5-HTP vs L-Tryptophan: One Step Apart.

The short answer: In the 5-HTP vs L-tryptophan comparison, L-tryptophan is the essential amino acid that arrives with protein foods, and 5-HTP (5-hydroxytryptophan) is the compound your body forms from it, one enzyme step before serotonin. Tryptophan also builds protein, and 5-HTP doesn't. Our 5-HTP Capsules list 200 mg of 5-HTP, and our Valerian & Chamomile Sleep Capsules list 100 mg of L-tryptophan, each per 2-capsule serving.

Key takeaways

• L-tryptophan is one of nine essential amino acids, so your body can't make it and food has to supply it.
• 5-HTP isn't something you need to eat, because your body makes it from tryptophan, and ours is extracted from Griffonia simplicifolia seed.
• The National Center for Complementary and Integrative Health (NCCIH) says it's unclear how either works and that the sleep data are very limited.
• Three Betterly labels list one or both, and neither belongs next to a medicine that affects serotonin without your prescriber's approval.

Our stake in this: we sell both sides. 5-HTP stands alone in one bottle, L-tryptophan sits in our valerian sleep formula, and the 10 mg melatonin capsule's blend lists both, so we gain nothing by crowning a winner. We read every milligram straight off our own bottles, and where we lean on science, the link goes to the NIH or MedlinePlus page behind it.

5-HTP vs L-tryptophan: what's the real difference?

L-tryptophan is a protein building block your diet has to supply, while 5-HTP is a compound your body makes from tryptophan on the way to serotonin.

The two ingredients sit in separate bottles on our shelf, except for one melatonin capsule that holds both, and that capsule is the easiest place to double up without noticing.

Where do tryptophan and 5-HTP sit in the serotonin pathway?

Tryptophan comes first and 5-HTP second: your body converts tryptophan into 5-HTP, and an enzyme then converts 5-HTP into serotonin.

MedlinePlus Genetics lays out the chain on its page about the DDC gene. Tryptophan is converted to 5-hydroxytryptophan, then an enzyme called aromatic L-amino acid decarboxylase (AADC) removes a carboxyl group, producing serotonin. The page describes serotonin as a chemical messenger that carries signals between nerve cells and other cells.

The chain keeps going. NCCIH's overview of sleep and complementary health approaches groups L-tryptophan and 5-HTP as substances your body can change into melatonin.

So a 5-HTP supplement joins the chain one step later than tryptophan does. That's a map of the route, not a promise. We don't claim either supplement raises serotonin, and none of our labels says so.

Tryptophan also has jobs 5-HTP doesn't. It's part of the protein your body builds, and according to the niacin fact sheet from the NIH Office of Dietary Supplements (ODS), your liver converts a share of it into niacin (vitamin B3).

Is 5-HTP an amino acid?

Not in the usual sense: 5-HTP is a modified form of the amino acid tryptophan, but it isn't one of the protein-building amino acids MedlinePlus lists, and it isn't essential.

The full name, 5-hydroxytryptophan, tells the story. It's tryptophan with a hydroxyl group (one oxygen, one hydrogen) attached at position 5 of the molecule. That small change makes it a different compound.

The MedlinePlus entry on amino acids defines amino acids as molecules that combine to form proteins, and it names tryptophan among the nine essential ones. 5-HTP doesn't appear on the page.

In MedlinePlus's terms, essential means the body can't make it, so it has to come from food. ODS describes tryptophan as an amino acid in proteins and singles out turkey as high in it.

5-HTP is the reverse case, since your body makes it. Our 5-HTP comes from Griffonia simplicifolia seeds, and the panel says so: "from Griffonia simplicifolia seed extract." For how the nine essentials show up in sports products, see our BCAA vs EAA guide.

Is 5-HTP or L-tryptophan better for sleep?

Neither 5-HTP nor L-tryptophan has earned the title of better sleep supplement. NCCIH says both have sedative effects, but how they work is unclear and the data are very limited.

That's NCCIH's plain verdict, and we'd rather pass it on than dress up either one. The same NCCIH page notes that a 2017 sleep-medicine guideline advised against tryptophan for long-running sleep trouble.

Our labels reflect the gap. The 5-HTP Capsules' directions tie the dose to a meal and never mention bedtime. The two products carrying L-tryptophan are sleep formulas that lean on melatonin too, per 2-capsule serving: 2 mg in the valerian capsule and 10 mg in the 10mg Melatonin Sleep Capsules.

