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

265NAC78/100ThorneNACcapsule · 30 servings · $1.10/servingBuy on iHerb · $33.00
266Taurine 1000 mg78/100Jarrow FormulasTaurine 1000 mgcapsule · 100 servings · $0.13/servingBuy on iHerb · $12.83
267Arginine & Ornithine 500 mg / 250 mg78/100NOW SportsArginine & Ornithine 500 mg / 250 mgcapsule · 50 servings · $0.24/servingBuy on iHerb · $12.24
268Acetyl L-Carnitine 500 mg78/100CarlsonAcetyl L-Carnitine 500 mgcapsule · 60 servings · $0.34/servingBuy on iHerb · $20.32
269N-A-C 500 mg78/100CarlsonN-A-C 500 mgcapsule · 60 servings · $0.28/servingBuy on iHerb · $16.58
270L-Carnosine 500 mg78/100NutricostL-Carnosine 500 mgcapsule · 120 servings · $0.32/servingBuy on iHerb · $37.80
271DL-Phenylalanine78/100DaVinci Laboratories Of VermontDL-Phenylalaninecapsule · 60 servings · $0.46/servingBuy on iHerb · $27.57
272N-Acetyl-L-Cysteine 600 mg78/100Life ExtensionN-Acetyl-L-Cysteine 600 mgcapsule · 30 servings · $0.40/servingBuy on iHerb · $12.00
273Alpha Ketoglutaric Acid 300 mg78/100KirkmanAlpha Ketoglutaric Acid 300 mgcapsule · 100 servings · $0.30/servingBuy on iHerb · $30.39
274L-Theanine78/100Integrative TherapeuticsL-Theaninecapsule · 30 servings · $0.73/servingBuy on iHerb · $22.00
275DLPA DL-Phenylalanine 500 mg78/100CarlsonDLPA DL-Phenylalanine 500 mgcapsule · 60 servings · $0.20/servingBuy on iHerb · $12.27
276L-Glutamine 750 mg78/100CarlsonL-Glutamine 750 mgcapsule · 300 servings · $0.17/servingBuy on iHerb · $52.28
277GABA 250 mg78/100KirkmanGABA 250 mgcapsule · 120 servings · $0.27/servingBuy on iHerb · $32.45
278L-Carnosine 200 mg78/100KirkmanL-Carnosine 200 mgcapsule · 90 servings · $0.51/servingBuy on iHerb · $45.84
279L-Theanine78/100Enzymatic TherapyL-Theaninecapsule · 30 servings · $0.46/servingBuy on iHerb · $13.82
280TMG 500 mg78/100KirkmanTMG 500 mgcapsule · 120 servings · $0.32/servingBuy on iHerb · $37.85
281L-Arginine 1,000 mg78/100NutricostL-Arginine 1,000 mgtablet · 300 servings · $0.09/servingBuy on iHerb · $25.95
282L-Lysine 500 mg78/100Source NaturalsL-Lysine 500 mgcapsule · 200 servings · $0.07/servingBuy on iHerb · $13.80
283L-Theanine 100 mg78/100California Gold NutritionL-Theanine 100 mgcapsule · 30 servings · $0.21/servingBuy on iHerb · $6.36
284L-Theanine 200 mg78/100California Gold NutritionL-Theanine 200 mgcapsule · 60 servings · $0.18/servingBuy on iHerb · $11.07
285TheanineUP Focused Energy78/100California Gold NutritionTheanineUP Focused Energycapsule · 60 servings · $0.21/servingBuy on iHerb · $12.60
286Acetyl-L-Carnitine 500 mg78/100ThorneAcetyl-L-Carnitine 500 mgcapsule · 60 servings · $0.53/servingBuy on iHerb · $32.00
287Lysine 500 mg78/100ThorneLysine 500 mgcapsule · 60 servings · $0.25/servingBuy on iHerb · $15.00
288L-Arginine78/100ThorneL-Argininecapsule · 60 servings · $0.73/servingBuy on iHerb · $44.00

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.