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Cheapest L-Tryptophan on iHerb

Ranked by real cost per 100 mg of L-Tryptophan — cheapest value first.

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

The priciest option here costs about 39.9× more per 100 mg of L-Tryptophan than the best-value pick Vitamatic. For the same daily dose, choosing by cost per unit instead of sticker price can meaningfully cut your yearly spend.
#ProductDoseServingsPrice (USD)Cost per 100 mg
1
Vitamatic, L-Tryptophan, 1,000 mg, 120 Tablets
Vitamatic, L-Tryptophan, 1,000 mg, 120 Tablets
Vitamatic
1,000 mg12014.990.013View on iHerb →
2
Amazing Nutrition, L-Tryptophan, 1,000 mg, 120 Tablets
Amazing Nutrition, L-Tryptophan, 1,000 mg, 120 Tablets
Amazing Nutrition
1,000 mg12021.990.018View on iHerb →
3
Amazing Nutrition, L-Tryptophan, 1,000 mg, 60 Tablets
Amazing Nutrition, L-Tryptophan, 1,000 mg, 60 Tablets
Amazing Nutrition
1,000 mg6012.980.022View on iHerb →
4
Nutricost, L-Tryptophan, 500 mg, 120 Capsules
Nutricost, L-Tryptophan, 500 mg, 120 Capsules
Nutricost
500 mg12015.950.027View on iHerb →
5
NOW Foods, L-Tryptophan Powder, 2 oz (57 g)
NOW Foods, L-Tryptophan Powder, 2 oz (57 g)
NOW Foods
950 mg5722.030.041View on iHerb →
6
Doctor's Best, L-Tryptophan , 500 mg, 90 Veggie Caps
Doctor's Best, L-Tryptophan , 500 mg, 90 Veggie Caps
Doctor's Best
500 mg9019.990.044View on iHerb →
7
Life Extension, Optimized Tryptophan Plus, 90 Vegetarian Capsules
Life Extension, Optimized Tryptophan Plus, 90 Vegetarian Capsules
Life Extension
1,000 mg3019.200.064View on iHerb →
8
NutraChamps, Dreamrite, 60 Vegan Capsules
NutraChamps, Dreamrite, 60 Vegan Capsules
NutraChamps
100 mg302.000.067View on iHerb →
9
Bluebonnet Nutrition, L-Tryptophan, 500 mg, 60 Vegetable Capsules
Bluebonnet Nutrition, L-Tryptophan, 500 mg, 60 Vegetable Capsules
Bluebonnet Nutrition
500 mg6024.760.083View on iHerb →
10
Natural Balance, Happy Camper, L-Tryptophan, 500 mg, 60 VegCaps
Natural Balance, Happy Camper, L-Tryptophan, 500 mg, 60 VegCaps
Natural Balance
500 mg6029.690.099View on iHerb →
11
EVLution Nutrition, RelaxMode, 45 Veggie Capsules
EVLution Nutrition, RelaxMode, 45 Veggie Capsules
EVLution Nutrition
100 mg456.660.148View on iHerb →
12
Natural Stacks, Serotonin Brain Food™, 60 Vegan Capsules
Natural Stacks, Serotonin Brain Food™, 60 Vegan Capsules
Natural Stacks
1,250 mg2039.950.160View on iHerb →
13
Relaxium, Sleep, 60 Vegan Capsules
Relaxium, Sleep, 60 Vegan Capsules
Relaxium
500 mg3029.990.200View on iHerb →
14
Raw Nutrition, Sleep, Mixed Berry, 5.29 oz (150 g)
Raw Nutrition, Sleep, Mixed Berry, 5.29 oz (150 g)
Raw Nutrition
500 mg3029.990.200View on iHerb →
15
Raw Nutrition, Sleep, Strawberry Kiwi, 5.29 oz (150 g)
Raw Nutrition, Sleep, Strawberry Kiwi, 5.29 oz (150 g)
Raw Nutrition
500 mg3029.990.200View on iHerb →
16
MRM Nutrition, Relax-All, Calm & Sleep, 60 Vegan Capsules
MRM Nutrition, Relax-All, Calm & Sleep, 60 Vegan Capsules
MRM Nutrition
600 mg1519.590.218View on iHerb →
17
Youtheory, Sleep Powder, Lemon Lime, 6 oz (172 g)
Youtheory, Sleep Powder, Lemon Lime, 6 oz (172 g)
Youtheory
250 mg2817.590.251View on iHerb →
18
Natural Stacks, Mood Stack, 2 Bottles, 15 Vegetarian Capsules Each
Natural Stacks, Mood Stack, 2 Bottles, 15 Vegetarian Capsules Each
Natural Stacks
1,250 mg519.130.306View on iHerb →
19
Nutricost, Performance, EAA, 240 Capsules
Nutricost, Performance, EAA, 240 Capsules
Nutricost
50 mg12018.950.316View on iHerb →
20
Primaforce, EAA, 180 Capsules
Primaforce, EAA, 180 Capsules
Primaforce
50 mg9015.000.333View on iHerb →
21
ALLMAX, Essentials, EAA, 11.29 oz (320 g)
ALLMAX, Essentials, EAA, 11.29 oz (320 g)
ALLMAX
220 mg3022.190.336View on iHerb →
22
NOW Foods, Sports, Amino-9 Essentials™ Powder, 11.64 oz (330 g)
NOW Foods, Sports, Amino-9 Essentials™ Powder, 11.64 oz (330 g)
NOW Foods
117 mg5928.170.408View on iHerb →
23
Swanson, Essential Amino Acid Complex, 60 Vegan Capsules
Swanson, Essential Amino Acid Complex, 60 Vegan Capsules
Swanson
150 mg3019.890.442View on iHerb →
24
Natural Balance, Happy Camper, Stress Chill, 120 Vegcaps
Natural Balance, Happy Camper, Stress Chill, 120 Vegcaps
Natural Balance
250 mg3033.190.443View on iHerb →
25
Onnit, New Mood®, Daily Stress Support, 60 Capsules
Onnit, New Mood®, Daily Stress Support, 60 Capsules
Onnit
400 mg3059.900.499View on iHerb →

How we rank L-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.