 servings2 ingredients
536Source Naturals
Proline & Lysine
67/100
tablet30 servings9 ingredients
537Source Naturals
L-Tryptophan 1,000 mg
62/100
tablet45 servings2 ingredients
538Source Naturals
L-Tyrosine Powder
80/100
powder149 servings1 ingredient
539California Gold Nutrition
SAMe 400 mg
69/100
tablet60 servings1 ingredient
540California Gold Nutrition
TheanineUP Focused Energy
78/100
capsule60 servings4 ingredients
Frequently Asked Questions
What is the best amino acids supplement?
Based on our analysis of 775 amino acids products, L-Lysine 500 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.