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Cheapest Tryptophan on iHerb

Ranked by real cost per 10 mg of Tryptophan — cheapest value first.

Prices updated Jul 25, 2026 · 25 products · Prices in USD

The priciest option here costs about 4.5× more per 10 mg of Tryptophan than the best-value pick Designer Wellness. For the same daily dose, choosing by cost per unit instead of sticker price can meaningfully cut your yearly spend.
#ProductDoseServingsPrice (USD)Cost per 10 mg
1
Designer Wellness, Designer Whey, Natural 100% Whey Protein Powder, Gourmet Chocolate, 12 oz (340 g)
Designer Wellness, Designer Whey, Natural 100% Whey Protein Powder, Gourmet Chocolate, 12 oz (340 g)
Designer Wellness
2,000 mg1122.990.011View on iHerb →
2
BSN, AminoX, EAAs, Muscle Support & Recovery, Watermelon Smash, 13.2 oz (375 g)
BSN, AminoX, EAAs, Muscle Support & Recovery, Watermelon Smash, 13.2 oz (375 g)
BSN
400 mg2523.010.023View on iHerb →
3
BSN, AminoX®, EAAs, Strawberry Dragon Fruit, 13.2 oz (375 g)
BSN, AminoX®, EAAs, Strawberry Dragon Fruit, 13.2 oz (375 g)
BSN
400 mg2523.010.023View on iHerb →
4
NutriBiotic, Rice Protein Powder, Vanilla, 3 lb (1.36 kg)
NutriBiotic, Rice Protein Powder, Vanilla, 3 lb (1.36 kg)
NutriBiotic
160 mg9038.610.027View on iHerb →
5
BPI Sports, ISO HD™, 100% Pure Isolate Protein, Vanilla Cookie, 4.8 lbs (2,170 g)
BPI Sports, ISO HD™, 100% Pure Isolate Protein, Vanilla Cookie, 4.8 lbs (2,170 g)
BPI Sports
419 mg7081.600.028View on iHerb →
6
Levels, Grass Fed Whey Protein Powder, Vanilla Cinnamon, 5 lb (2.27 kg)
Levels, Grass Fed Whey Protein Powder, Vanilla Cinnamon, 5 lb (2.27 kg)
Levels
430 mg7189.990.030View on iHerb →
7
Levels, Grass Fed Whey Protein Powder, Cappuccino, 5 lb (2.27 kg)
Levels, Grass Fed Whey Protein Powder, Cappuccino, 5 lb (2.27 kg)
Levels
420 mg7189.990.030View on iHerb →
8
Levels, Grass Fed Whey Protein Powder, Double Chocolate, 5 lbs (2.27 kg)
Levels, Grass Fed Whey Protein Powder, Double Chocolate, 5 lbs (2.27 kg)
Levels
420 mg7189.990.030View on iHerb →
9
NutriBiotic, Rice Protein Powder, Chocolate, 3 lb (1.36 kg)
NutriBiotic, Rice Protein Powder, Chocolate, 3 lb (1.36 kg)
NutriBiotic
147 mg8538.610.031View on iHerb →
10
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Cinnamon Cereal, 4.8 lbs (2,176 g)
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Cinnamon Cereal, 4.8 lbs (2,176 g)
BPI Sports
417 mg6889.950.032View on iHerb →
11
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Vanilla Ice Cream, 4.8 lbs (2,176 g)
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Vanilla Ice Cream, 4.8 lbs (2,176 g)
BPI Sports
417 mg6889.950.032View on iHerb →
12
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Fruity Loopers, 4.8 lbs (2,176 g)
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Fruity Loopers, 4.8 lbs (2,176 g)
BPI Sports
417 mg6889.950.032View on iHerb →
13
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Strawberry Creme, 4 lb (1,820 g)
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Strawberry Creme, 4 lb (1,820 g)
Metabolic Nutrition
531 mg5289.990.033View on iHerb →
14
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Peanut Butter Cookie, 2 lb (910 g)
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Peanut Butter Cookie, 2 lb (910 g)
Metabolic Nutrition
531 mg2649.990.036View on iHerb →
15
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Banana Creme, 2 lb (910 g)
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Banana Creme, 2 lb (910 g)
Metabolic Nutrition
531 mg2649.990.036View on iHerb →
16
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Strawberry Creme, 2 lb (910 g)
Metabolic Nutrition, Protizyme, Specialized Designed Protein, Strawberry Creme, 2 lb (910 g)
Metabolic Nutrition
531 mg2649.990.036View on iHerb →
17
NutraBio, Classic Whey Protein, Orange Dream, 2 lb (907 g)
NutraBio, Classic Whey Protein, Orange Dream, 2 lb (907 g)
NutraBio
525 mg2649.990.037View on iHerb →
18
NutraBio, Classic Whey Protein, Pistachio Delight, 2 lb (907 g)
NutraBio, Classic Whey Protein, Pistachio Delight, 2 lb (907 g)
NutraBio
525 mg2649.990.037View on iHerb →
19
EHPlabs, OxyWhey, Lean Wellness Protein, Choc Caramel, 2.03 lb (922 g)
EHPlabs, OxyWhey, Lean Wellness Protein, Choc Caramel, 2.03 lb (922 g)
EHPlabs
449 mg2744.950.037View on iHerb →
20
Levels, Grass Fed Whey Protein Powder, Vanilla Cinnamon, 2 lb (907 g)
Levels, Grass Fed Whey Protein Powder, Vanilla Cinnamon, 2 lb (907 g)
Levels
430 mg2844.990.037View on iHerb →
21
Levels, Grass Fed Whey Protein Powder, Vanilla Bean, 2 lb (907 g)
Levels, Grass Fed Whey Protein Powder, Vanilla Bean, 2 lb (907 g)
Levels
410 mg2844.990.039View on iHerb →
22
Levels, Grass Fed Whey Protein Powder, Chocolate Peanut Butter, 2 lb (907 g)
Levels, Grass Fed Whey Protein Powder, Chocolate Peanut Butter, 2 lb (907 g)
Levels
410 mg2644.990.042View on iHerb →
23
Paradise Herbs, Whey Protein, Natural Vanilla, 32 oz (990 g)
Paradise Herbs, Whey Protein, Natural Vanilla, 32 oz (990 g)
Paradise Herbs
377 mg3049.990.044View on iHerb →
24
Paradise Herbs, Whey Protein, Natural Chocolate, 32 oz (990 g)
Paradise Herbs, Whey Protein, Natural Chocolate, 32 oz (990 g)
Paradise Herbs
377 mg3049.990.044View on iHerb →
25
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Cinnamon Cereal, 1.62 lbs (736 g)
BPI Sports, Hydro HD™, Hydrolyzed Whey Protein, Cinnamon Cereal, 1.62 lbs (736 g)
BPI Sports
417 mg2344.950.047View on iHerb →

How we rank Tryptophan

Two supplements can list the same dose per serving yet cost very differently once you account for how many servings are in the bottle. We calculate the total nutrient in each container (dose per serving × servings per container), divide the current price by that total, and rank by the resulting cost per unit. Lower is better. Because prices are refreshed automatically, this ranking reflects today's iHerb pricing rather than a snapshot from months ago.

Cost per unit is a starting point, not the whole story — the ideal form, third-party testing, and other ingredients matter too. Always check the label and consult a healthcare professional before starting a supplement.

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Prices update automatically and may differ from iHerb at checkout. Rankings are based on cost per unit of the listed nutrient and are for informational purposes only — not medical advice. Links to iHerb are affiliate links.