Melatonin Dosage (0.5–5 mg), Best Time & Side Effects

What is melatonin?

Melatonin is a hormone made by the pineal gland (a small organ deep in the middle of your brain). Your body releases more of it when it gets dark, signaling your internal clock that 'night has come.'

So it doesn't knock you out like a sleeping pill. It's closer to setting your sleep rhythm. It's also a strong antioxidant that clears out free radicals in the body.

The catch is that your body makes less of it as you age. It drops sharply from your mid-50s, which can make it harder to fall asleep and cause you to wake up more often.

In some countries melatonin is prescription-only, but in the US you can easily buy it over the counter as a supplement. That makes it all the more important to manage your own dose carefully.

Who it may help

□ You've had trouble falling asleep at night since your 50s
□ Your bedtime changes from day to day
□ You work night shifts
□ You often travel across many time zones
□ You've been sleeping poorly since menopause
□ You have mild insomnia and don't want to go as far as a sleeping pill

In studies, people who tended to fall asleep late fell asleep about 30 minutes earlier on average with just 0.5 mg, and slept better.

Who may get less benefit or should avoid it

People in their 20s to 40s who can't sleep because their mind is racing: At this age you usually make enough melatonin. If stress or worry is keeping you up, it may not help much.
People with a mental health condition or taking psychiatric medication: Don't take it casually; always talk to your doctor.
People taking sleeping pills or sedatives: The sedating effects can stack and leave you too drowsy.
People who drink heavily and often (3+ times a week): Combined with alcohol it can cause dizziness and falls, so consider stopping.
People taking blood pressure drugs or blood thinners: Talk to your doctor first.

Melatonin dosage: less is more

Bottom line: Start at 0.5–1 mg and raise it slowly only if needed. 5 mg a day or less.

With melatonin, more doesn't mean a stronger effect. Many US products have 5–10 mg per tablet, but there's no need to start that high.

Try 1 mg (or 0.5 mg) for a few days.
If it's not enough, go up step by step: 2 mg → 3 mg → 5 mg.
Once you find the lowest amount that works for you, stay there.

Situation	Suggested dose
Just starting	0.5–1 mg
Typical range	1–3 mg
Upper limit	5 mg a day

Many people report frequent diarrhea at 5 mg or more, especially at 10 mg. Cutting back to 2–3 mg usually fixes it.

When to take melatonin

Take it about 1 hour before bed with water.
It's best on an empty stomach. A while after dinner is about right.
Don't take it during the day. Even for antioxidant purposes, daytime use can make you drowsy and lower your blood pressure.

For jet lag, do this.

Take it around 9 p.m. (local time) on the night you arrive. Start a little higher on the first night.
Over the next 3–4 days, taper down, for example 5 mg → 3 mg → 2 mg.
Stop once your rhythm has adjusted.

Types: immediate release, extended release, plant-based

Type	What to know	Best for
Immediate release (standard)	Dissolves fast and works fast. It only stays in your body for 2–3 hours.	People who have trouble falling asleep
Extended release (Extended / Time Release)	Dissolves slowly and works longer. Prescription melatonin (2 mg) in some countries is this form.	People who wake up often during the night
Plant-based melatonin	Extracted and concentrated from plants. Tends to be pricier and lower dose.	People who'd rather avoid synthetic ingredients

Opinions differ on which is better, immediate or extended release. To keep it simple: immediate release if falling asleep is the problem, extended release if staying asleep is the problem.

Synthetic melatonin has been found in some products labeled plant-based. If you choose plant-based, pick a product that publishes its potency test results (certificate of analysis).

Gummies go through a lot of heat during manufacturing. Critics point out it's hard to guarantee that such a tiny amount of the ingredient is spread evenly.

Melatonin side effects and long-term use

It's fairly safe short term, but remember it's a hormone.

Common side effects

Grogginess into the next morning, headache, dizziness, nausea
Diarrhea at high doses
Rarely, trouble sleeping instead

These usually improve if you lower the dose or take it less often, and go away when you stop.

Cautions with long-term use

Some believe that supplying it from outside long term may reduce how much your body makes on its own.
Some people say it works less well over time, or they start waking up in the early morning.
There's also data suggesting long-term use may affect mood, sleep, reproductive function, and blood sugar control.

Rather than taking it every night out of habit, use the smallest amount when you need it. If your sleep doesn't improve, work on sleep habits too (going to bed and waking up at the same time, less screen time before bed).

What to take with it, and what to avoid

Good pairings: Magnesium is a popular choice. It's a calming mineral and is often used for sleep alongside melatonin.

Don't stack: Combining several ingredients with calming effects, like ashwagandha, theanine, and St. John's wort, can leave you sluggish and drained during the day. Add one at a time and see how you react.

