Are Magnesium Gummies Safe for Kids? What Parents Should Know (UK)

Are magnesium gummies safe for kids?

Gummies designed for children, used at the dose on the label and for the age shown, are generally safe for healthy children. Many children’s magnesium gummies are labelled for ages 4 and over. The main side effects of too much magnesium from supplements are diarrhoea, feeling sick and stomach cramps.

Safety depends on four things more than the gummy itself:

• The dose: how much magnesium your child gets from all supplements added together, compared with the upper limit for their age (see the table below).
• Your child’s health: children with kidney problems shouldn’t take magnesium supplements unless a doctor advises it, because their kidneys may not clear it properly. If your child takes any medicine, ask a pharmacist first.
• What else is in it: herbs, extra vitamins and minerals, or, in some products bought online, melatonin, which is a prescription-only medicine in the UK.
• Where it’s kept: gummies look and taste like sweets, so a child who finds the tub may eat the lot.

Never give a child adult magnesium products. They contain more magnesium per serving and may include herbs or other ingredients that aren’t suitable for children. For the bigger picture on children’s magnesium, from food to signs of low levels, see our main guide to magnesium for kids.

How much magnesium do children need?

The UK reference nutrient intakes (RNIs) below are the amounts that meet the needs of nearly all children in each age group, from their whole diet. Separately, the European Food Safety Authority (EFSA) sets a tolerable upper intake level for magnesium from supplements, fortified foods and water. That limit doesn’t include the magnesium naturally present in food, which isn’t a concern.

The upper limit is a ceiling, not a target, and the UK hasn’t set its own upper limit for children. Notice that from age 4 the supplement limit is the same as for adults, even though a 4 year old needs less than half the magnesium an adult does. So the realistic risk isn’t one gummy a day: it’s doubling up on several products, or a child helping themselves to a handful.

Here’s how the maths works with an example. If a children’s gummy gave 50mg of magnesium and the daily serving for a 5 year old was 2 gummies, that’s 100mg from supplements, well within the 250mg limit. If the same child ate 6 gummies, that’s 300mg, over the limit, and diarrhoea and tummy ache become more likely. Always add in any magnesium from multivitamin gummies too. More on what too much does in magnesium side effects.

Do children need magnesium gummies?

Most don’t. The NHS recommends vitamin supplements containing vitamins A, C and D for children aged 6 months to 5 years, but magnesium isn’t on the list of routine supplements for children. A varied diet with wholegrains, beans, nuts, vegetables and dairy usually covers a child’s needs, and the everyday foods children already eat add up quickly:

Figures are worked out from US Department of Agriculture food data, so UK brands will vary a little. A day of porridge made with milk, a wholemeal peanut butter sandwich, a banana, baked beans, some broccoli and a glass of milk comes to roughly 225mg: nearly double what a 4 to 6 year old needs. Swapping white bread, pasta and rice for wholegrain versions is the easiest way to add more. There are more ideas in foods high in magnesium.

A supplement may make sense if your GP or a dietitian finds your child’s intake is low, for example because of a very restricted diet or a condition that affects absorption. In that case, follow their advice on the product and dose rather than picking a gummy off the shelf.

Do magnesium gummies help kids sleep?

Sleep is the main reason parents search for kids’ magnesium gummies, and the honest answer is that there’s no good research showing magnesium helps healthy children sleep better. The studies on magnesium and sleep have mostly been in adults, often older adults, with mixed results; see magnesium for sleep for what they found.

Some parents feel bedtime is calmer with a gummy, but that may simply be the routine of doing the same thing each night. The NHS advice for young children’s sleep is about routine rather than supplements: a calm, predictable bedtime routine at the same time each night, starting to wind down about 30 minutes before your child usually falls asleep, and no tablets, phones or laptops in the 30 to 60 minutes before bed. Your health visitor can help with more advice, and may suggest a children’s sleep clinic if there’s one locally.

People also ask how long kids’ magnesium gummies take to work. As there’s no evidence they improve sleep in healthy children, there’s no reliable timeline to give. If your child is low in magnesium because of a medical condition, your GP will tell you what to expect; for adults, see how long magnesium takes to work.

If your child regularly struggles to fall asleep, wakes a lot, snores loudly, or is tired and irritable in the day, talk to your GP. Sleep problems in children have many possible causes, from worries to snoring and sleep apnoea, and some are linked to conditions such as ADHD (see ADHD and sleep). Waking screaming in the night is covered in night terrors.

Melatonin in kids’ gummies: a UK warning

In the UK, melatonin is a prescription-only medicine. It’s licensed for specific sleep problems, and in children it’s only used for certain conditions, such as insomnia in 6 to 17 year olds with ADHD, when other approaches haven’t worked. It can’t legally be sold as a food supplement here. More in melatonin in the UK.

That matters for magnesium gummies because:

• A UK case in 2025. In August 2025 the Medicines and Healthcare products Regulatory Agency (MHRA) told parents to stop using one brand of children’s magnesium glycinate gummies, sold online for ages 4 and up. Testing found 1.5mg to 1.7mg of melatonin in each gummy, and melatonin wasn’t listed anywhere on the pack. The MHRA had the product removed from online marketplaces and asked parents to take any left over to a pharmacy for disposal.
• US sleep gummies often contain it. In the US, melatonin is sold as a dietary supplement and is widely available over the counter, so children’s “sleep” or “calm” gummies bought from US sellers online may combine magnesium with melatonin.
• Children’s melatonin poisonings are rising in the US. Reports to US poison centres of children swallowing melatonin rose by 530% between 2012 and 2021, and hospital admissions rose too, mainly because of accidental swallowing by children aged 5 and under.

