What are sleep supplements?

Sleep supplements are products designed to be used as part of an evening or bedtime routine.

They can contain minerals, amino acids, plant extracts or a mixture of several ingredients.

But not every sleep ingredient does the same job.

Some ingredients have been studied around sleep onset, which means how long it takes to fall asleep.

Others have been studied around sleep quality, relaxation, stress or next-day fatigue.

What should you look for in a sleep supplement?

Start with the label.

A useful sleep supplement should make it easy to see:

• the exact ingredients
• the amount of each ingredient
• the form of minerals used
• the serving size
• how and when to take it

This is important because seeing "glycine" or "magnesium" on the front of a tub tells you very little if you do not know how much is actually inside.

Sleep quality vs sleep onset: what's the difference?

Sleep research uses lots of terms that sound similar.

They do not all mean the same thing.

This matters when reading supplement research.

An ingredient improving one measure does not automatically mean it improves every part of sleep.

What is glycine and why is it used in sleep supplements?

Glycine is an amino acid.

Your body can make glycine itself, and it is also found in protein-rich foods.

Glycine has attracted interest in sleep supplements because small human studies have tested it before bedtime.

What dose of glycine has been studied?

One of the most useful numbers to remember is 3 grams.

A human study involving people who were unhappy with their sleep used 3g of glycine before bedtime.

Researchers reported improvements in subjective sleep quality and sleep efficiency. Polysomnography also showed shorter time to sleep onset and shorter time to slow-wave sleep. (research)

EFECTIV Sleep Powder provides 3g of L-glycine per serving, matching the amount used in these human sleep studies.

Why is magnesium used in sleep supplements?

Magnesium is an essential mineral.

Your body needs it for many normal processes, including normal nervous system function and normal muscle function.

Because the nervous system is closely involved in sleep and relaxation, researchers have also studied the relationship between magnesium intake and sleep.

A systematic review looked at 9 studies containing 7,582 people.

Observational studies found links between magnesium status and sleep, but the randomised trials produced mixed results. (PubMed PMID 35184264)

What is magnesium bisglycinate?

Magnesium bisglycinate is a form of magnesium where magnesium is bound to glycine.

This makes it especially interesting in a night-time formula because magnesium and glycine are both ingredients that have been studied in sleep research.

Has magnesium bisglycinate been studied for sleep?

Yes.

A 2025 randomised, double-blind, placebo-controlled study included 155 adults aged 18 to 65 who reported poor sleep.

Participants took either magnesium bisglycinate providing 250mg of elemental magnesium each day or placebo for four weeks.

Insomnia Severity Index scores fell by 3.9 points in the magnesium group compared with 2.3 points with placebo.

The between-group result reached statistical significance (p = 0.049), although the researchers described the effect as modest, with an effect size of Cohen's d = 0.2. (PubMed PMID 40918053)

What is L-theanine?

L-theanine is an amino acid found naturally in tea.

It is commonly used in evening supplements because it has been studied around relaxation, stress and sleep without being a traditional sedative.

Does L-theanine make you sleepy?

It is better to think about L-theanine as a relaxation ingredient rather than a sleeping drug.

In one randomised, placebo-controlled crossover study, 30 healthy adults took 200mg of L-theanine each day for four weeks.

Pittsburgh Sleep Quality Index scores improved after L-theanine. Researchers also reported improvements in sleep latency and sleep disturbance measures compared with placebo. (PubMed PMID 31623400)

There are also patents covering the use of theanine in compositions designed to support sleep. (CA2404387A1)

What is L-tryptophan?

L-tryptophan is an essential amino acid.

"Essential" means your body cannot make enough of it by itself, so you need to get it through your diet.

Tryptophan is interesting for sleep because your body can use it in the pathway that makes serotonin.

Serotonin can then act as an intermediate in the body's production of melatonin, the hormone involved in signalling night-time to the body. (research)

Has tryptophan been studied for sleep onset?

Yes, although much of the direct human sleep research is older.

One controlled study tested 250mg, 500mg and 1g of L-tryptophan against placebo in 15 people who reported taking more than 30 minutes to fall asleep.

The 1g dose significantly reduced sleep latency. (PubMed PMID 469515)

A review of around 40 controlled studies concluded that doses of 1g or more most consistently increased subjective sleepiness and reduced sleep latency, particularly in people with mild sleep-onset problems. (PubMed PMID 6764927)

EFECTIV Sleep Powder contains 250mg L-tryptophan per serving.

That means we would not claim its 250mg dose is equivalent to the 1g doses producing the clearest sleep-latency results in older tryptophan research.

What is valerian root?

Valerian is a plant with the botanical name Valeriana officinalis.

