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.

  • Doses, fillers and hidden blends checked
  • Today's price and cost per serving
  • One click to order on iHerb

We may earn a commission when you buy through these links, at no extra cost to you. It never changes a score or a ranking. See how we score

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

385NAC N-Acetyl-Cysteine 600 mg77/100Swanson Premium BrandNAC N-Acetyl-Cysteine 600 mgcapsule · 30 servings · $0.72/servingBuy on iHerb · $21.59
386N-Acetyl-L Cysteine 500 mg77/100Natural FactorsN-Acetyl-L Cysteine 500 mgcapsule · 30 servings · $0.48/servingBuy on iHerb · $14.39
3875-HTP 50 mg76/100Jarrow Formulas5-HTP 50 mgcapsule · 90 servings · $0.21/servingBuy on iHerb · $19.26
388L-Cysteine 500 mg76/100NOWL-Cysteine 500 mgtablet · 30 servings · $0.36/servingBuy on iHerb · $10.77
389Acetyl-L Carnitine 500 mg76/100Protocol For Life BalanceAcetyl-L Carnitine 500 mgcapsule · 30 servings · $1.12/servingBuy on iHerb · $33.60
390Chewable L-Lysine 600 mg Tangy Twist Chew76/100Country LifeChewable L-Lysine 600 mg Tangy Twist Chewchewable · 30 servings · $0.64/servingBuy on iHerb · $19.19
391L-Glutamine76/100Jarrow FormulasL-Glutaminetablet · 100 servings · $0.19/servingBuy on iHerb · $18.68
392Super Amino Night76/100Source NaturalsSuper Amino Nightcapsule · 30 servings · $0.58/servingBuy on iHerb · $17.26
393BCAA 6 g Peach Mango76/100Nutricost WomenBCAA 6 g Peach Mangopowder · 30 servings · $0.63/servingBuy on iHerb · $18.95
394BCAA 6 g Strawberry Lemonade76/100Nutricost WomenBCAA 6 g Strawberry Lemonadepowder · 30 servings · $0.63/servingBuy on iHerb · $18.95
395Chewable L-Lysine 600 mg Tangy Orange Twist Chew76/100Country LifeChewable L-Lysine 600 mg Tangy Orange Twist Chewchewable · 30 servings · $0.64/servingBuy on iHerb · $19.19
396DMG 125 mg N, N-Dimethyl Glycine75/100NOWDMG 125 mg N, N-Dimethyl Glycinecapsule · 30 servings · $0.35/servingBuy on iHerb · $10.40
397L-Arginine Amino Acid 500 mg75/100NOWL-Arginine Amino Acid 500 mgcapsule · 50 servings · $0.17/servingBuy on iHerb · $8.75
398Double Strength L-Arginine Amino Acid 1000 mg75/100NOWDouble Strength L-Arginine Amino Acid 1000 mgtablet · 30 servings · $0.58/servingBuy on iHerb · $17.40
399GABA 750 mg75/100NOWGABA 750 mgcapsule · 30 servings · $0.41/servingBuy on iHerb · $12.24
400Glycine 1000 mg75/100NOWGlycine 1000 mgcapsule · 30 servings · $0.39/servingBuy on iHerb · $11.62
401Acetyl L-Carnitine 500 mg75/100Source NaturalsAcetyl L-Carnitine 500 mgtablet · 30 servings · $0.79/servingBuy on iHerb · $23.83
402Acetyl L-Carnitine 500 mg75/100Vital NutrientsAcetyl L-Carnitine 500 mgcapsule · 20 servings · $1.80/servingBuy on iHerb · $35.99
403Serene Science 5-HTP 100 mg75/100Source NaturalsSerene Science 5-HTP 100 mgcapsule · 30 servings · $0.57/servingBuy on iHerb · $17.15
404L-Tyrosine 500 mg75/100Jarrow FormulasL-Tyrosine 500 mgcapsule · 100 servings · $0.15/servingBuy on iHerb · $14.67
405L-Arginine 500 mg75/100NOWL-Arginine 500 mgcapsule · 125 servings · $0.13/servingBuy on iHerb · $16.47
406Double Strength L-Arginine 1000 mg75/100NOWDouble Strength L-Arginine 1000 mgtablet · 30 servings · $0.58/servingBuy on iHerb · $17.40
407NAC 1000 mg75/100NOWNAC 1000 mgtablet · 30 servings · $0.65/servingBuy on iHerb · $19.39
408L-Citrulline 1000 mg75/100NutricostL-Citrulline 1000 mgcapsule · 60 servings · $0.22/servingBuy on iHerb · $12.95

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.