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Natrol 5-HTP 100 mg Time Release, 90 tablets — gradual-release 5-HTP tablet
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Natrol · 100 mg 5-HTP, time-release tablet · 90 tablets

Natrol 5-HTP 100 mg Time Release Review

8.5/10SAC Product Score™

Natrol 5-HTP 100 mg Time Release is the cheapest way into 5-HTP and the most recognizable brand in the category. The hook is the time-release tablet, which meters the 100 mg out gradually instead of delivering it in a single hit — a format some people find gentler and which pairs naturally with evening/sleep-oriented use. At roughly $0.14 per tablet across 90 tablets, it's the lowest entry price on the list by a clear margin. Two honest clarifications matter. First, time-release is not enteric coating: it slows the release, but it does not bypass stomach acid the way Solaray's coating (#5) is designed to, so it's not the dedicated answer for a sensitive stomach. Second, it's a tablet with binders rather than a clean capsule, it has no B6/C cofactors, and the testing is in-house. None of that disqualifies it as a budget pick — it just defines what you're getting for the low price. And the universal rule holds: 5-HTP raises serotonin, so no combining it with antidepressants or other serotonergic drugs without a clinician's sign-off. Start at one tablet with food.

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Read the complete 5-HTP guide →
▸ THE SCORE

How we built the SAC Product Score™ — 8.5/10

Dose & form (enteric / cofactors)30%8/10

A correct 100 mg dose with a genuine format twist — time-release metering, which some users find gentler and which suits evening use. Held mid-pack because time-release is NOT enteric coating (it still releases in the stomach), there are no cofactors, and it's a binder-containing tablet rather than a clean capsule.

Source & purity (Griffonia)25%8/10

Single-ingredient 5-HTP in an allergen-friendly tablet, free of major allergens (no milk, egg, fish, shellfish, tree nuts, peanuts, wheat, soy, sesame). Scored a notch below the explicitly Griffonia-and-HPLC picks because the listing emphasizes the time-release tablet and allergen profile over source detail, and the tablet form adds binders.

Third-party testing20%7/10

House/GMP testing from a large mass-market brand. Reliable at scale, but not independent third-party certification (the Thorne, #6, standard) — which, combined with the tablet form, is what keeps a popular best-seller at a mid score on quality signals.

Value per day15%10/10

At roughly $0.14 per tablet across 90 tablets, this is the lowest entry price on the list. Pure value is its strongest card — the cheapest way to run a fair multi-week 5-HTP trial.

Real-world mood/sleep response10%8.5/10

The time-release format is the experiential draw — a smoother, more gradual dose that many users prefer, especially for evening/sleep-oriented use, and Natrol is the category's best-selling mood/sleep brand for a reason. With-food dosing handles the usual mild nausea. Felt response is individual and the evidence base is modest, so we keep this measured.

▸ SPECS

The product at a glance

Active
100 mg 5-HTP (1 tablet)
Form
Controlled time-release tablet
Cofactors
None
Coating
Time-release (NOT enteric-coated)
Count
90 time-release tablets
Cost
$13 / bottle = ~$0.14 per 100 mg tablet
Allergens
Free of major allergens; vegetarian
Testing
House/GMP testing
Safety
Do not combine with SSRIs/SNRIs, MAOIs, triptans or other serotonergic drugs
▸ TRUTH CHECK

Marketing claims vs. reality

Verified

“100 mg 5-HTP in a controlled time-release tablet.”

Matches the label — a 100 mg 5-HTP tablet formulated for controlled time-release. The time-release format is real and is the product's central feature.

Partial

“Time-release delivery for sustained support.”

The tablet is genuinely formulated to release gradually, which is accurate. 'Sustained support' is a reasonable description of the delivery mechanism, but it shouldn't be read as enteric coating (it still releases in the stomach) or as a proven clinical advantage over standard 5-HTP.

Partial

“Supports a balanced mood and restful sleep.”

There's a modest mechanistic basis — 5-HTP is the serotonin precursor and serotonin is upstream of melatonin. The mood evidence is thin (Shaw 2002, PMID 12169147) and there's no strong stand-alone human sleep RCT, so this is fair as supportive framing, overstated as a proven mood/sleep treatment.

Verified

“Free of major allergens; vegetarian.”

Consistent with the labeling — the product is vegetarian and free of the major allergens (milk, egg, fish, shellfish, tree nuts, peanuts, wheat, soy, sesame). Formulation facts that match the listing.

▸ THE DEEP DIVE

What our test actually found

01Lowest entry price on the list — that's the headline

At roughly $0.14 per tablet, Natrol is the cheapest 5-HTP here, which is exactly what you want for a low-commitment first try. Because 5-HTP needs a few weeks of consistent use to evaluate, the rock-bottom price makes running a fair trial almost free. If cost is the single thing standing between you and trying 5-HTP, this is the bottle that removes the excuse.