So if you're shopping by the word "sleep," the real question isn't 5-HTP or tryptophan. It's which whole formula fits, and whether you want melatonin in it.

Which is safer, 5-HTP or L-tryptophan?

No federal page we found calls 5-HTP or L-tryptophan the safer pick, and NCCIH's firmest warning, about serious reactions alongside serotonin medicines, names L-tryptophan.

In our words, NCCIH says L-tryptophan supplements may cause a dangerous, even life-threatening, serotonin reaction when combined with medicines that change how the body handles serotonin. Anyone on such a medicine needs the prescriber's approval first.

Tryptophan also carries a separate, older safety story, about contamination rather than drug combinations. NCCIH says supplement use of L-tryptophan stopped in 1989, when an illness outbreak was traced to one company's contaminated synthetic product. The page doesn't say when it returned, but L-tryptophan is back on labels today, ours included.

NCCIH adds that several 5-HTP sources, tested because of the close chemical tie to tryptophan, showed no similar contaminants. That's a purity result, not a sign that either ingredient is easier on you, so it doesn't settle this comparison.

On the medicine question, call it a tie. The warning names tryptophan, yet 5-HTP is the very next compound on the route, which is reason enough to keep both away from those medicines unless a prescriber says yes. For drowsiness and the calcium question, see our 5-HTP side-effects guide.

How much 5-HTP and tryptophan do our labels list?

Per 2-capsule serving, our 5-HTP Capsules list 200 mg of 5-HTP, the valerian capsule lists 100 mg of L-tryptophan, and the 10 mg melatonin capsule's blend lists both, unmeasured.

The takeaway: only the melatonin capsule carries both, but any two of these products together stack the same chain twice.

Each of those 5-HTP and tryptophan entries carries a footnote saying the Daily Value isn't established, so nothing on the panel says 200 mg is a lot or 100 mg is a little. Don't read 200 against 100 as "twice as strong," either, for reasons the FAQ below covers.

The blend needs a little math. Under federal labeling rules, a blend names its ingredients from heaviest to lightest (we unpack that rule in what a proprietary blend is). This blend names 14 ingredients. If the panel follows that rule, L-tryptophan, in first place, weighs at least one-fourteenth of 905 mg, about 64.6 mg. 5-HTP, in last place, can't weigh more than that same one-fourteenth.

The combinations we'd flag, per serving of each:

• 5-HTP Capsules plus the valerian capsule: 200 mg of 5-HTP and 100 mg of L-tryptophan, two steps of one chain.
• 5-HTP Capsules plus the 10 mg capsule: 5-HTP from two bottles, one in an unknown amount, next to the blend's St. John's wort.
• The valerian capsule plus the 10 mg capsule: at least 164.6 mg of L-tryptophan if the ordering rule holds, plus 12 mg of melatonin.

NCCIH says taking St. John's wort with medicines that affect serotonin may lead to serotonin-related side effects, which can be serious. That puts the herb in the same conversation as 5-HTP and tryptophan. Our look at whether 10 mg of melatonin is too much walks through the herb and the rest of that panel.

From our shop: 5-HTP Capsules — for readers who want 5-HTP with no L-tryptophan on the panel, listing 200 mg of 5-HTP and 450 mg of calcium per 2-capsule serving, taken once a day before a meal.

How do you take 5-HTP or L-tryptophan, per our labels?

Pick a single product and follow its own directions: two 5-HTP Capsules once a day before a meal, or two valerian capsules daily with water.

1. 5-HTP Capsules. The label's suggested use is two capsules once a day, 20 to 30 minutes before a meal, with an 8 oz (237 ml) glass of water.
2. Valerian & Chamomile Sleep Capsules. The label's suggested use is two capsules daily for adults, with 6 to 8 oz (177 to 237 ml) of water, at no set time.
3. 10mg Melatonin Sleep Capsules. The label's suggested use is two capsules once a day, 20 to 30 minutes before bedtime, with an 8 oz (237 ml) glass of water.

Every one of these labels warns, "Do not exceed recommended dose." Stick to one serving of one product, and don't layer a second tryptophan or 5-HTP product on top.

Label details can settle it. The 5-HTP capsule's shell is hypromellose, and its claims include gluten free and lactose free. The valerian capsule uses a gelatin shell, and non-GMO is the only claim it prints. If you avoid gelatin, that decides it. Also count the 5-HTP capsule's 450 mg of calcium toward any other calcium you take.