Its root has a long history of traditional use in products aimed at relaxation and sleep.

It is also one of the more heavily researched herbal sleep ingredients.

What does the valerian research say?

The answer is mixed.

A 2020 systematic review included 60 studies and 6,894 participants.

The researchers found that results varied between products and preparations, with extract quality likely helping explain some of the differences. (PubMed PMID 33086877)

A newer 2024 umbrella review reached a cautious conclusion: evidence for valerian treating insomnia itself remained weak or inconclusive, although subjective sleep quality may improve. (PubMed PMID 38359657)

EFECTIV Sleep Powder provides 450mg valerian root extract per serving.

What is lemon balm?

Lemon balm is a herb with the botanical name Melissa officinalis.

It has traditionally been used in calming preparations and is now being studied in modern sleep research too.

A double-blind placebo-controlled crossover study of a standardised lemon balm preparation reported an average Insomnia Severity Index score of 6.8 during treatment compared with 9.7 with placebo.

That was a difference of 2.9 points (p = 0.003).

Researchers also reported that 87% of participants said their sleep improved compared with 30% during placebo. (PubMed PMID 39683592)

However, this was a particular standardised lemon balm formulation, so the exact results should not automatically be applied to every lemon balm extract.

EFECTIV Sleep Powder provides 500mg lemon balm leaf extract per serving.

What is chamomile?

Chamomile is one of the best-known herbs associated with bedtime.

It is used in teas, drinks and supplements designed around winding down before bed.

It has also been studied clinically, although the evidence is not completely consistent.

A placebo-controlled pilot study involving 34 adults with chronic insomnia tested 270mg chamomile extract twice daily for 28 days.

That study did not find significant differences in sleep time, sleep efficiency, sleep latency or sleep quality compared with placebo. (PubMed PMID 21939549)

Other research has been more positive. A trial in 60 older adults used 200mg chamomile extract twice daily for 28 days and reported improvements in sleep quality. (PubMed PMID 29154054)

A 2024 systematic review and meta-analysis has since brought together the available clinical trial evidence. (PubMed PMID 39106912)

Sleep Ingredient Research Compared

This table makes it easier to compare actual human research with the ingredients commonly seen on sleep supplement labels.

What do sleep supplement patents tell us?

Patents are not proof that a supplement works.

They can, however, show how researchers and product developers group ingredients according to different parts of the sleep process.

One patented time-release sleep system lists ingredients including glycine, L-theanine, L-tryptophan, magnesium, magnesium glycinate, valerian and lemon balm.

The patent groups ingredients into areas such as sleep onset, sleep quality and sleep recovery. (WO2019005962A1)

There is also patent literature specifically covering theanine compositions designed around sleep. (CA2404387A1)

What does sleep have to do with night-time recovery?

Sleep and recovery are closely linked.

While you sleep, your body is not simply "switched off".

Sleep supports normal brain function, memory, physical recovery and the processes that help prepare you for the next day.

This is why athletes often think about sleep alongside training, nutrition and hydration rather than treating it as a separate issue.

But a sleep supplement cannot make up for consistently poor sleep habits.

A sensible night-time routine still matters.

How do you choose a good sleep supplement?

You do not need a product with 20 ingredients.

You need a product where you can understand why the ingredients are there.

EFECTIV Sleep Powder uses a fully disclosed formula containing:

That gives you something useful to compare with other sleep supplements: not just a list of ingredient names, but the actual amount of each ingredient.

Sleep Supplement FAQs

What ingredients should I look for in a sleep supplement?

It depends on what you want from the formula. Common ingredients with human research include glycine, magnesium, L-theanine, L-tryptophan, valerian, lemon balm and chamomile.

How much glycine has been studied for sleep?

Several human studies have used 3g of glycine before bed.

Is magnesium bisglycinate the same as magnesium?

Magnesium bisglycinate is a form of supplemental magnesium in which magnesium is bound to glycine.

Does L-theanine make you sleepy?

L-theanine is better described as an ingredient studied around relaxation, stress and sleep quality rather than a traditional sedative.

What does L-tryptophan have to do with melatonin?

Tryptophan is used in a pathway that produces serotonin. Serotonin is then used as an intermediate in melatonin production.

Does valerian improve sleep?

Valerian has a large body of research, but results are mixed. Some reviews report improvements in subjective sleep quality, while newer reviews say the evidence for treating insomnia remains inconclusive.

When should you take a sleep supplement?

This depends on the formula. EFECTIV Sleep Powder is designed to be taken 30–60 minutes before sleep.

Are more sleep ingredients always better?

No. The dose, ingredient form, research and transparency of the formula matter more than simply having a long ingredient list.