Medications and conditions to watch

Caution Sleeping pills and sedatives — Sedating effects may stack and leave you overly drowsy — don't take together; talk to your doctor
Caution Psychiatric medications — Affects hormone regulation — talk to your doctor
Check Blood pressure drugs — Blood pressure may drop further — talk to your doctor
Check Blood thinners (antithrombotics) — May affect how they work — talk to your doctor
Check Alcohol — Over-sedation of the central nervous system, with risk of dizziness and falls
Note Ashwagandha — Calming effects overlap — sluggishness and low energy

Combinations

Works well with: Magnesium

Space apart from: Ashwagandha, St. John's wort

How it appears on the label

Match the names on the Supplement Facts panel with the forms of Melatonin explained on this page.

On the label	What it is	What it means
Immediate Release Quick Dissolve	Immediate release	For trouble falling asleep
Extended Release Time Release Sustained Release	Extended / time release	For waking up often during the night

Best Melatonin supplements on Amazon, compared

Bottom line

We checked the labels of 22 popular melatonin products on Amazon: 5 recommended, 8 depend on your needs, 9 not recommended.

Best overall — Nature's Bounty Melatonin 1 mg Tablets: 1 mg per tablet — a good starting dose (Per serving: 1 mg)
No water needed — Natrol Melatonin 1 mg Fast Dissolve Tablets, Strawberry: 1 mg per tablet — a good starting dose (Per serving: 1 mg)
Standard dose — Nature Made Melatonin 3 mg Tablets: 3 mg per tablet — in the typical range (1–3 mg) (Per serving: 3 mg)
Easy to adjust — Natrol Liquid Melatonin for Adults 1 mg, Berry (2 fl oz): 1 mg per 4 mL — adjust in tiny steps of 1 mL (0.25 mg) with the dropper (Per serving: 1 mg)
Staying asleep — Nature's Bounty Dual Spectrum Melatonin 5 mg Bi-Layer Tablets: Immediate-release plus time-release layers — aims at both falling asleep and waking up at night (Per serving: 5 mg)
Gummy — Amazon Basics Melatonin 5 mg Gummies, Strawberry (2 per serving): 5 mg in 2 gummies — take 1 to cut it to 2.5 mg (Per serving: 5 mg)

We checked the labels of popular Amazon products and rated them by the criteria above. Cost per day is relative — compared with other products of the same supplement. Check Amazon for the current price.

Best overallMelatonin 1 mg TabletsNature's Bounty No water neededMelatonin 1 mg Fast Dissolve Tablets, StrawberryNatrol Standard doseMelatonin 3 mg TabletsNature Made Easy to adjustLiquid Melatonin for Adults 1 mg, Berry (2 fl oz)Natrol Staying asleepDual Spectrum Melatonin 5 mg Bi-Layer TabletsNature's Bounty GummyMelatonin 5 mg Gummies, Strawberry (2 per serving)Amazon Basics

Recommended 5

RecommendedNature's Bounty

Melatonin 1 mg Tablets

Regular tablets (immediate-release) · Per serving: 1 mg · Cost per day: low

1 mg per tablet — a good starting dose
Melatonin only, almost no additives
Regular tablet, good for trouble falling asleep
Lowest cost per day in this comparison

First-timers, 50+ with trouble falling asleep

Melatonin: who should take it, how much, and when

What is melatonin?

Who it may help

Who may get less benefit or should avoid it

Melatonin dosage: less is more

When to take melatonin

Types: immediate release, extended release, plant-based

Melatonin side effects and long-term use

What to take with it, and what to avoid

Medications and conditions to watch

Combinations

How it appears on the label

Best Melatonin supplements on Amazon, compared

Bottom line

Recommended 5

Melatonin 1 mg Tablets

Melatonin 1 mg Fast Dissolve Tablets, Strawberry

Melatonin 3 mg Fast Dissolve Tablets, Strawberry

Melatonin 3 mg Tablets

Liquid Melatonin for Adults 1 mg, Berry (2 fl oz)

Depends on your needs 8

Dual Spectrum Melatonin 5 mg Bi-Layer Tablets

Melatonin 5 mg Fast Dissolve Tablets, Strawberry

Melatonin 5 mg Fast Dissolve Tablets

Melatonin 5 mg Gummies, Strawberry (2 per serving)

Melatonin Extra Strength 5 mg Gummies (per 2 gummies)

Melatonin 3 mg Sugar Free Gummies (per 2 gummies)

Melatonin Gummies 3 mg

Melatonin 5 mg Gummies, Strawberry

Not recommended 9

Melatonin Max Strength 10 mg Gummies (per 2 gummies)

Melatonin 10 mg Gummies, Strawberry

Melatonin 10 mg per Serving Gummies

Advanced Sleep Melatonin 10 mg Time Release Tablets

Melatonin 10 mg Maximum Strength Tablets

Premium Super Strength Melatonin 10 mg Rapid Release Capsules

Melatonin 12 mg Fast Dissolve Tablets

Melatonin 20 mg Fast Dissolve Tablets with Vitamin B6

Melatonin 20 mg Quick Dissolve Tablets

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