From our shop: Valerian & Chamomile Sleep Capsules — for adults who want tryptophan inside a full sleep formula, with 100 mg of L-tryptophan beside 150 mg of valerian extract and 2 mg of melatonin per 2-capsule serving.

When don't you need 5-HTP or an L-tryptophan supplement?

You probably don't need either if you eat protein through the day, take a medicine that affects serotonin, or already use a product that lists one.

• You eat a varied diet with protein in it. Tryptophan is essential, but it arrives with the protein you already eat.
• You take a medicine that affects serotonin, prescription or over-the-counter. Skip both unless your prescriber says otherwise.
• Our 10 mg melatonin capsule is already in your routine. Its blend lists tryptophan first, 5-HTP last and St. John's wort in between, so a separate bottle of either adds to what's there.
• You planned to pair 5-HTP with tryptophan to cover both steps. None of our labels directs that pairing, and it's the exact overlap this page flags.

Want a winding-down product with neither? Reishi Mushroom Relax Gummies pair 200 mg of reishi extract with valerian root, passion flower, lemon balm and L-theanine at 25 mg apiece per 1-gummy serving, and list no melatonin, 5-HTP or tryptophan. Each gummy has 2 g of added sugars. You can check our other sleep and stress relief formulas the same way, panel by panel.

Who should check with a healthcare provider first?

Check with a healthcare provider before trying 5-HTP or L-tryptophan if you take a prescription, are pregnant, nursing or under 18, face surgery, or have a medical condition.

Each of our three labels carries identical caution wording: "Consult a physician if pregnant, nursing, under 18, or have a medical condition." Ask about over-the-counter medicines and other supplements too, since it isn't always obvious which ones touch serotonin. Before surgery, give your care team a full supplement list.

Go in with a pointed question rather than a general one: do tryptophan and 5-HTP from separate products add up alongside your medicines? If either sits inside a blend, mention its spot in the ingredient order, since first place marks the heaviest ingredient and last place the lightest.

FAQ: 5-HTP and L-tryptophan

Can you take 5-HTP and L-tryptophan together?

Taking 5-HTP and L-tryptophan together isn't something we'd do without a healthcare provider's approval. They're back-to-back steps in the same chain toward serotonin, so combining them stacks inputs neither label planned for. Our 10 mg melatonin capsule already pairs them in its blend, along with St. John's wort. If you take a medicine that affects serotonin, skip the combination entirely.

Is L-tryptophan the same as tryptophan?

L-tryptophan and tryptophan usually mean the same ingredient on a supplement label. Amino acids come in two mirror-image forms, called L and D, and the L form is the one in the proteins you eat. Labels add the "L-" to show which form is inside. MedlinePlus simply says tryptophan in its list of essential amino acids.

Is 5-HTP a stronger form of L-tryptophan?

5-HTP isn't a stronger form of L-tryptophan. It's a different compound, one step further along the same chain, according to MedlinePlus Genetics. Because tryptophan also builds protein and helps make niacin, milligrams of one don't convert into milligrams of the other. Judge each product against its own label.

Does eating turkey give you 5-HTP?

Turkey gives you tryptophan, not a measured dose of 5-HTP. The NIH Office of Dietary Supplements names turkey as high in tryptophan and notes your liver turns some of it into niacin. Your body can also make 5-HTP from tryptophan, but no food label shows how much of a meal takes that route.

How many days does one bottle of each cover?

Each of our three bottles covers 30 days at its label's directions, since the 5-HTP Capsules, the Valerian & Chamomile Sleep Capsules and the 10mg Melatonin Sleep Capsules each hold 60 capsules, enough for 30 servings of 2. The labels set no maximum number of weeks. If you switch products, finish or shelve the first bottle before opening the next, so they never overlap.

Sources

• National Center for Complementary and Integrative Health (NCCIH): page on sleep and complementary health approaches
• DDC gene (MedlinePlus Genetics)
• Amino acids (MedlinePlus Medical Encyclopedia)
• St. John's Wort: Usefulness and Safety (NCCIH)
• Niacin: Fact Sheet for Consumers (NIH Office of Dietary Supplements)

If this left you looking for somewhere to start, read 5-HTP capsules with no L-tryptophan — 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.