The non-prescription sleep aisle is mostly built on weak evidence, and we sell products in it, so treat this as a document written by an interested party trying to be straight with you. A few ingredients have modest, real support. Most have small, poorly controlled trials with subjective endpoints. One of the most popular has been studied more than any of the others and has produced the most inconsistent results. And we have removed ingredients from our own formulation when the evidence did not hold up, which we think tells you more than any claim we could make.
Key takeaways
- No non-prescription ingredient treats chronic insomnia. CBT-I is first-line, and nothing in this article changes that.
- L-theanine, glycine and saffron have the most defensible support in this category, and "most defensible" is a low bar.
- Valerian is the most studied and the least consistent. Better-controlled trials have largely not reproduced the early positive findings.
- Chamomile has very limited evidence and a strong ritual effect, which is not nothing but is not pharmacology.
- We retired ashwagandha from our formulation, and we treat magnesium as an adjunct rather than a main agent.
First, the thing that actually works
Before any of this: if you have chronic insomnia, meaning poor sleep at least three nights a week for three months or more with daytime consequences, the treatment with the strongest evidence and the most durable results is cognitive behavioural therapy for insomnia. It is first-line in every major guideline, ahead of any medication and far ahead of anything in this article. See CBT-I in South Africa.
Nothing below is a substitute for that. What these ingredients can do is support a wind-down routine for someone whose sleep is disturbed but not disordered, or sit alongside behavioural treatment. That is a genuine but modest role, and we would rather define it accurately than oversell it.
The ingredient-by-ingredient position
L-theanine
An amino acid found in tea. The evidence base is modest and much of it concerns relaxation and subjective anxiety rather than sleep architecture. Trials tend to find people report feeling calmer and sleeping better, without dramatic changes in objectively measured sleep.
That profile fits a specific job, which is why we use it: not sedation, but reducing the cognitive arousal that keeps people awake at bedtime. For the "tired but wired" pattern, that is the relevant target. It is well tolerated and does not cause next-day grogginess.
We include it in our hyperarousal protocol. You can see it in Hyperarousal Support or on its own as L-theanine capsules.
Glycine
An amino acid with a small evidence base, in which participants taking it before bed reported better sleep quality and falling asleep faster. The honest caveats are that the trials are small and the endpoints largely subjective.
It is well tolerated, it is cheap, and the effect people describe is a settling one rather than sedation. We use it as the bedtime step of the protocol, available as glycine bedtime powder.
Saffron
The one that surprises people. Standardised saffron extract has accumulated a reasonable set of randomised trials for sleep quality and mood, and within this category it stands up better than most. It is in our formulary as part of the hyperarousal protocol, taken earliest in the evening.
Valerian
The most studied herbal sleep ingredient, and the most disappointing when you read the trials rather than the summaries. Early reviews were relatively favourable. Better-controlled trials have largely failed to reproduce those findings, and results across studies are inconsistent enough that reviewers regularly conclude the evidence does not support a clear effect.
Part of the problem is that "valerian" is not one thing: preparations vary enormously in what they contain, which makes pooling trials close to meaningless.
We do not use it. We are not telling you it does nothing, because the evidence is not clean enough to say that either. We are telling you that after decades of study it has not produced a convincing result, and that is informative.
Chamomile
Very limited evidence, from small trials. What chamomile has going for it is that a warm, caffeine-free drink as part of a consistent wind-down is a genuinely useful behavioural cue, and the ritual may be doing more than the plant.
That is not a criticism. A reliable pre-sleep routine is a real part of behavioural sleep treatment. Just be clear about which part is working.
Ashwagandha
We removed it. It was in an earlier version of our formulation and was retired when we revised the formulary.
We are not going to tell you it is useless, because that is a stronger claim than we can support. What we will say is that when we reviewed the evidence against the standard we hold our own products to, it did not stay in.
Magnesium
We include magnesium glycinate as an adjunct rather than a main agent, and the reason is that the pooled trial evidence is modest and low-certainty. The full picture is in magnesium for sleep, including the numbers.
The three questions to ask about any sleep supplement
Is the claim about falling asleep or about sleep quality? Sleep onset is the easiest outcome to shift and the least informative. Alcohol shortens sleep onset. So does a sedating antihistamine. Neither is good for your sleep.
Are the endpoints subjective or measured? Most trials in this category rely on questionnaires. That is not worthless, since how you feel about your sleep matters, but it is more susceptible to expectation than a measured recording.
What is actually in the product? Herbal preparations vary enormously between manufacturers. Standardised extracts, where the active content is specified, are a meaningfully different proposition from an unspecified powder.
What we will not claim
We sell products in this category, so it is worth stating the boundaries explicitly.
We will not tell you these treat insomnia. They support healthy sleep. That is not legal hedging, it is an accurate description of what the evidence supports.
We will not imply that any non-prescription product is equivalent to a prescribed medicine. It is not, and suggesting otherwise would be dishonest.
We will not tell you that our formulation is the strongest available. It is a considered selection of ingredients with the best evidence in a category where the best evidence is still modest.
And we will not tell you that a supplement is the answer if your problem is chronic insomnia, sleep apnoea, restless legs, a delayed body clock or depression. Those are different problems, and the assessment exists to tell you which one you have.
Frequently asked questions
Do herbal sleep aids actually work? A few have modest support, notably L-theanine, glycine and saffron, and the category as a whole rests on small trials with largely subjective endpoints. None treats chronic insomnia, and none is a substitute for CBT-I. They can play a supporting role in a wind-down routine.
Does valerian root work for sleep? It is the most studied ingredient in this category and the most inconsistent. Early reviews were more favourable than better-controlled trials have since supported, and preparations vary so much that pooling studies is difficult. We do not use it.
Is L-theanine or magnesium better for sleep? They do different things and neither has strong evidence. L-theanine targets cognitive arousal, the racing-mind pattern, and its evidence sits more in relaxation than in measured sleep. Magnesium's pooled evidence is modest and low-certainty. We use both, with magnesium as the adjunct.
Are natural sleep aids safer than sleeping tablets? Generally better tolerated, with less next-day impairment and no dependence pattern, which is a real advantage. "Natural" does not mean inert, though: interactions are possible, sedative effects add up with alcohol or other sedatives, and pregnancy and breastfeeding warrant medical advice before taking anything.
Should I take a supplement or see a doctor? If your sleep has been poor for three months or more with daytime consequences, see someone, because that is chronic insomnia and it has a treatment that works. If you snore, stop breathing, or are heavily sleepy in the day, see someone sooner, since those point elsewhere entirely.
This article is educational and is not a diagnosis or a substitute for medical advice. Slumbr's non-prescription products support healthy sleep and are not treatments for insomnia. Speak to a doctor before starting any supplement in pregnancy, while breastfeeding, or alongside regular medication. Slumbr does not provide emergency care.
Not sure whether a supplement is the right tool for your pattern? Take the free Slumbr Sleep Pattern Assessment™ to find out which sleep pattern you have and what actually treats it.