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

15-HTP 200 mg90/100NOW5-HTP 200 mgcapsule · 30 servings · $0.60/servingBuy on iHerb · $17.86
25 - HTP 200 mg90/100Protocol For Life Balance5 - HTP 200 mgcapsule · 30 servings · $1.07/servingBuy on iHerb · $32.00
35-HTP (5-Hydroxytryptophan) 200 mg90/100Protocol For Life Balance5-HTP (5-Hydroxytryptophan) 200 mgcapsule · 60 servings · $0.53/servingBuy on iHerb · $32.00
4BCAA & Glutamine89/100BodyTechBCAA & Glutaminepowder · 30 servings · $0.83/servingBuy on iHerb · $24.99
5NAC Detox Regulators88/100Doctor's BestNAC Detox Regulatorscapsule · 60 servings · $0.17/servingBuy on iHerb · $9.99
6Best NAC Detox Regulators88/100Doctor's BestBest NAC Detox Regulatorscapsule · 60 servings · $0.17/servingBuy on iHerb · $9.99
7GABA 500 mg86/100NutricostGABA 500 mgcapsule · 240 servings · $0.07/servingBuy on iHerb · $16.95
8L-Carnitine Liquid 1000 mg Citrus Flavor85/100NOW SportsL-Carnitine Liquid 1000 mg Citrus Flavorliquid · 32 servings · $0.50/servingBuy on iHerb · $15.92
9L-Theanine 100 mg Smooth Melts85/100Country LifeL-Theanine 100 mg Smooth Meltslozenge · 30 servings · $0.82/servingBuy on iHerb · $24.69
10Liquid L-Carnitine 1000 mg Citrus Flavor85/100NOW SportsLiquid L-Carnitine 1000 mg Citrus Flavorliquid · 32 servings · $0.50/servingBuy on iHerb · $15.92
11NAC 1,000 mg Quercetin 500 mg & Zinc 15 mg85/100NOWNAC 1,000 mg Quercetin 500 mg & Zinc 15 mgcapsule · 45 servings · $0.54/servingBuy on iHerb · $24.49
12L-Theanine 100 mg Mint Flavored85/100Country LifeL-Theanine 100 mg Mint Flavoredchewable · 30 servings · $0.82/servingBuy on iHerb · $24.69
13GABA 500 mg83/100NOWGABA 500 mgcapsule · 30 servings · $0.54/servingBuy on iHerb · $16.10
14L-Carnitine Liquid 1000 mg Tropical Punch Flavor83/100NOW SportsL-Carnitine Liquid 1000 mg Tropical Punch Flavorliquid · 32 servings · $0.50/servingBuy on iHerb · $15.92
15Double Strength 5-HTP 200 mg83/100NOWDouble Strength 5-HTP 200 mgcapsule · 30 servings · $0.97/servingBuy on iHerb · $29.20
16L-Methionine 500 mg83/100NOWL-Methionine 500 mgcapsule · 50 servings · $0.29/servingBuy on iHerb · $14.68
17Double Potency Suntheanine L-Theanine 200 mg83/100Swanson UltraDouble Potency Suntheanine L-Theanine 200 mgcapsule · 30 servings · $0.88/servingBuy on iHerb · $26.25
18Cognitive Aminos83/100Pure EncapsulationsCognitive Aminoscapsule · 60 servings · $0.98/servingBuy on iHerb · $59.00
19Carnipure 3000 Candy Punch83/100BodyTechCarnipure 3000 Candy Punchpowder · 45 servings · $0.67/servingBuy on iHerb · $29.99
20Carnipure 3000 Peach Mango83/100BodyTechCarnipure 3000 Peach Mangopowder · 45 servings · $0.67/servingBuy on iHerb · $29.99
21Suntheanine L-Theanine 150 mg83/100Doctor's BestSuntheanine L-Theanine 150 mgcapsule · 90 servings · $0.24/servingBuy on iHerb · $21.99
22L-Carnitine + Tartrate83/100ALLMAXL-Carnitine + Tartratecapsule · 60 servings · $0.42/servingBuy on iHerb · $24.99
23L-Theanine 200 mg83/100Metabolic MaintenanceL-Theanine 200 mgcapsule · 120 servings · $0.60/servingBuy on iHerb · $72.10
24L-Theanine 200 mg83/100Sports ResearchL-Theanine 200 mgsoftgel · 60 servings · $0.35/servingBuy on iHerb · $20.97

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.