Best magnesium supplement UK: forms, doses and honest notes
What's the best magnesium supplement in the UK?
The best magnesium supplement is the one with a form and dose you will actually take, from a brand that publishes batch tests. Look for at least 200mg of magnesium per serving, check the form (glycinate is gentle, citrate is well absorbed, oxide is cheap but poorly absorbed), and read the approved UK claims: magnesium contributes to normal psychological function, normal nervous system function, normal muscle function and the reduction of tiredness and fatigue. It also pairs well with Vitamin B6, which contributes to normal psychological function.
Magnesium forms explained
| Form | What to know |
|---|---|
| Glycinate | Bound to glycine; popular for evening routines and gentle on the stomach |
| Citrate | Well absorbed; commonly used; can have a laxative effect at high doses |
| Oxide | Cheap and common, but poorly absorbed — you are mostly paying for the label |
| Malate / taurate | Less researched forms, often found in premium blends |
What UK rules let magnesium products claim
| Approved claim | |
|---|---|
| Psychological function | Magnesium and Vitamin B6 both contribute to normal psychological function |
| Nervous system | Magnesium contributes to normal functioning of the nervous system |
| Muscles | Magnesium contributes to normal muscle function |
| Tiredness | Magnesium and B6 contribute to the reduction of tiredness and fatigue |
Where magnesium shows up in our range
| Magnesium per serving | Taken with | |
|---|---|---|
| RELAX capsules | 200mg | Maitake, Ashwagandha, L-Theanine, Vitamin B6 |
| DREAM capsules | 300mg | Red Reishi, Sage, Vitamins B5, B6 and D |
| Liquid RELAX (drink) | 70.5mg per 250ml can | 1,000mg Reishi extract, Ashwagandha, Vitamins B5, B6 and B12 |
The trade-offs
A dedicated magnesium supplement
- Highest dose per serving
- Pick your form (glycinate, citrate)
- Cheapest per mg
- One nutrient only
- No mushroom or botanical blend
A blend with magnesium (Grass & Co.)
- Magnesium with approved claims plus a full formula
- Daytime (RELAX) and evening (DREAM) options
- Published batch certificates
- Less magnesium than a dedicated high-dose product
- More expensive per mg of magnesium
If you want magnesium and nothing else, buy a dedicated glycinate at 300–400mg and check the form, not the price per tablet. If you want magnesium as part of a wind-down or daily formula, blends like RELAX and DREAM carry the same approved claims alongside the rest of the formula.
We do not sell a dedicated magnesium product. If you want the most magnesium for the least money, a dedicated 400mg glycinate from any reputable UK brand beats our blends on dose and price.
Mentioned in this piece
Questions people ask
- Which magnesium form is best?
- Glycinate and citrate are absorbed better than oxide. Glycinate is popular in the evening; citrate is common generally. Whichever you pick, check the elemental magnesium per serving.
- How much magnesium should I take?
- UK supplements typically provide 200–400mg per day. Follow the label on your product and check with your GP if you take medication or have kidney problems.
- Should magnesium have Vitamin B6 with it?
- It is a common pairing because both contribute to normal psychological function and to the reduction of tiredness and fatigue.
More comparisons
- The can aisleFunctional drinks compared: Grass & Co., TRIP, Neutonic and Water Junkie
- The label questionFruiting body vs mycelium
- The format questionCapsules vs powder vs drinks
Grass & Co. products are food supplements and are not intended to diagnose, treat, cure or prevent any disease. Do not exceed the stated dose. Most products are for adults; CBD is for adults only.