A good night's sleep affects almost everything, from your mood and focus to your energy, recovery and immune health. Yet millions of people in the UK struggle to fall asleep, wake during the night or feel tired even after a full night in bed.
The foundation of better sleep is always a healthy routine, but the right supplement can offer extra support. In this guide, we look at the best supplements for sleep, how they work and how to choose the right one for you.
How much sleep do you need?
Most adults need between 7 and 9 hours of sleep a night. Teenagers and children need more. If you regularly sleep less than this, or wake up feeling unrefreshed, it may be time to look at your sleep habits and what you can do to improve them.
1. Magnesium
Magnesium is one of the most popular supplements for sleep, and for good reason. This mineral helps relax muscles, supports normal nervous system function and contributes to a reduction in tiredness and fatigue.
Many people do not get enough magnesium from their diet. Magnesium glycinate and magnesium bisglycinate are often recommended for evening use because they are gentle on the stomach and well absorbed.
Not sure which form to choose? Our guide on which type of magnesium is best explains the differences. You can also browse magnesium and other minerals in our single minerals collection, or try a relaxing magnesium drink from Natural Vitality.
2. L theanine
L theanine is an amino acid found naturally in green tea. It is known for promoting a calm, relaxed state of mind without making you feel drowsy during the day.
Because it helps quieten a busy mind, L theanine is popular with people who find it hard to switch off at night. It is often combined with magnesium in evening formulas. Explore calming options in our mood enhancement range.
3. Valerian root
Valerian is a herb that has been used for hundreds of years to support relaxation and sleep. In the UK, some valerian products are registered as traditional herbal remedies to help relieve sleep disturbances caused by mild anxiety.
Valerian can make you feel drowsy, so avoid driving or alcohol after taking it, and check with your GP or pharmacist if you take other medicines.
4. Chamomile and lavender
Chamomile and lavender are gentle, natural options many people enjoy as part of a bedtime routine. A warm cup of chamomile tea or a lavender capsule can be a soothing way to signal to your body that it is time to wind down. Find more plant based options in our herbal supplements collection.
5. Glycine
Glycine is an amino acid that plays a role in calming the nervous system. Some small studies suggest that taking glycine before bed may help people fall asleep faster and feel more alert the next morning. It has a mildly sweet taste and is easy to mix into a drink.
6. Ashwagandha
Ashwagandha is an adaptogenic herb traditionally used to help the body cope with stress. Because stress is one of the most common reasons for poor sleep, some people find it helpful in their evening routine.
Ashwagandha is not suitable for everyone. Avoid it if you are pregnant or breastfeeding, have a thyroid or liver condition, or take regular medication, unless your GP says it is safe.
What about melatonin?
Melatonin is a hormone your body produces naturally to control your sleep cycle. In the UK, melatonin is a prescription only medicine, so it is not sold as a supplement in shops. If you think melatonin could help you, speak to your GP, who can decide whether it is right for you.
The good news is that you can support your body's own melatonin production by getting daylight in the morning and keeping your bedroom dark at night.
How to choose the best sleep supplement
Start by thinking about what is affecting your sleep:
- If you feel tense or have restless muscles: magnesium is a good first choice.
- If your mind races at night: L theanine or a calming herbal blend may help.
- If stress keeps you awake: ashwagandha or valerian may be worth considering, with the right precautions.
- If you want a gentle bedtime ritual: chamomile or lavender is a simple place to start.
Always start with the recommended dose on the label, and try one new supplement at a time so you can see what works for you.
Healthy sleep habits that make a difference
Supplements work best alongside good sleep habits:
- Keep a regular schedule: go to bed and wake up at the same time every day, even at weekends.
- Limit caffeine after midday: coffee, tea, energy drinks and some pre workout supplements can stay in your system for hours.
- Put screens away: switch off phones and laptops at least an hour before bed.
- Create a calm bedroom: keep it dark, quiet and cool.
- Move during the day: regular exercise helps you fall asleep more easily, but avoid intense workouts late at night.
- Get morning daylight: natural light early in the day helps set your body clock.
Frequently asked questions
What is the best natural supplement for sleep? Magnesium is one of the most popular natural options because it supports relaxation and normal nervous system function. L theanine and valerian are also widely used.
How long before bed should I take a sleep supplement? Most sleep supplements are best taken 30 to 60 minutes before bed. Always follow the directions on the label.
Can I take magnesium every night? Yes, most healthy adults can take magnesium daily within the recommended dose. Taking too much can cause an upset stomach, so stick to the label.
Are sleep supplements safe with other medicines? Some herbal supplements can interact with medicines, including antidepressants, blood thinners and sedatives. Speak to your GP or pharmacist before combining them.
When should I see a GP about sleep problems? If poor sleep lasts for several weeks, affects your daily life, or you snore loudly and wake up gasping, speak to your GP.
Final thoughts
The best supplements for sleep are the ones that match the reason you are struggling to rest. Magnesium, L theanine, valerian, chamomile, glycine and ashwagandha each support sleep in a different way, and they work best alongside a consistent routine.
If you are pregnant, breastfeeding, take regular medication or have a health condition, check with your GP before trying a new supplement. When you are ready, explore our full range of trusted products at Modflex, or read our beginner guide on what supplements you should take.