Melatonin and 5-HTP Together: Should You?

The short answer: Melatonin and 5-HTP together is a pairing you'll find on sleep formula labels, ours included, because both sit on one chain: your body turns tryptophan into 5-HTP, 5-HTP into serotonin, and serotonin into melatonin. No federal page we found sets a combined amount. Our 10mg Melatonin Sleep Capsules already hold both, so don't add our 5-HTP Capsules (200 mg of 5-HTP per 2-capsule serving) without a professional's okay.

Key takeaways

• Melatonin is a hormone your brain releases as it gets dark, while 5-HTP is an in-between compound your body forms from tryptophan before it becomes serotonin.
• The National Center for Complementary and Integrative Health (NCCIH) calls the way 5-HTP works unclear, so taking it doesn't guarantee more melatonin.
• Betterly's 10 mg capsules list 10 mg of melatonin plus a 905 mg blend that includes 5-HTP, L-tryptophan, GABA and St. John's wort, per 2-capsule serving.
• Adding a 5-HTP product (ours lists 200 mg per 2-capsule serving) to that blend means 5-HTP from two sources, and only one amount is printed.
• If you take any medicine that affects serotonin, skip every product on this page until your prescriber says yes.

A note on our stake: Betterly sells a melatonin capsule with 5-HTP in its blend, a plain 5-HTP capsule, a valerian capsule that lists tryptophan and melatonin, and a low-dose melatonin strip. That gives us a reason to sell you two bottles. We'd rather show you why one is usually the limit, using our own panels.

Can you take melatonin and 5-HTP together?

Melatonin and 5-HTP are sold together in some sleep formulas, one of ours included, but no federal page we found sets a combined amount or shows the pair works better.

Maybe you already use melatonin and read that 5-HTP helps the body make it. Or you've spotted a label listing both and wonder if that's a warning sign. On its own, it isn't. It's a reason to check what you'd really be swallowing:

• Start with your medicines. Anything that acts on serotonin, whether prescribed or bought off the shelf, turns the answer into "ask your prescriber first."
• Look for hidden overlap. A sleep blend may already contain 5-HTP, tryptophan or both, so a second bottle doubles up without saying so.
• Reread the directions. Each label's suggested use is written for that product alone, and none of ours tells you to add another.

Is melatonin the same as 5-HTP?

Melatonin and 5-HTP aren't the same: melatonin is a hormone your brain produces as darkness falls, and 5-HTP is a compound your body forms out of tryptophan.

They are related, though. Here's the route:

1. Tryptophan. An amino acid that arrives with the protein you eat.
2. 5-HTP (5-hydroxytryptophan). Your body converts tryptophan into this compound.
3. Serotonin. An enzyme reshapes 5-HTP into serotonin, one of the body's chemical messengers.
4. Melatonin. Serotonin is then converted into melatonin, the hormone linked to darkness and your 24-hour clock.

The middle of that route is spelled out in the DDC gene entry from MedlinePlus Genetics, which credits an enzyme called AADC with turning 5-HTP into serotonin. The far end shows up at NCCIH, which names L-tryptophan and 5-HTP as supplement ingredients the body can convert to melatonin.

So 5-HTP sits two steps upstream of melatonin. Think of it as a building block the body uses to make serotonin, not as a weaker or stronger melatonin.

Our 5-HTP Capsules name the seed extract of Griffonia simplicifolia, a plant, as their 5-HTP source.

Does 5-HTP increase melatonin?

5-HTP can be turned into melatonin in the body, according to NCCIH, but no federal page we found shows that a 5-HTP supplement raises melatonin by any set amount.

NCCIH's sleep-supplement safety page is plain about the gap. It says supplements with L-tryptophan or 5-HTP have sedating effects, yet it's unclear how they work, and the data on sleep are very limited.

That undercuts the logic behind stacking. "More raw material, more melatonin" sounds tidy, but a building block being on hand doesn't tell you how much of it ends up as melatonin, or when.

Darkness is the other half. NCCIH's melatonin fact page says darkness is what prompts your brain to make melatonin, and light at night can block that production.

