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

553EAA200072/100Evlution NutritionEAA2000capsule · 30 servings · $0.35/servingBuy on iHerb · $10.50
554Micronized L-Glutamine 1000 mg72/100Natural FactorsMicronized L-Glutamine 1000 mgcapsule · 30 servings · $0.49/servingBuy on iHerb · $14.67
555Acetyl-L-Carnitine72/100Doctor's BestAcetyl-L-Carnitinecapsule · 60 servings · $0.38/servingBuy on iHerb · $22.99
556Best Acetyl-L-Carnitine HCl72/100Doctor's BestBest Acetyl-L-Carnitine HClcapsule · 60 servings · $0.25/servingBuy on iHerb · $14.99
557Extra Strength L-Glutamine 1000 mg72/100Protocol For Life BalanceExtra Strength L-Glutamine 1000 mgcapsule · 30 servings · $0.90/servingBuy on iHerb · $27.00
558Best Acetyl-L-Carnitine HCl Featuring Sigma Tau Carnitine71/100Doctor's BestBest Acetyl-L-Carnitine HCl Featuring Sigma Tau Carnitinecapsule · 120 servings · $0.19/servingBuy on iHerb · $22.99
5595-HTP TR Time Release 100 mg71/100Natrol5-HTP TR Time Release 100 mgtablet · 30 servings · $0.59/servingBuy on iHerb · $17.84
5605-HTP 200 mg TR Time Release71/100Natrol5-HTP 200 mg TR Time Releasetablet · 30 servings · $0.72/servingBuy on iHerb · $21.66
561L-Glutamine 1000 mg71/100NOW SportsL-Glutamine 1000 mgcapsule · 30 servings · $0.55/servingBuy on iHerb · $16.39
562L-Glutamine 1000 mg71/100Protocol For Life BalanceL-Glutamine 1000 mgcapsule · 24 servings · $1.13/servingBuy on iHerb · $27.00
563Arginine Citrulline71/100Michael's Naturopathic ProgramsArginine Citrullinetablet · 15 servings · $1.23/servingBuy on iHerb · $18.39
564Arginine Complex71/100Michael's Naturopathic ProgramsArginine Complextablet · 30 servings · $0.95/servingBuy on iHerb · $28.38
565Pharmaceutical Grade AjiPure L-Arginine 1,000 mg71/100Swanson UltraPharmaceutical Grade AjiPure L-Arginine 1,000 mgtablet · 30 servings · $1.02/servingBuy on iHerb · $30.54
5665-Hydroxytryptophan71/100Thorne5-Hydroxytryptophancapsule · 45 servings · $0.87/servingBuy on iHerb · $39.00
567NAC N-Acetyl-L-Cysteine71/100Allergy Research GroupNAC N-Acetyl-L-Cysteinetablet · 120 servings · $0.36/servingBuy on iHerb · $43.04
568Arginine Citrulline71/100MNP Michael's Naturopathic ProgramsArginine Citrullinetablet · 15 servings · $1.23/servingBuy on iHerb · $18.39
569AminoMax 800071/100Gaspari NutritionAminoMax 8000tablet · 82 servings · $0.44/servingBuy on iHerb · $36.23
570Best Acetyl-L-Carnitine71/100Doctor's BestBest Acetyl-L-Carnitinecapsule · 60 servings · $0.25/servingBuy on iHerb · $14.99
571L-Theanine & Caffeine71/100SR Sports ResearchL-Theanine & Caffeinesoftgel · 60 servings · $0.38/servingBuy on iHerb · $22.97
5725-HTP Plus 200 mg71/100Dr. Emil Nutrition5-HTP Plus 200 mgcapsule · 30 servings · $0.83/servingBuy on iHerb · $24.87
573N-Acetyl L-Tyrosine 300 mg71/100Source NaturalsN-Acetyl L-Tyrosine 300 mgtablet · 120 servings · $0.18/servingBuy on iHerb · $22.09
574Arginine Citrulline71/100MH Michael's Health Naturopathic ProgramsArginine Citrullinetablet · 15 servings · $1.23/servingBuy on iHerb · $18.39
575SAMe 200 mg71/100SwansonSAMe 200 mgtablet · 30 servings · $0.94/servingBuy on iHerb · $28.22
576L-Theanine + Caffeine71/100Sports ResearchL-Theanine + Caffeinesoftgel · 60 servings · $0.38/servingBuy on iHerb · $22.97

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.