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L-Tryptophan Ingredient Notes
Tryptophan is an essential amino acid used to build proteins. It is related to serotonin and melatonin metabolism but is a separate ingredient from 5-HTP or melatonin.
Tryptophan is an essential amino acid used to build proteins. It is related to serotonin and melatonin metabolism but is a separate ingredient from 5-HTP or melatonin.
Community experiences
Selected positive personal experiences from external communities, edited and summarized. These accounts do not establish effectiveness.
A contributor who had struggled to sleep well for about seven years wrote that, while using tryptophan, they were able to sleep seven to eight hours and regained their energy. They also described more stable moods during perimenopause and before their periods. They listed one to six months of use, but did not specify the dose or other treatments, so the account cannot establish a treatment effect for insomnia or hormone-related symptoms.
Experience shared by external community contributor A
A contributor who had long been troubled by sleep difficulties and anxiety wrote that they noticed a difference from the first day of using tryptophan. They described feeling better overall while taking it before bed, though not every day, for about three months. They gave the tablet strength but not the number of tablets actually taken, and themselves added a caution about interactions with other medications.
Experience shared by external community contributor B
This page is for general reference only and is not medical advice, diagnosis, treatment, or prescription. Ask a qualified professional if you need medical advice or diagnosis.
What is L-Tryptophan?
Tryptophan is an essential amino acid used to build proteins. It is related to serotonin and melatonin metabolism but is a separate ingredient from 5-HTP or melatonin.
On Supplecipe, you can search iHerb products that mention L-Tryptophan and compare single-ingredient products against broader supplement blends.
Evidence and limitations
A review of 18 papers, with four included in the meta-analysis, found less wakefulness after sleep onset. Other sleep measures did not show the same benefit, so the findings should not be generalized to all sleep problems.
Sutanto et al. (2022): tryptophan sleep review · Mayo Clinic: Tryptophan safety information
Forms and other names
L-tryptophan and tryptophan name the amino acid. 5-hydroxytryptophan (5-HTP) is a different compound, even though they are related in metabolism.
Related ingredients
Related reading, not a recommendation to combine supplements.
Side effects and cautions
Do not combine with antidepressants or other medicines affecting serotonin without checking with the prescriber. Drowsiness, dizziness or nausea may occur; avoid driving and machinery if drowsy. Persistent mood or sleep symptoms need professional care.
Sutanto et al. (2022): tryptophan sleep review · Mayo Clinic: Tryptophan safety information
How to compare iHerb products
- Check the individual tryptophan amount and serving size, plus added 5-HTP, melatonin or other sleep ingredients. A total blend weight is not the tryptophan amount.
- Look for form, serving size, extra ingredients, allergens, and whether the product is a single ingredient or a blend.
- Compare brand, price per serving, ingredient form, and single-ingredient versus complex products.
- Use the search button below to compare iHerb products that mention this ingredient.
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