If melatonin is what you're after, a melatonin product at least prints a declared amount. The 1mg Melatonin Sleep Strips list 1 mg of melatonin plus 50 mg of valerian root extract and extracts of lavender (20 mg), chamomile (10 mg) and hibiscus (10 mg) per 1 Oral Strip (210 mg) serving. So even our simplest melatonin product isn't melatonin alone.

5-HTP vs melatonin: how do they differ?

5-HTP and melatonin differ in what they are, where they sit in the chain, and what our labels say about when to take them.

On timing, our melatonin capsule points you to bedtime, and the strip names no time at all. The 5-HTP label ties its serving to a meal, which could just as well be dinner, and never mentions sleep. None of these directions plans for a second product, so the two aren't interchangeable, and they aren't a ready-made pair.

Should you add 5-HTP to a melatonin blend that already has it?

Adding a 5-HTP product (ours lists 200 mg per 2-capsule serving) to a blend that already has 5-HTP calls for a professional's okay, since you can't total the dose.

Our 10 mg capsules list, per 2-capsule serving, 10 mg of melatonin, 1.8 mg of vitamin B6, 17 mg of calcium, 13 mg of magnesium and a 905 mg Sleep Formula Proprietary Blend. That blend names 14 ingredients. L-tryptophan comes first, and 5-HTP from Griffonia simplicifolia seed comes last.

So one serving already covers three stops on the chain: tryptophan, 5-HTP and melatonin. What the panel doesn't give you is the 5-HTP amount, because a blend prints one total and no per-ingredient numbers. Our guide to reading a proprietary blend shows how that format works.

Now add our 5-HTP Capsules, which list 450 mg of calcium alongside 200 mg of 5-HTP in each 2-capsule serving. You'd have a known 200 mg plus an unknown share from the blend. The labels can't tell you the total, and neither can we.

The same blend contains St. John's wort. NCCIH's page on St. John's wort warns that pairing the herb with medicines that act on serotonin can bring on serotonin-related side effects, some of them serious. We found no federal page on extra 5-HTP beside the herb, which is why that call belongs with a professional. The melatonin dose gets its own look in our breakdown of 10 mg melatonin.

Our Valerian & Chamomile Sleep Capsules sit on the same chain, listing 100 mg of L-tryptophan and 2 mg of melatonin per 2-capsule serving. Pair them with the 5-HTP Capsules and two bottles cover three stops, so the same "ask first" applies.

Each row assumes one label serving per product. Only the single-product rows leave you with one set of directions covering everything you take.

From our shop: 10mg Melatonin Sleep Capsules — 10 mg of melatonin plus a 905 mg blend that already includes 5-HTP and L-tryptophan per 2-capsule serving, for adults who want both in one product instead of two.

What about GABA, melatonin and 5-HTP together?

GABA, melatonin and 5-HTP already share one serving in our 10mg Melatonin Sleep Capsules, where GABA sits inside the same 905 mg blend as the 5-HTP.

That blend also holds L-theanine, chamomile, lemon balm, passion flower, hops and ashwagandha root, among others. If you already use it, that one bottle covers the idea.

The overlap problem repeats here. Our L-Theanine & GABA Calm Strips list 25 mg of GABA, 50 mg of L-theanine and 6 mg of vitamin B6 per 1 Oral Strip (290 mg) serving, with no melatonin or 5-HTP. Pair a strip with the capsule, and GABA and L-theanine each come from two sources, one printed and one hidden in the blend.

How do you take them, going by our labels?

Take one product at a time and follow its own directions, since none of our melatonin or 5-HTP labels tells you to combine it with another.

The three main panels, side by side:

• 10 mg capsule: two capsules, once a day, 20-30 minutes before bed, with 8 oz (237 ml) of water.
• 5-HTP capsule: two capsules, once a day, 20-30 minutes ahead of a meal, with the same 8 oz of water.
• 1 mg strip: one strip left to dissolve on the tongue, once daily, with no time given.

Three habits help:

1. Don't split capsules to shrink a dose. If 10 mg feels like more than you want, the 1 mg strip is our lowest-dose melatonin product.
2. Skip the second round at 3 a.m. Every label here reads "Do not exceed recommended dose."
3. Hold off on driving until you know how a serving affects you, since NCCIH lists sleepiness among melatonin's reported side effects.

