Category
Amino Acids
L-theanine, L-carnitine, BCAA, NAC and other amino acids
3001Source Naturals
L-Leucine 500 mg
75/100
capsule80 servings2 ingredients
3002Source Naturals
L-Lysine Powder
80/100
powder60 servings1 ingredient
3003Source Naturals
L-Methionine
80/100
powder66 servings2 ingredients
3004Source Naturals
L-Ornithine Powder
80/100
powder52 servings2 ingredients
3005Source Naturals
Proline & Lysine
67/100
tablet30 servings9 ingredients
3006Source Naturals
L-Tryptophan 1,000 mg
62/100
tablet45 servings2 ingredients
3007Source Naturals
L-Tyrosine Powder
80/100
powder149 servings1 ingredient
3008California Gold Nutrition
SAMe 400 mg
69/100
tablet60 servings1 ingredient
3009
Douglas Cooper Co.
5-HTP 50 mg
80/100
capsule90 servings1 ingredient
3010
ProCaps Laboratories
5-HTP 100 mg
70/100
capsule240 servings3 ingredients
3011
ProCaps Laboratories
Taurine 600
80/100
capsule30 servings1 ingredient
3012
Douglas Cooper Co.
L-Arginine 500 mg
75/100
capsule50 servings1 ingredient
3013
ProCaps Laboratories
NAC 500
73/100
capsule360 servings2 ingredients
3014California Gold Nutrition
TheanineUP Focused Energy
78/100
capsule60 servings4 ingredients
3015
Ortho Molecular Products
L-Theanine
75/100
capsule60 servings1 ingredient
3016Source Naturals
N-Acetyl L-Tyrosine 300 mg
71/100
tablet120 servings3 ingredients
3017Source Naturals
Taurine 1000
75/100
capsule120 servings1 ingredient
3018
Metabolic Nutrition
BCAA Unflavored
78/100
powder20 servings1 ingredient
3019Source Naturals
SAMe 400 mg
75/100
tablet30 servings1 ingredient
3020Source 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 5,071 amino acids products, L-Leucine 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.