Go Wise Melatonin Sleep Formula bottle, 60 veggie capsules

Melatonin, GABA and L-Theanine: How Sleep Supplements Work

Melatonin, GABA and L-theanine work in different ways. Melatonin is a timing signal: it tells your body that it is night. GABA and L-theanine are aimed at the other half of the problem, winding down, and of the two, L-theanine has the better human evidence. None of them is a sedative in the way a prescription sleeping pill is, and their effects in studies are real but modest.

Many sleep formulas combine these with herbs such as chamomile, and some also add St. John's wort or 5-HTP, which change who can safely take them. Here is what each ingredient does, what the research shows and what to check on the label.

In brief

  • Melatonin helps set the timing of sleep. In a meta-analysis it helped people fall asleep about 7 minutes faster and sleep about 8 minutes longer.
  • L-theanine (200 mg a day) improved sleep quality scores in a small four-week trial in healthy adults.
  • Evidence for oral GABA and sleep is very limited so far.
  • Blends containing St. John's wort or 5-HTP can interact with antidepressants, birth control and many other drugs.

How melatonin, GABA and L-theanine work

Melatonin is a hormone your brain makes in response to darkness. Levels rise in the evening and fall toward morning, and that rise is one of the cues that shifts your body into night mode. A supplement adds to that signal, which is why melatonin is often used for jet lag or for a body clock that runs late. It does not knock you out, and it does little for a mind that is still racing at midnight.

GABA (gamma-aminobutyric acid) is the brain's main calming neurotransmitter. Many sleep medicines work by boosting GABA activity. Taking GABA by mouth is a different matter, because it is not clear how much crosses from the blood into the brain.

L-theanine is an amino acid found in tea leaves. It is thought to promote a relaxed but alert state, which is why a cup of green tea feels different from a cup of coffee with the same caffeine. Chamomile, lemon balm, passion flower and hops are traditional calming herbs that often show up alongside these three.

What the evidence shows

For melatonin, a meta-analysis of 19 placebo-controlled trials with 1,683 participants who had primary sleep disorders found that melatonin shortened the time to fall asleep by about 7 minutes and added about 8 minutes of total sleep. Overall sleep quality improved as well. The authors described the effect as modest, but noted it did not fade with continued use, and that longer trials and higher doses showed larger effects on sleep timing (Ferracioli-Oda et al., PLoS One 2013). NCCIH notes that the strongest evidence is for jet lag and for body clocks that run late, and that major sleep medicine groups prefer cognitive behavioral therapy over melatonin for long-term sleep trouble (NCCIH, Melatonin: What You Need To Know).

For L-theanine, a randomized, double-blind crossover trial gave 30 healthy adults 200 mg a day for four weeks. Compared with placebo, their scores for sleep quality, time to fall asleep and sleep disturbance improved, as did stress-related scores (Hidese et al., Nutrients 2019). It was a small study, and two of the authors worked for the company that supplied the L-theanine.

For oral GABA, a systematic review of 14 placebo-controlled trials concluded there is limited evidence for stress and very limited evidence for sleep benefits (Hepsomali et al., Frontiers in Neuroscience 2020). Chamomile looks a little better: a meta-analysis of 12 trials found improved sleep quality, though it found little evidence of an effect in the one trial of people with a diagnosed sleep disorder (Hieu et al., Phytotherapy Research 2019).

The honest summary is that melatonin and L-theanine have the most support, the effects are small to moderate, and good sleep habits still do most of the work. Some nutrients also play a role, which we cover in vitamins for better sleep.

Dose, timing and how to take them

Melatonin is usually taken 30 to 60 minutes before bed. Timing matters more than people expect, because the goal is to line up the extra signal with the time you want to be asleep. Keep the lights low after you take it, and try to go to bed at a consistent time.

Dose varies widely between products, and more is not always better. The meta-analysis above included a range of doses, and many products on the shelf contain much less than 10 mg. If you are new to melatonin, ask your doctor or pharmacist what dose makes sense for you. Label accuracy is another issue: a 2017 analysis of 31 melatonin supplements found actual content ranged from 83% below to 478% above the label, and some contained serotonin (Erland and Saxena, Journal of Clinical Sleep Medicine 2017).

For L-theanine, the trial above used 200 mg a day. For GABA and herbal blends, look at whether the label lists individual amounts. In a proprietary blend it often does not, so you cannot compare the dose with what was studied.

Who should be careful

Melatonin may cause headache, dizziness, nausea and next-day drowsiness. Do not drive or operate machinery after taking a sleep aid. NCCIH advises medical supervision if you take blood thinners or have epilepsy, and notes that there is little research on melatonin in pregnancy or while breastfeeding. Keep all melatonin products away from children.

Read the full ingredient list. St. John's wort interacts with a long list of medicines. According to NCCIH it can weaken birth control pills, warfarin, some antidepressants, some statins, digoxin and transplant and HIV drugs, and combined with antidepressants or other drugs that affect serotonin it can cause serious serotonin-related side effects. It may also be unsafe during pregnancy (NCCIH, St. John's Wort). 5-HTP and L-tryptophan also raise serotonin, so the same caution applies. If you take any prescription medication, talk to your doctor before starting a blend like this.

If poor sleep lasts more than a few weeks, or you snore loudly or wake up gasping, see your doctor rather than adding more supplements.

Where Go Wise Melatonin Sleep Formula fits

Go Wise Melatonin Sleep Formula pairs 10 mg of melatonin with a 905 mg proprietary blend that includes GABA, L-theanine, chamomile, lemon balm, passion flower, hops, St. John's wort, ashwagandha and 5-HTP, plus 1.8 mg of vitamin B6, 17 mg of calcium and 13 mg of magnesium, in 2 veggie capsules. The blend does not list individual amounts. It is designed to support restful sleep and relaxation at bedtime, taken 30 to 60 minutes before bed. Because it contains St. John's wort and 5-HTP, do not use it with antidepressants, MAO inhibitors or other prescription medication without asking your physician first. Every batch is third-party tested by Eurofins for heavy metals and microbial contamination, and it is made in a GMP-certified facility.

Frequently asked questions

How long before bed should I take melatonin?

Most products suggest 30 to 60 minutes before bed, which gives it time to be absorbed. Taking it at the same time each night, with the lights low, tends to work better than taking it at random times.

Can I take melatonin every night?

Short-term use appears to be safe for most adults, according to NCCIH, but long-term safety has not been well studied. If you find you need a sleep aid most nights for more than a few weeks, talk to your doctor.

Does GABA from a supplement reach the brain?

That is still debated. A 2020 systematic review found only very limited evidence that oral GABA improves sleep, so it is best seen as a possible extra rather than the main ingredient.

Is it safe to take a sleep blend with St. John's wort and birth control?

St. John's wort can make birth control pills less effective and interacts with many other drugs. If you use hormonal birth control or take any prescription medication, check with your doctor or pharmacist first.

References

This article is for general information and isn't medical advice. Talk to your healthcare provider before starting a supplement, especially if you are pregnant, nursing or taking other medication.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

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