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

529NAC N-Acetyl Cysteine 750 mg72/100Country LifeNAC N-Acetyl Cysteine 750 mgcapsule · 30 servings · $0.51/servingBuy on iHerb · $15.19
5305HTP 50 mg72/100Vital Nutrients5HTP 50 mgcapsule · 30 servings · $1.23/servingBuy on iHerb · $36.99
5315HTP 100 mg72/100Vital Nutrients5HTP 100 mgcapsule · 60 servings · $0.85/servingBuy on iHerb · $50.99
532BCAA 600072/100Gaspari NutritionBCAA 6000tablet · 30 servings · $1.21/servingBuy on iHerb · $36.23
533Arginine & Citrulline 500/25072/100NOW SportsArginine & Citrulline 500/250capsule · 30 servings · $1.02/servingBuy on iHerb · $30.61
534Arginine & Citrulline 500 mg/250 mg72/100NOW SportsArginine & Citrulline 500 mg/250 mgcapsule · 30 servings · $0.55/servingBuy on iHerb · $16.52
535Arginine & Citrulline 500 mg / 250 mg72/100NOW SportsArginine & Citrulline 500 mg / 250 mgcapsule · 30 servings · $1.02/servingBuy on iHerb · $30.61
536D-Ribose 2800 mg72/100NutricostD-Ribose 2800 mgcapsule · 60 servings · $0.33/servingBuy on iHerb · $19.95
537L-Tryptophan 1,000 mg72/100AN Amazing Nutrition Amazing FormulasL-Tryptophan 1,000 mgtablet · 120 servings · $0.18/servingBuy on iHerb · $21.99
538DMG 500 mg72/100Advanced Nutrition by ZahlerDMG 500 mgtablet · 90 servings · $0.46/servingBuy on iHerb · $41.57
539L-Lysine 1,000 mg72/100Source NaturalsL-Lysine 1,000 mgtablet · 100 servings · $0.10/servingBuy on iHerb · $9.66
540GABA 750 mg72/100Source Naturals Serene ScienceGABA 750 mgtablet · 180 servings · $0.13/servingBuy on iHerb · $22.75
541SAMe 400 mg72/100Lake Avenue NutritionSAMe 400 mgtablet · 60 servings · $0.80/servingBuy on iHerb · $47.94
542N-Acetyl Cysteine 600 mg72/100Source NaturalsN-Acetyl Cysteine 600 mgtablet · 120 servings · $0.17/servingBuy on iHerb · $20.11
543Taurine 500 mg72/100Source NaturalsTaurine 500 mgtablet · 120 servings · $0.08/servingBuy on iHerb · $9.17
544L-Arginine L-Citrulline Complex72/100Source NaturalsL-Arginine L-Citrulline Complextablet · 120 servings · $0.15/servingBuy on iHerb · $18.19
545L-Citrulline 1000 mg72/100Source NaturalsL-Citrulline 1000 mgtablet · 30 servings · $0.68/servingBuy on iHerb · $20.29
546L-Arginine L-Citrulline Complex 1,000 mg72/100Source NaturalsL-Arginine L-Citrulline Complex 1,000 mgtablet · 30 servings · $1.03/servingBuy on iHerb · $30.79
547L-Citrulline 2000 mg72/100Best NaturalsL-Citrulline 2000 mgtablet · 60 servings · $0.21/servingBuy on iHerb · $12.90
548Mega Strength L-Arginine 500 mg72/100Nature's TruthMega Strength L-Arginine 500 mgcapsule · 50 servings · $0.20/servingBuy on iHerb · $10.09
549Maximum Strength L-Arginine HCl 1,000 mg72/100Nature's TruthMaximum Strength L-Arginine HCl 1,000 mgtablet · 50 servings · $0.19/servingBuy on iHerb · $9.26
550Mega Strength L-Carnitine 1,000 mg72/100Nature's TruthMega Strength L-Carnitine 1,000 mgcapsule · 30 servings · $0.46/servingBuy on iHerb · $13.93
551Super Strength Acetyl L-Carnitine HCl 1,000 mg72/100Nature's TruthSuper Strength Acetyl L-Carnitine HCl 1,000 mgcapsule · 30 servings · $0.33/servingBuy on iHerb · $9.89
552L-Lysine 1,000 mg72/100Nature's TruthL-Lysine 1,000 mgtablet · 100 servings · $0.10/servingBuy on iHerb · $9.55

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.