Why Is Melatonin Banned in the UK? Medicines Explained

Melatonin isn’t actually banned in the UK — but it can’t be sold over the counter like it is in countries such as the USA. In the UK, melatonin is classed as a prescription-only medicine, meaning you can only get it legally if it’s been prescribed by a doctor.

This regulation is in place not because melatonin is considered dangerous, but because the Medicines and Healthcare products Regulatory Agency (MHRA) treats it as a substance that requires medical supervision.

What Is Melatonin?

Melatonin is a naturally occurring hormone produced by the brain, mainly at night, that helps regulate your sleep-wake cycle. Synthetic melatonin is commonly used to help with insomnia, jet lag, and sleep disorders.

In some countries — particularly the USA — it’s widely available as a dietary supplement, sold in tablet, gummy, or liquid form. However, the UK takes a more cautious, clinical approach.

Why Is Melatonin Restricted in the UK?

The UK government considers melatonin a medicinal product rather than a supplement. There are several reasons for this:

• Regulation of strength and quality – Over-the-counter supplements may vary in dosage and purity, and the MHRA prefers to monitor consistency.

• Appropriate use – Melatonin is most effective when used at the right time and dose. Used incorrectly, it can disrupt sleep patterns or have little effect.

• Underlying health conditions – Sleep problems may signal broader medical issues. Requiring a prescription ensures people are properly assessed.

In short: melatonin is not banned, but it's controlled to ensure it's used safely and effectively.

How Can You Get Melatonin in the UK?

You can be prescribed melatonin if you have:

• Persistent insomnia that hasn’t responded to other treatments

• Sleep problems related to ADHD or autism (especially in children)

• Jet lag or shift work disorder, under specific circumstances

Doctors usually prescribe Circadin, a 2mg modified-release melatonin tablet that mimics the body’s natural release pattern.

If you're travelling from abroad, bringing small amounts of melatonin into the UK for personal use is generally allowed, but it must be for your own use and should be declared if required.

Are There Any Alternatives?

If you’re struggling with sleep, your doctor may suggest:

• Sleep hygiene changes – like reducing screen time before bed or sticking to a routine

• Cognitive Behavioural Therapy for Insomnia (CBT-I)

• Other medications, depending on the cause of your sleep issue

You can also try over-the-counter herbal remedies like valerian root or magnesium — but consult a pharmacist first.

Final Thought

Melatonin isn’t banned in the UK — but it is prescription-only. This is mainly to ensure quality control and proper medical use. If you’re struggling with sleep, it’s always best to speak to your GP, who can advise you on the safest and most effective treatment for your needs.