What is SynBio Ultra Magnesium?
SynBio Ultra Magnesium is a food supplement that supports normal muscle function, nerve signalling, and energy release. Magnesium also contributes to reducing tiredness and fatigue and supports normal psychological function.
Who is SynBio Ultra Magnesium suitable for?
SynBio Ultra Magnesium tablets are suitable for adults, children, and adolescents who want to support muscle, nerve, and overall wellbeing and are able to swallow tablets.
Magnesium supplements are commonly used by people who:
- Experience muscle cramps or spasms
- Feel tired or fatigued
- Are physically active or exercise regularly
- Experience stress or poor sleep
- Have low dietary magnesium intake
How to take SynBio Ultra Magnesium
You should always take SynBio Ultra Magnesium as advised by your pharmacist, and refer to the product leaflet for more information.
For adults and children aged 12 and over
Take 1 tablet daily with water, preferably with or after food.
If you miss a dose
Do not take a double dose. Take the next dose when you remember.
If you take more than the recommended dose
Taking too much magnesium may cause digestive upset. If you take more than the recommended dose and feel unwell, contact 111 for advice.
How to store SynBio Ultra Magnesium
- Store in a cool, dry place
- Store below 25°C
- Keep in the original container
- Keep out of sight and reach of children
- Do not use after the expiry date on the packaging
Side effects
Magnesium is generally well tolerated, but some people may experience:
- Diarrhoea
- Stomach discomfort
- Nausea
If you experience concerning side effects, stop taking the supplement and seek medical advice.
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Our Clinical Authors
This page has been written by a registered UK pharmacist and reviewed by our clinical team to ensure it is accurate, clear and reflects current clinical guidance.
Last medically reviewed: 07 July 2026
Last updated: 07 July 2026