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

169L-Arginine Pure Powder80/100Best NaturalsL-Arginine Pure Powderpowder · 98 servings · $0.16/servingBuy on iHerb · $16.16
1705-HTP 200mg80/100Best Naturals5-HTP 200mgcapsule · 120 servings · $0.14/servingBuy on iHerb · $17.20
171L-Carnosine 500 mg80/100Advance Physician FormulasL-Carnosine 500 mgcapsule · 30 servings · $0.45/servingBuy on iHerb · $13.51
172L-Theanine 200 mg80/100Advance Physician FormulasL-Theanine 200 mgcapsule · 60 servings · $0.16/servingBuy on iHerb · $9.85
173L-Proline 2,000 mg80/100NutricostL-Proline 2,000 mgpowder · 125 servings · $0.14/servingBuy on iHerb · $17.95
174L-Serine 2,000 mg80/100NutricostL-Serine 2,000 mgpowder · 113 servings · $0.21/servingBuy on iHerb · $23.95
175L-Glutamine Pure Powder80/100Best NaturalsL-Glutamine Pure Powderpowder · 90 servings · $0.27/servingBuy on iHerb · $24.55
176Instantized BCAA Unflavored80/100Lake Avenue NutritionInstantized BCAA Unflavoredpowder · 171 servings · $0.15/servingBuy on iHerb · $26.30
177L-Glutamine80/100Source NaturalsL-Glutaminepowder · 50 servings · $0.20/servingBuy on iHerb · $10.05
178L-Serine 900 mg80/100Lake Avenue NutritionL-Serine 900 mgcapsule · 120 servings · $0.10/servingBuy on iHerb · $11.61
179Taurine Powder80/100Source NaturalsTaurine Powderpowder · 148 servings · $0.05/servingBuy on iHerb · $7.09
1805-HTP 100 mg80/100California Gold Nutrition5-HTP 100 mgcapsule · 90 servings · $0.25/servingBuy on iHerb · $22.06
181L-Proline Powder80/100Source NaturalsL-Proline Powderpowder · 56 servings · $0.18/servingBuy on iHerb · $10.03
182GABA Powder80/100Source Naturals Serene ScienceGABA Powderpowder · 296 servings · $0.05/servingBuy on iHerb · $16.09
183Glycine 500 mg80/100Metabolic MaintenanceGlycine 500 mgtablet · 90 servings · $0.53/servingBuy on iHerb · $48.00
184NAC 600 mg80/100Metabolic MaintenanceNAC 600 mgcapsule · 60 servings · $0.56/servingBuy on iHerb · $33.60
185L-Glutamine80/100California Gold Nutrition SPORTL-Glutaminepowder · 91 servings · $0.25/servingBuy on iHerb · $22.41
186N-Acetyl-L-Cysteine 900 mg80/100Douglas LaboratoriesN-Acetyl-L-Cysteine 900 mgcapsule · 90 servings · $0.64/servingBuy on iHerb · $57.23
187L-Lysine Powder80/100Source NaturalsL-Lysine Powderpowder · 60 servings · $0.09/servingBuy on iHerb · $5.29
188L-Methionine80/100Source NaturalsL-Methioninepowder · 66 servings · $0.24/servingBuy on iHerb · $15.93
189L-Ornithine Powder80/100Source NaturalsL-Ornithine Powderpowder · 52 servings · $0.34/servingBuy on iHerb · $17.46
190L-Tyrosine Powder80/100Source NaturalsL-Tyrosine Powderpowder · 149 servings · $0.10/servingBuy on iHerb · $15.32
191NAC 600 mg80/100NutraBioNAC 600 mgcapsule · 90 servings · $0.23/servingBuy on iHerb · $20.99
1925-HTP80/100NOW5-HTPcapsule · 30 servings · $0.37/servingBuy on iHerb · $11.01

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.