So buy from an established UK retailer, read the full ingredients list, and don’t give your child any product listing melatonin unless it has been prescribed. If you think your child has had a reaction to a supplement, stop giving it, speak to a pharmacist or GP, and report it through the MHRA Yellow Card scheme.

The downsides of gummies

• Sugar: many gummies are made with sugar or glucose syrup. The NHS says sugar is one of the main causes of tooth decay and suggests no more than 14g of free sugars a day at age 2 to 3, 19g at 4 to 6 and 24g at 7 to 10. Check the sugar per serving, and avoid giving a sugary gummy after teeth have been brushed at night.
• Sweeteners that loosen stools: “sugar free” gummies often use polyols such as sorbitol, maltitol or erythritol. In the UK, foods with more than 10% added polyols must say that “excessive consumption may produce laxative effects”. Combined with magnesium, which can also loosen stools, that can mean tummy trouble.
• They look like sweets, so children may eat more than they should (see what if my child eats too many?).
• Low or uneven doses: gummies can’t hold much magnesium, so you may need several a day, and amounts can vary between gummies.
• Additives: some contain colours, flavourings or gelatine (not suitable for vegetarians or some faiths).
• Choking: chewy gummies can be a choking risk for young children, which is one reason many are labelled for ages 4 and up.
• Cost: they’re usually more expensive per mg of magnesium than liquids or powders.

Gummies can teach children that supplements are treats. Some parents find it helps to call them “medicine”, give them at the table, and never as a reward.

How to choose magnesium gummies for kids

iIf your GP or pharmacist agrees a supplement is worthwhile, these are the things to check on the label:

For a closer look at the two most common forms, see glycinate vs citrate vs threonate and magnesium citrate. Magnesium sprays and lotions are also sold for children’s sleep, but little is absorbed through the skin; see does magnesium spray work?

Evopure’s magnesium products are made for adults only and aren’t suitable for children. CBD gummies aren’t suitable for children either; see CBD for kids.

What the health claims on the pack mean

In Great Britain, a food supplement can only make health claims that appear on the GB nutrition and health claims register, worded as authorised. For magnesium, these include that it contributes to a reduction of tiredness and fatigue, normal muscle function, normal functioning of the nervous system, normal psychological function and the maintenance of normal bones and teeth.

These are claims about magnesium’s general role in the body for everyone. They don’t mean a gummy will help a child sleep, behave, concentrate or manage any condition, and no magnesium claim on the register says so. If a children’s product promises to fix sleep, tantrums or “focus”, treat that as marketing.

What if my child eats too many?

Eating a few extra magnesium-only gummies usually causes no more than diarrhoea or a tummy ache. But check the pack in case it contains other ingredients such as iron, vitamin D or melatonin, which can be more serious in large amounts. Children with kidney problems are at more risk from extra magnesium.

What to do, based on NHS advice on poisoning:

• If you’re not sure whether it’s harmful, call NHS 111 for advice. Have the packet to hand and a rough idea of how many are missing.
• Call 999 or go to A&E if your child is very drowsy, floppy, has a fit, or is struggling to breathe, or if you think they’ve swallowed something harmful.
• Don’t try to make them sick, and don’t give them anything to eat or drink.
• Take the packaging with you to hospital so staff can see exactly what was in it.

This happens more than you might think. One US regional poison centre logged 1,143 calls about children swallowing gummy vitamins, supplements or medicines over 3 years. The typical child was 3 years old and only 7% had symptoms, but children who had eaten melatonin gummies were about 8 times more likely to have symptoms, and nearly 5 times more likely to end up in A&E, than those who had eaten other gummies.

Storing them safely: keep all supplements, including your own, in a high or locked cupboard, out of sight and reach, with the lid on tight. Don’t leave a tub on the kitchen worktop or a bedside table, and don’t call them sweets.

When to see a GP

iSpeak to your GP, rather than reaching for a gummy, if your child has:

• Ongoing sleep problems that affect their days, or loud snoring or pauses in breathing at night.
• Constipation. Some forms of magnesium act as laxatives, but children’s constipation should be checked by a GP first; see magnesium and children’s constipation.
• Behaviour, attention or anxiety worries, including possible ADHD. Magnesium isn’t a treatment for these; your GP can refer you for assessment and support. What the research does and doesn’t show is summarised in magnesium and ADHD.
• Signs of low magnesium such as tiredness, weakness or muscle cramps alongside a long-term health condition or very restricted diet.
• Kidney problems or regular medicines, before any supplement.

iA pharmacist is also a good, quick place to ask whether a specific product suits your child.

Better first steps for sleep and calm

• A regular bedtime and wake time, including at weekends
• A calm wind-down routine of about 30 minutes: bath, pyjamas, teeth, story, lights low
• No screens in the 30 to 60 minutes before bed
• A dark, quiet, cool bedroom
• Plenty of daylight and activity during the day
• Time to talk about worries earlier in the evening, not at lights out
• Magnesium-rich meals such as porridge, beans and wholemeal toast

iMost of these help adults too; see sleep hygiene. If problems continue, your GP or health visitor can help.

All Evopure products are for adults (18+) only. Keep any supplement, gummies especially, out of children’s reach.

Related guides

• For one brand’s adult and children’s magnesium gummies, see Bioglan magnesium.
• For the label facts on one popular children’s gummy, see Novomins Kids Magnesium Gummies, with 60mg of magnesium per gummy.
• US adult sleep gummies such as Lemme Sleep contain melatonin and are labelled not for under-18s.