Walk down the sleep aisle and the labels can look bewildering. This guide explains, in plain English, the ingredients you'll most often find in UK natural sleep supplements — what they are, and what the law does and doesn't allow us to say about them.
I'm Barry Lees, founder of The Health Improvers. This is educational information, not medical advice or a treatment claim.
Vitamins and minerals (with authorised EU/UK claims)
Some nutrients carry official, approved health claims when present in a meaningful amount. In sleep-and-calm formulas you'll commonly see:
- Niacin (Vitamin B3) — contributes to normal psychological function and to the reduction of tiredness and fatigue.
- Biotin — contributes to normal psychological function and the normal functioning of the nervous system.
- Pantothenic Acid (Vitamin B5) — contributes to normal mental performance and to the reduction of tiredness and fatigue.
- Vitamin B6 — contributes to normal psychological function, the normal functioning of the nervous system and the regulation of hormonal activity.
- Magnesium — contributes to normal psychological function, the normal functioning of the nervous system and the reduction of tiredness and fatigue (when present at the required level per serving).
These are the claims a UK supplement is actually allowed to make — note they're about normal psychological function, the nervous system and tiredness, not about “curing” sleeplessness.
Traditional herbal ingredients
Many formulas also include botanicals with a long history of traditional use in evening and bedtime blends. Under food-supplement rules these are named, not claimed — so we can tell you they're present, but not attach a health claim to them. Commonly used examples include:
- Valerian root
- Chamomile
- Hops
- Lemon balm
- Passionflower
If a product makes bold botanical “knock you out” style promises, treat that as a red flag — it isn't compliant with UK rules.
What about melatonin?
You'll see melatonin sold freely in the US, but in the UK it is a prescription-only medicine — it is not legally sold as an over-the-counter food supplement here. If a UK site is selling melatonin without a prescription, be cautious.
How to read a sleep-supplement label
Check the amount per serving (not just per 100g), look for the %NRV on vitamins and minerals, check the botanical amounts, and look for allergens, vegan status and where it's made. For a step-by-step on comparing products, see our honest comparison of UK sleep aids for 2026.
Putting it together
A well-formed sleep supplement pairs meaningful levels of the claimable nutrients with traditional herbal ingredients, and is honest about what it can say. Our own Deepest Sleep follows that approach. And remember — ingredients work best alongside good habits; see our evidence-based sleep hygiene guide.
Written by Barry Lees, founder of The Health Improvers. This article is for general information and education only. It is not medical advice and does not diagnose, treat or prevent any condition. Food supplements are not a substitute for a varied diet and healthy lifestyle. Always read the label. If you are pregnant, breastfeeding, taking medication or have a health condition, consult a healthcare professional before taking supplements.
Sources: GB Nutrition and Health Claims Register; NHS — Melatonin; Medicines and Healthcare products Regulatory Agency (MHRA).
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