Category
Amino Acids
L-theanine, L-carnitine, BCAA, NAC and other amino acids
201
NOW
L-Tyrosine 500 mg
75/100
capsule30 servings1 ingredient
202NOW
L-Tyrosine 750 mg - Extra Strength
78/100
capsule30 servings1 ingredient
203NOW
L-Tryptophan 500 mg
80/100
capsule30 servings1 ingredient
204NOW
L-Tryptophan 1000 mg
74/100
tablet30 servings1 ingredient
205
NOW Sports
Pro-GH
69/100
powder34 servings9 ingredients
206NOW Sports
Acetyl-L Carnitine
80/100
powder113 servings1 ingredient
207NOW Sports
L-Arginine Powder
80/100
powder217 servings1 ingredient
208NOW Sports
Branched Chain Amino Acid Powder
80/100
powder68 servings3 ingredients
209NOW
L-Citrulline
80/100
powder75 servings1 ingredient
210NOW
GABA
80/100
powder340 servings1 ingredient
211NOW Sports
L-Glutamine Powder
80/100
powder34 servings1 ingredient
212NOW
Glycine
80/100
powder454 servings1 ingredient
213NOW
L-Lysine
80/100
powder822 servings1 ingredient
214NOW Sports
L-Ornithine
80/100
powder227 servings1 ingredient
215
Nature's Plus
Free Form Amino Acid L-Glutamine 500 mg
78/100
capsule30 servings1 ingredient
216NOW
Taurine Powder
80/100
powder227 servings1 ingredient
217
Nature's Plus
Free Form Amino Acid L-Lysine 500 mg
78/100
capsule30 servings1 ingredient
218NOW
L-Tryptophan Powder
80/100
powder57 servings1 ingredient
219
Nature's Plus
Free Form Amino Acid L-Methionine W/Vitamin B-6 500 mg
68/100
capsule30 servings2 ingredients
220NOW
L-Tyrosine
80/100
powder283 servings1 ingredient
Frequently Asked Questions
What is the best amino acids supplement?
Based on our analysis of 5,071 amino acids products, L-Tyrosine 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.