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Cheapest L-5-Hydroxytryptophan on iHerb

Ranked by real cost per 10 mg of L-5-Hydroxytryptophan — cheapest value first.

Prices updated Jul 25, 2026 · 12 products · Prices in USD

The priciest option here costs about 92.7× more per 10 mg of L-5-Hydroxytryptophan than the best-value pick ProHealth Longevity. 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
ProHealth Longevity, Sleep Longevity, 60 Capsules
ProHealth Longevity, Sleep Longevity, 60 Capsules
ProHealth Longevity
50 mg302.000.013View on iHerb →
2
MRM Nutrition, 5-HTP, 100 mg, 60 Vegan Capsules
MRM Nutrition, 5-HTP, 100 mg, 60 Vegan Capsules
MRM Nutrition
100 mg6019.990.033View on iHerb →
3
MRM Nutrition, 5-HTP, 100 mg, 30 Vegan Capsules
MRM Nutrition, 5-HTP, 100 mg, 30 Vegan Capsules
MRM Nutrition
100 mg3012.510.042View on iHerb →
4
Swanson, Melatonin-Free Sleep Aid, 3-In-1 Formula , 120 Capsules
Swanson, Melatonin-Free Sleep Aid, 3-In-1 Formula , 120 Capsules
Swanson
50 mg6015.990.053View on iHerb →
5
Creekside Natural Therapeutics, Children's Zen Comfort, Raspberry, 60 Fruit Chews, 9.3 oz
Creekside Natural Therapeutics, Children's Zen Comfort, Raspberry, 60 Fruit Chews, 9.3 oz
Creekside Natural Therapeutics
50 mg6018.390.061View on iHerb →
6
Creekside Natural Therapeutics, Children's Zen Comfort, Berry, 45 Soft Chewables
Creekside Natural Therapeutics, Children's Zen Comfort, Berry, 45 Soft Chewables
Creekside Natural Therapeutics
50 mg4519.990.089View on iHerb →
7
Metagenics, SeroSyn™, 90 Capsules
Metagenics, SeroSyn™, 90 Capsules
Metagenics
100 mg9088.950.099View on iHerb →
8
Swanson WIO, Long Day Self-Recovery™, 60 Capsules
Swanson WIO, Long Day Self-Recovery™, 60 Capsules
Swanson WIO
50 mg3015.380.103View on iHerb →
9
Advanced Orthomolecular Research AOR, Ortho Sleep™ with Cyracos, 60 Capsules
Advanced Orthomolecular Research AOR, Ortho Sleep™ with Cyracos, 60 Capsules
Advanced Orthomolecular Research AOR
50 mg3035.160.234View on iHerb →
10
Dream Water, Sleep Gummies, Snoozeberry, 60 Gummies
Dream Water, Sleep Gummies, Snoozeberry, 60 Gummies
Dream Water
10 mg3013.990.466View on iHerb →
11
Dream Water, Original Sleep Powder with SleepStat™ Blend, Snoozeberry, 10 Stick Packs, 0.1 oz (3 g) Each
Dream Water, Original Sleep Powder with SleepStat™ Blend, Snoozeberry, 10 Stick Packs, 0.1 oz (3 g) Each
Dream Water
10 mg55.971.19View on iHerb →
12
Solaray, St. John's Wort, 60 VegCaps
Solaray, St. John's Wort, 60 VegCaps
Solaray
10 mg3037.091.24View on iHerb →

How we rank L-5-Hydroxytryptophan

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.