02Time-release is the real differentiator — but know what it is

The gradual-release tablet is the genuine point of difference, and some people clearly prefer a metered dose to an all-at-once capsule, especially in the evening. The crucial clarification: time-release is NOT enteric coating. It slows the release but doesn't carry the dose past stomach acid, so it's not the dedicated fix for a sensitive stomach — that's Solaray's enteric coating (#5). Conflating the two is the most common mistake buyers make with this product, and we won't.

03It's a tablet with binders, not a clean capsule

Delivering time-release requires a tablet matrix, which means binders and excipients that a simple capsule doesn't have. That's a fair trade for the format and the price, but if you specifically want the shortest ingredient list or a clean veg capsule, NOW (#1), Jarrow (#9), or Pure Encapsulations (#3) are the capsule options. The tablet form is part of why this scores mid-pack on the source/purity axis.

04No cofactors, in-house testing — the expected budget trade-offs

There are no B6/C cofactors here, and the testing is house/GMP rather than independent certification. For a budget best-seller, those are the predictable compromises. If you want the cofactors, Doctor's Best (#2) adds them cheaply; if you want certified testing, Thorne (#6). Natrol competes on price and the time-release format, not on extras.

05Cheap doesn't change the safety rule

The low price makes 5-HTP accessible, but it doesn't soften the core caution: 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 first. The same warning applies to the cheapest bottle and the most expensive.

▸ THE TRADE-OFFS

Pros & cons, no sugar-coating

Pros
  • Lowest entry price on the list — ~$0.14 per tablet across 90 tablets
  • Time-release tablet meters the dose out gradually
  • Best-known US 5-HTP brand; widely available and allergen-friendly
  • A genuinely low-commitment way to run a fair first trial
  • Vegetarian and free of major allergens
Cons
  • Time-release is NOT enteric coating — not the dedicated fix for stomach upset
  • Tablet with binders rather than a clean capsule
  • No B6/C cofactors; house/GMP testing only
▸ THE BOTTOM LINE

The budget entry point — buy it for price and the gradual time-release.

Natrol 5-HTP 100 mg Time Release is the right pick when price is the deciding factor. It's the cheapest 5-HTP on the list from its most recognizable brand, and the time-release tablet is a real differentiator — a smoother, more gradual dose that many people prefer, particularly for evening use. For a first, low-commitment trial, it's hard to argue with the value. Just buy it for the right reasons. If your actual concern is stomach upset, time-release won't solve it the way Solaray's genuine enteric coating (#5) will — and Solaray adds the cofactors too. If you want a clean capsule without binders, look at NOW (#1) or Jarrow (#9); if you want the B6/C cofactors, Doctor's Best (#2). And the non-negotiable for every 5-HTP: do not combine it with antidepressants or other serotonergic drugs without a clinician's sign-off. Start at one tablet with food, give it a few weeks, and treat it as the cheap experiment it's priced to be.

Check Natrol · 100 mg 5-HTP, time-release tablet · 90 tablets on Amazon
▸ ALTERNATIVES

If this doesn’t fit — try these

NOW Supplements 5-HTP 100 mg

9.4/10

A clean single-ingredient veg capsule (no tablet binders) at near-identical value — the pick if you'd rather have a capsule than a time-release tablet.

See it on the list →

Solaray 5-HTP Enteric Coated

8.3/10

The genuinely enteric-coated option with B6 and C — the right choice if your real concern is stomach upset, which time-release does not specifically address.

See it on the list →

Natrol 5-HTP 200 mg Time Release

7.5/10

The same time-release format at a 200 mg dose for experienced users who want a higher, all-day level from one tablet.

See it on the list →
▸ RESEARCH

Sources & further reading

  1. Shaw 2002 (Cochrane)Shaw K, Turner J, Del Mar C · 2002 · Cochrane Database of Systematic Reviews · PMID 12169147

    Tryptophan and 5-hydroxytryptophan for depression

    Of 108 studies on 5-HTP/tryptophan for depression, only 2 met the quality bar; pooled they favored 5-HTP/tryptophan over placebo, but the authors stressed the evidence was insufficient. The honest anchor for the mood claim.

  2. Cangiano 1992Cangiano C, Ceci F, Cascino A, et al. · 1992 · The American Journal of Clinical Nutrition · PMID 1384305

    Eating behavior and adherence to dietary prescriptions in obese adult subjects treated with 5-hydroxytryptophan

    Double-blind RCT, 20 obese subjects, 5-HTP 900 mg/day: significant weight loss, reduced carbohydrate intake, early satiety. Behind the appetite/weight use case — small study, high dose.

  3. Cangiano 1998Cangiano C, Laviano A, Del Ben M, et al. · 1998 · International Journal of Obesity and Related Metabolic Disorders · PMID 9705024

    Effects of oral 5-hydroxy-tryptophan on energy intake and macronutrient selection in non-insulin dependent diabetic patients

    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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