NOW Supplements 5-HTP 100 mg is the bottle we hand to anyone who just wants to try 5-HTP without studying the category. It's a clean, single-ingredient 100 mg dose of Griffonia simplicifolia-sourced 5-HTP — the standard starting strength — from a brand that ships at enormous volume with consistent GMP quality, at one of the lowest costs per capsule on the list. For a first 5-HTP, that combination of right dose, reliable manufacturing, and low price is exactly what you want. What it is not: enteric-coated, cofactored, or independently third-party certified. Those are real trade-offs that move other picks up or down for specific buyers, but none of them disqualifies NOW as the default. The one thing that applies to this bottle and every other 5-HTP on the market is the safety caveat: 5-HTP raises serotonin, so it must not be combined with antidepressants (SSRIs/SNRIs), MAOIs, triptans, or other serotonergic drugs without a clinician's sign-off. Take that seriously, start at one capsule with food, and here's the full breakdown.
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Read the complete 5-HTP guide →A correct 100 mg starting dose in a clean single-ingredient veg capsule — exactly what a first-time 5-HTP buyer should take. Held below the top only because it's plain: no enteric coating to soften GI upset and no B6/C cofactors. For the default use case that simplicity is a feature, not a flaw.
Sourced from Griffonia simplicifolia seed extract — the standard clean source — in a vegan, Non-GMO capsule made without gluten or soy. NOW's high-volume, consistent supply chain is a genuine strength here; you're getting the same product batch after batch.
NOW's in-house QC labs and GMP-certified facilities are among the most consistent in mass-market supplements. Held below the top because this is house testing, not independent third-party certification — the bar Thorne (#6) clears and the one axis where NOW is bettered.
At roughly $0.18 per 100 mg capsule across a 120-count bottle, this is best-in-class value — the cheapest serious 100 mg option here, alongside Doctor's Best. It makes a multi-month trial inexpensive, which matters because 5-HTP needs a few weeks to judge.
Well-tolerated by most and easy to stay consistent with. The one common complaint — mild nausea on an empty stomach, since it isn't enteric-coated — is usually solved by taking it with food. Felt mood/appetite/sleep response is individual and the evidence base is modest, so we keep this measured.
“100 mg 5-HTP from Griffonia simplicifolia.”
The label dose and source are exactly as stated — 100 mg of 5-HTP extracted from Griffonia simplicifolia seed, the standard clean source. This is the standard starting strength and is correctly described.
“Supports a positive mood and restful sleep.”
There's a real but modest basis. 5-HTP is the direct serotonin precursor, and serotonin is the precursor to melatonin; the best mood evidence (Shaw 2002, PMID 12169147) found a signal of benefit but on a thin, under-powered study base. Reasonable as a supportive claim; overstated if read as a proven mood or sleep treatment.
“Neurotransmitter support.”
Mechanistically accurate — 5-HTP is converted to serotonin (5-HT), a neurotransmitter, in a single enzymatic step. The 'neurotransmitter support' framing describes the established mechanism, distinct from any specific clinical outcome claim.
“Vegetarian/vegan, Non-GMO, made without gluten or soy.”
Consistent with the product's labeling: a vegan capsule, Non-GMO, produced without gluten or soy. These are formulation facts and match the listing.
NOW's defining advantage here is price-per-serving: roughly $0.18 per 100 mg capsule across 120 capsules. Because 5-HTP needs a few weeks of consistent use before you can judge it, a cheap, large bottle lowers the cost of running a fair trial. Nothing else on the list undercuts it meaningfully at the standard 100 mg dose except Doctor's Best, which adds cofactors at a similar price.
This is single-ingredient 5-HTP: no enteric coating to bypass stomach acid, no vitamin B6/C to feed the conversion-to-serotonin pathway. For a default buyer that simplicity is fine, even preferable. But if you know 5-HTP upsets your stomach, Solaray's enteric coating (#5) is the targeted fix; if you want the cofactors, Doctor's Best (#2) bundles them. NOW deliberately competes on clean, cheap, and reliable rather than on features.
NOW's in-house QC and GMP manufacturing are genuinely consistent — one reason it's a safe default. But it is house testing, not third-party certification. If 'I want an independent lab to confirm the label' is your priority, Thorne (#6) is the certified pick. For most buyers, NOW's track record is reassurance enough; for the testing-maximalist, it's the one place NOW is beaten.
The most frequent 5-HTP complaint is mild nausea, and it shows up most on an empty stomach — which matters here because this capsule isn't enteric-coated. Taking it with a meal resolves it for most people. It's a small practical point, but it's the difference between sticking with 5-HTP and quitting it in week one over an upset stomach.
Nothing about NOW changes the core rule: 5-HTP raises serotonin and must not be combined with antidepressants (SSRIs/SNRIs), MAOIs, triptans, tramadol, or other serotonergic drugs without a clinician's sign-off, because of serotonin-syndrome risk. If you take any of those or have a medical condition, clear it with your doctor before starting. This isn't a NOW-specific warning — it's the price of admission for the whole category.
NOW Supplements 5-HTP 100 mg wins the top spot by being the thing most people actually need: a correct 100 mg Griffonia-sourced dose, single-ingredient, from a high-volume GMP brand, at the lowest cost per capsule on the list. There's nothing to study and little to get wrong — start at one capsule with food and give it a few weeks. Look elsewhere only for specific reasons. If you want the conversion cofactors, Doctor's Best (#2) adds B6 and C for similar money. If 5-HTP upsets your stomach, the enteric-coated Solaray (#5) is built for that. If independent third-party certification is your priority, Thorne (#6) is certified. And for everyone, the non-negotiable: do not combine 5-HTP with antidepressants or other serotonergic drugs without a clinician's sign-off — the serotonin-syndrome risk is real. For a clean, low-cost, standard-strength first 5-HTP, this is the bottle.
Check NOW Foods · 100 mg 5-HTP from Griffonia simplicifolia · 120 veg capsules on AmazonThe same 100 mg dose plus the vitamin B6 and C cofactors involved in converting 5-HTP to serotonin, at a similar value price. The smarter buy if you want the conversion pathway fully fed.
See it on the list →The only genuinely enteric-coated pick, designed to bypass stomach acid and reduce nausea — plus B6 and C. The fix if plain 5-HTP upsets your stomach.
See it on the list →The third-party-certified option for buyers who want an independent lab to confirm the label, with B6 included. Pricier per capsule but the testing standout.
See it on the list →Of 108 studies on 5-HTP/tryptophan for depression, only 2 met the quality bar; pooled they showed benefit over placebo, but the authors stressed the evidence was insufficient. The honest anchor for the mood claim — a real signal on a thin base.
Double-blind RCT, 20 obese subjects, 5-HTP 900 mg/day: significant weight loss, reduced carbohydrate intake, and early satiety. Behind the appetite/weight use case — small study, high dose.
In overweight NIDDM patients, oral 5-HTP decreased energy intake and produced weight loss. Reinforces the appetite/satiety mechanism in a second small clinical population.
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