If you have searched for melatonin in the UK and found only overseas sellers, there is a straightforward legal reason.
Can you buy melatonin over the counter in the UK?
No. Melatonin is classified as a prescription-only medicine in the UK and cannot legally be included in a food supplement sold here.
This differs sharply from the United States, where melatonin is regulated as a dietary supplement and sold openly in pharmacies and supermarkets. Same molecule, different regulatory category. UK products offering melatonin online are typically shipping from overseas, outside UK medicines rules — which also means no UK oversight of dose accuracy or purity.
What UK night-time supplements contain instead
UK formulations are built from three legal categories: botanicals, amino acids, and vitamins and minerals. Only the third group can carry authorised claims.
- Botanicals — tart cherry, ashwagandha, passion flower, chamomile, lemon balm, lavender. Legally, no health claims may be made for any of them, so an honest label names them and gives the dose.
- Amino acids — L-theanine and L-taurine are common inclusions.
- Vitamins and minerals — this is where authorised claims live. Niacin, pantothenic acid, vitamin B6 and biotin carry claims covering psychological function, nervous system function and the reduction of tiredness and fatigue.
Why no UK supplement can claim to help you sleep
There is no authorised "sleep" claim for these ingredients under UK and EU law. A brand promising sleep from a botanical blend is making a claim it cannot support legally. The useful things a label can honestly give you are exact ingredients, exact doses, and which nutrients carry regulator-assessed claims.
Our BioSnooze is built on that basis: six herbals with every dose declared — 350mg Montmorency tart cherry, 250mg KSM-66® ashwagandha, passion flower, chamomile, lemon balm and lavender — plus two amino acids and five nutrients. No melatonin, because it cannot legally be there. Vegan, halal and kosher approved, in an HPMC capsule.
Traditional herbal medicines are a different route
Products such as Kalms Night and Nytol Herbal hold THR registration — Traditional Herbal Registration — which permits specific wording based on traditional use. They are typically single or dual-herb valerian products. That is a separate regulatory pathway from food supplements, not a stronger version of one.
Questions we get asked
Is it legal to import melatonin into the UK for personal use?
Melatonin is a prescription-only medicine here, so buying it from overseas sellers sits outside UK medicines regulation. If you think you need melatonin, speak to your GP — it can be prescribed in the UK where clinically appropriate.
What is KSM-66® ashwagandha?
A branded ashwagandha extract (Withania somnifera) made from the root only. Named branded extracts let you verify what you are getting; unnamed "ashwagandha extract" does not.
Is magnesium good for sleep?
Magnesium carries authorised claims relating to normal muscle function and the reduction of tiredness and fatigue — but only at 15% NRV or above. Below that threshold no claim may legally be made, which is why dose transparency matters more than the ingredient appearing on the front of the pack.
Food supplements should not be used as a substitute for a varied diet and healthy lifestyle. If you have persistent sleep problems, speak to your GP.
