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

337SAMe 400 mg77/100Jarrow FormulasSAMe 400 mgtablet · 30 servings · $1.50/servingBuy on iHerb · $44.96
338Theanine 100 mg77/100Jarrow FormulasTheanine 100 mgcapsule · 60 servings · $0.26/servingBuy on iHerb · $15.59
339Theanine 200 mg77/100Jarrow FormulasTheanine 200 mgcapsule · 60 servings · $0.44/servingBuy on iHerb · $26.60
340N-Acetyl Cysteine 600 mg77/100SwansonN-Acetyl Cysteine 600 mgcapsule · 30 servings · $0.72/servingBuy on iHerb · $21.59
341GABA 500 mg77/100SwansonGABA 500 mgcapsule · 30 servings · $0.37/servingBuy on iHerb · $11.09
342L-Arginine 500 mg77/100SwansonL-Arginine 500 mgcapsule · 30 servings · $0.48/servingBuy on iHerb · $14.29
343L-Tryptophan 500 mg77/100SwansonL-Tryptophan 500 mgcapsule · 30 servings · $0.46/servingBuy on iHerb · $13.69
3445-HTP 200 mg Maximum Strength77/100Swanson5-HTP 200 mg Maximum Strengthcapsule · 30 servings · $0.56/servingBuy on iHerb · $16.79
345Chewable 5-HTP 100 mg Natural Citrus Flavor77/100NOWChewable 5-HTP 100 mg Natural Citrus Flavorchewable · 30 servings · $0.57/servingBuy on iHerb · $17.13
346L-Citrulline 1200 mg77/100NOW SportsL-Citrulline 1200 mgtablet · 30 servings · $0.82/servingBuy on iHerb · $24.49
347SAMe 200 mg77/100Swanson UltraSAMe 200 mgtablet · 30 servings · $0.94/servingBuy on iHerb · $28.22
348High-Potency SAMe 400 mg77/100Swanson UltraHigh-Potency SAMe 400 mgtablet · 30 servings · $1.03/servingBuy on iHerb · $30.99
349L-Glutamine 500 mg77/100Life ExtensionL-Glutamine 500 mgcapsule · 30 servings · $0.38/servingBuy on iHerb · $11.25
350L-Carnitine 500 mg77/100Life ExtensionL-Carnitine 500 mgcapsule · 30 servings · $0.38/servingBuy on iHerb · $11.25
351L-Arginine Extra Strength77/100Havasu NutritionL-Arginine Extra Strengthcapsule · 30 servings · $0.83/servingBuy on iHerb · $24.99
352L-Tryptophan 500 mg77/100Life ExtensionL-Tryptophan 500 mgcapsule · 30 servings · $0.82/servingBuy on iHerb · $24.75
353Taurine 1000 mg77/100Life ExtensionTaurine 1000 mgcapsule · 30 servings · $0.33/servingBuy on iHerb · $9.75
354SAMe 40077/100Jarrow FormulasSAMe 400tablet · 30 servings · $1.50/servingBuy on iHerb · $44.96
355L-Theanine 100 mg77/100NOWL-Theanine 100 mgcapsule · 30 servings · $0.38/servingBuy on iHerb · $11.43
356Double Strength L-Theanine 200 mg77/100NOWDouble Strength L-Theanine 200 mgcapsule · 30 servings · $0.53/servingBuy on iHerb · $15.79
357L-Arginine 700 mg77/100NOWL-Arginine 700 mgcapsule · 180 servings · $0.11/servingBuy on iHerb · $20.20
358GABA 250 mg77/100Nature's WayGABA 250 mgcapsule · 60 servings · $0.21/servingBuy on iHerb · $12.56
359Mega-Size BCAA 1000 Caps77/100Optimum NutritionMega-Size BCAA 1000 Capscapsule · 100 servings · $0.25/servingBuy on iHerb · $24.70
360Arginine AKG 1 gram77/100SwansonArginine AKG 1 gramcapsule · 90 servings · $0.18/servingBuy on iHerb · $15.89

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.