From our shop: 5-HTP Capsules — each 2-capsule serving lists 200 mg of Griffonia seed 5-HTP plus 450 mg of calcium, for adults who want 5-HTP in its own bottle, with no melatonin.

When don't you need melatonin or 5-HTP?

You likely don't need melatonin or 5-HTP if you fall asleep easily and wake up rested, or if light and an uneven schedule are the real issue.

Honest reasons to leave both on the shelf:

• Your evenings are bright. NCCIH notes that nighttime light can block melatonin production, so dimming lamps and screens is the free first move.
• You take a medicine that affects serotonin. Then 5-HTP, tryptophan blends and St. John's wort are off the table unless your prescriber agrees.
• You already use our 10 mg capsule. It holds melatonin and 5-HTP, so a second bottle only adds more of the same.
• You'd prefer neither ingredient. Our Sleep & Stress Relief collection includes magnesium, reishi and calm-strip options with no melatonin or 5-HTP on the panel.

If rough nights have been your normal for more than a few weeks, that's a job for a healthcare provider, not a second bottle.

Who should check with a healthcare provider first?

Talk to a healthcare provider before combining melatonin and 5-HTP if you take any medicine, are pregnant, nursing or under 18, have a medical condition, or have surgery coming up.

Every label named here carries one shared caution: "Consult a physician if pregnant, nursing, under 18, or have a medical condition." The federal pages go further:

• Medicines that affect serotonin. NCCIH says L-tryptophan supplements taken with these medicines may set off serotonin reactions it describes as life-threatening. Our 10 mg capsule's blend lists L-tryptophan, 5-HTP and St. John's wort, so ask first.
• Many other prescriptions. NCCIH says St. John's wort can make many medicines work less well, birth control pills and blood thinners among them.
• Blood thinners and melatonin. People on blood thinner medications should use melatonin only under medical supervision.
• Older adults. In older people, melatonin may keep working longer than in younger adults, leading to drowsiness the next day.
• Pregnancy and breastfeeding. Research on melatonin's safety in these stages is lacking.

When you ask, show each product's full Supplement Facts panel. The word "melatonin" on the front tells a pharmacist nothing about the tryptophan, 5-HTP and St. John's wort on the back. Our guide to 5-HTP side effects covers who should skip 5-HTP. Before surgery, tell your care team about every product here.

FAQ: melatonin and 5-HTP

Is 5-HTP or melatonin better for sleep?

No federal page we found names 5-HTP or melatonin the better sleep supplement. NCCIH ties melatonin to the timing of your 24-hour clock and to sleep. For 5-HTP, it says the sleep data are very limited and how it works is unclear. So melatonin has the clearer job description, not a proven win.

What side effects can melatonin and 5-HTP cause?

Melatonin's side effects in short-term studies were mild, NCCIH says, including headache, dizziness, nausea and sleepiness. NCCIH also notes that 5-HTP has sedating effects. We found no federal page that measured the two taken together, so we'd stick to one labeled serving of one product and ask a pharmacist before adding another.

Can you take 5-HTP in the morning and melatonin at night?

Splitting 5-HTP and melatonin across the day still means taking both, so it doesn't settle the overlap or medicine questions. Our 5-HTP label ties its serving to a meal and names no time of day, while our capsule label points to bedtime. Neither label plans for the other product, so ask a healthcare provider before trying a split routine.

How long can you take melatonin and 5-HTP?

No federal source we found gives a time limit for melatonin and 5-HTP together, and none of our labels sets one. NCCIH says melatonin's possible long-term side effects are unclear. Each product here holds 30 servings (60 capsules, or 30 strips). When one runs out, pause and take stock, and if you still want either, talk it over with a healthcare provider.

Sources

• National Center for Complementary and Integrative Health (NCCIH): page on sleep and complementary health approaches
• Melatonin: What You Need To Know (NCCIH)
• DDC gene (MedlinePlus Genetics)
• St. John's Wort: Usefulness and Safety (NCCIH)

If this left you looking for somewhere to start, read melatonin capsules with 5-HTP in the blend — its amounts per serving are listed on the page. For the practical questions this raises, how dosing, sourcing and subscriptions work is answered in one place.