Supplement Ratings

iHerb picks

Best Amino Acids on iHerb

Skip hours of label reading. Every pick below is sold on iHerb and passed our label check with 60+ points, so whatever you choose is worth taking, and you see today's price before you click.

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AllAmino AcidsAntioxidants & LongevityAshwagandha & AdaptogensB VitaminsBiotinBlood Sugar SupportBrain & NootropicsCalciumCollagenCoQ10CreatineDigestive HealthEye HealthGreens & SuperfoodsHeart HealthHerbs & BotanicalsHormone & Sexual HealthImmune SupportIronJoint SupportLiver & DetoxMagnesiumMelatonin & SleepMinerals & ElectrolytesMultivitaminsMushroomsOmega-3 & Fish OilPre-WorkoutProbioticsProtein SupplementsTurmeric & CurcuminUrinary HealthVitamin CVitamin DVitamins A, E & KWeight ManagementZinc
Top ratedBest value

Highest score first

49L-Lysine80/100NOWL-Lysinepowder · 822 servings · $0.02/servingBuy on iHerb · $15.92
50L-Ornithine80/100NOW SportsL-Ornithinepowder · 227 servings · $0.13/servingBuy on iHerb · $29.39
51Taurine Powder80/100NOWTaurine Powderpowder · 227 servings · $0.05/servingBuy on iHerb · $11.01
52L-Tryptophan Powder80/100NOWL-Tryptophan Powderpowder · 57 servings · $0.39/servingBuy on iHerb · $22.03
53L-Tyrosine80/100NOWL-Tyrosinepowder · 283 servings · $0.06/servingBuy on iHerb · $18.36
545-HTP (5-Hydroxytryptophan) 100 mg80/100Protocol For Life Balance5-HTP (5-Hydroxytryptophan) 100 mgcapsule · 30 servings · $1.00/servingBuy on iHerb · $30.00
55L-Glutamine Powder80/100Thorne ResearchL-Glutamine Powderpowder · 89 servings · $0.75/servingBuy on iHerb · $67.00
56PharmaGABA-10080/100Thorne ResearchPharmaGABA-100capsule · 30 servings · $1.13/servingBuy on iHerb · $34.00
57PharmaGABA-25080/100Thorne ResearchPharmaGABA-250capsule · 30 servings · $1.97/servingBuy on iHerb · $59.00
58100% Pure L-Methionine 500 mg80/100Swanson Premium Brand100% Pure L-Methionine 500 mgcapsule · 30 servings · $0.15/servingBuy on iHerb · $4.50
595-HTP 50 mg80/100Swanson Premium Brand5-HTP 50 mgcapsule · 30 servings · $0.31/servingBuy on iHerb · $9.19
60GABAplex With L-Tyrosine & L-Theanine80/100Swanson UltraGABAplex With L-Tyrosine & L-Theaninecapsule · 30 servings · $0.56/servingBuy on iHerb · $16.79
61Pharmaceutical Grade AjiPure L-Methionine 500 mg80/100Swanson UltraPharmaceutical Grade AjiPure L-Methionine 500 mgcapsule · 30 servings · $0.39/servingBuy on iHerb · $11.76
62Taurine 500 mg80/100Swanson Premium BrandTaurine 500 mgcapsule · 30 servings · $0.28/servingBuy on iHerb · $8.39
63Pharmaceutical Grade AjiPure L-Glutamine Powder80/100Swanson UltraPharmaceutical Grade AjiPure L-Glutamine Powderpowder · 68 servings · $0.36/servingBuy on iHerb · $24.79
64L-Ornithine Amino Acid 500 mg80/100Swanson Premium BrandL-Ornithine Amino Acid 500 mgcapsule · 30 servings · $0.31/servingBuy on iHerb · $9.23
65Pharmaceutical Grade AjiPure Glycine80/100Swanson UltraPharmaceutical Grade AjiPure Glycinepowder · 227 servings · $0.07/servingBuy on iHerb · $16.69
66L-Tryptophan 500 mg80/100Swanson Premium BrandL-Tryptophan 500 mgcapsule · 30 servings · $0.46/servingBuy on iHerb · $13.69
67Micronized L-Glutamine 5000 mg Powder80/100Natural FactorsMicronized L-Glutamine 5000 mg Powderpowder · 45 servings · $0.40/servingBuy on iHerb · $17.99
68Glutamine Pure Powder 5,000 mg (5 g)80/100Country LifeGlutamine Pure Powder 5,000 mg (5 g)powder · 55 servings · $0.38/servingBuy on iHerb · $20.89
69BCAAs80/100BluebonnetBCAAscapsule · 30 servings · $1.13/servingBuy on iHerb · $34.00
70L-Arginine AKG80/100BodyTechL-Arginine AKGpowder · 30 servings · $0.67/servingBuy on iHerb · $19.99
71L-Tryptophan 500 mg80/100Swanson UltraL-Tryptophan 500 mgcapsule · 30 servings · $1.02/servingBuy on iHerb · $30.65
72AjiPure L-Leucine 500 mg80/100Swanson UltraAjiPure L-Leucine 500 mgcapsule · 30 servings · $0.31/servingBuy on iHerb · $9.23

Scores rate what's on the label (dosage transparency, cleanliness, ingredient profile), not clinical results. Prices come from the iHerb catalog feed and can change at checkout. See the full Best Amino Acids ranking.