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

97L-Theanine 150 mg80/100SolgarL-Theanine 150 mgcapsule · 30 servings · $0.85/servingBuy on iHerb · $25.49
98Taurine Free Form Amino Acid80/100Allergy Research GroupTaurine Free Form Amino Acidcapsule · 50 servings · $0.36/servingBuy on iHerb · $18.19
995-HTP 100 mg80/100Doctor's Best5-HTP 100 mgcapsule · 60 servings · $0.17/servingBuy on iHerb · $9.99
100Pure L-Arginine Powder80/100Doctor's BestPure L-Arginine Powderpowder · 50 servings · $0.38/servingBuy on iHerb · $18.99
101Pure L-Glutamine Powder80/100Doctor's BestPure L-Glutamine Powderpowder · 60 servings · $0.32/servingBuy on iHerb · $18.99
1025-HTP 100 mg Extra Strength80/100Swanson5-HTP 100 mg Extra Strengthcapsule · 30 servings · $0.28/servingBuy on iHerb · $8.49
103GABAplex80/100SwansonGABAplexcapsule · 30 servings · $0.56/servingBuy on iHerb · $16.79
104L-Lysine80/100Allergy Research GroupL-Lysinecapsule · 50 servings · $0.34/servingBuy on iHerb · $17.19
105Arginine & Citrulline Powder80/100NOW SportsArginine & Citrulline Powderpowder · 113 servings · $0.22/servingBuy on iHerb · $24.49
106Acetyl-L-Carnitine Pure Powder80/100NOWAcetyl-L-Carnitine Pure Powderpowder · 57 servings · $0.32/servingBuy on iHerb · $18.36
107L-Leucine Powder80/100NOW SportsL-Leucine Powderpowder · 51 servings · $0.58/servingBuy on iHerb · $29.39
108L-Carnitine 3000 Candy Punch80/100BodyTechL-Carnitine 3000 Candy Punchpowder · 45 servings · $0.67/servingBuy on iHerb · $29.99
109L-Carnitine 3000 Peach Mango80/100BodyTechL-Carnitine 3000 Peach Mangopowder · 45 servings · $0.67/servingBuy on iHerb · $29.99
110NAC (N-Acetyl-l-Cysteine) 600 mg80/100Vital NutrientsNAC (N-Acetyl-l-Cysteine) 600 mgcapsule · 50 servings · $0.64/servingBuy on iHerb · $31.99
111Taurine Powder80/100CarlsonTaurine Powderpowder · 31 servings · $0.28/servingBuy on iHerb · $8.67
112L-Arginine Amino Acid Powder80/100CarlsonL-Arginine Amino Acid Powderpowder · 33 servings · $0.39/servingBuy on iHerb · $12.92
113Glycine80/100CarlsonGlycinepowder · 50 servings · $0.21/servingBuy on iHerb · $10.63
114L-Ornithine Powder80/100NOW SportsL-Ornithine Powderpowder · 227 servings · $0.13/servingBuy on iHerb · $29.39
115D, L-Phenylalanine 500 mg80/100Life ExtensionD, L-Phenylalanine 500 mgcapsule · 30 servings · $0.47/servingBuy on iHerb · $14.25
116100% Pure L-Theanine 200 mg80/100NutraBio100% Pure L-Theanine 200 mgcapsule · 90 servings · $0.26/servingBuy on iHerb · $22.99
117L-Citrulline80/100NutraBioL-Citrullinepowder · 75 servings · $0.32/servingBuy on iHerb · $23.99
118NAC80/100NutraBioNACpowder · 250 servings · $0.10/servingBuy on iHerb · $23.99
119100% Pure AAKG80/100NutraBio100% Pure AAKGpowder · 142 servings · $0.26/servingBuy on iHerb · $36.99
120Glutamine80/100NutraBioGlutaminepowder · 100 servings · $0.30/servingBuy on iHerb · $29.99

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.