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Magnesium is probably the most underrated supplement you can take. Most people in the UK are not getting enough from their diet, and the difference it makes to sleep, recovery, and overall wellbeing is something I noticed within days of starting.
I have bought magnesium supplements five times now — that is not a typo. It is the one supplement I would recommend to literally everyone, whether you train or not. Here is everything you need to know about choosing the right one in the UK.
My Top Pick (Quick Answer)
If you just want the answer: Nutrition Geeks Magnesium Glycinate 3-in-1. I have bought it five times, it is Amazon Choice with nearly 30,000 reviews, and over 100,000 people bought it last month alone. It works, it is affordable, and I trust it completely.
Want the full breakdown? Keep reading.
Why Magnesium Matters (Especially for Gym-Goers)
Magnesium is involved in over 300 biochemical reactions in your body. For people who train, the key benefits are:
- Muscle recovery: Magnesium helps muscles relax after contraction. Low magnesium = more cramps, tighter muscles, slower recovery
- Sleep quality: This is the big one for me. Magnesium before bed noticeably improves how quickly I fall asleep and how rested I feel in the morning
- Energy production: It plays a direct role in converting food into ATP (energy your muscles use)
- Reduces tiredness: Officially recognised by the EU for contributing to the reduction of tiredness and fatigue
- Nervous system: Helps with stress and anxiety management
- Protein synthesis: Directly involved in the process of building muscle
The NHS estimates that a significant portion of the UK population does not meet the recommended daily intake of magnesium. If you train hard and sweat regularly, you are losing magnesium through sweat, making supplementation even more important.
Best Magnesium Supplements UK — Ranked
1. Nutrition Geeks Magnesium Glycinate 3-in-1 — Best Overall
My Experience (Purchased 5 Times): This is the magnesium supplement I keep buying and will continue buying. The 3-in-1 formula combines three forms of magnesium — glycinate (1000mg), citrate (400mg), and malate (400mg) — for a total of 1800mg per capsule with 384mg elemental magnesium.
The difference I notice when taking this consistently versus not taking it is night and day. My sleep is deeper, I fall asleep faster, and I wake up feeling genuinely rested. Recovery between training sessions also feels noticeably better.
Key Details:
- Total magnesium: 1800mg (384mg elemental)
- Forms: Glycinate + Citrate + Malate
- Capsules: 90 per bottle (3 month supply at 1/day)
- Price: Around £7.64
- Rating: 4.4 stars from 29,700+ reviews
- Amazon Choice — 100K+ bought in past month
- Vegan, UK made
Why it is number one: The triple-form formula means better absorption than single-form supplements. At under £8 for a 3-month supply, the value is unbeatable. And with 100,000+ people buying it monthly, this is clearly the UK favourite for a reason.
2. BetterYou Magnesium Body Spray — Best Topical Option
Overview: If you struggle with taking tablets or want targeted relief for sore muscles, BetterYou magnesium spray is applied directly to the skin. It absorbs transdermally, bypassing the digestive system entirely.
Key Details:
- Type: Topical magnesium chloride spray
- Application: Spray directly onto skin (legs, arms, shoulders)
- Price: Around £10-12 per bottle
- Rating: 4.4 stars from thousands of reviews
- UK brand, widely available
Best for: People who dislike swallowing capsules, targeted muscle soreness, or as an addition to oral magnesium.
3. Solgar Magnesium Citrate — Best Premium Tablets
Overview: Solgar is a well-respected supplement brand known for high quality. Their magnesium citrate tablets are a solid choice if you prefer a single-form magnesium from a trusted name.
Key Details:
- Magnesium: 200mg elemental per tablet
- Form: Magnesium citrate
- Tablets: 120 per bottle
- Price: Around £12-15
- Trusted premium brand
Best for: People who prefer established premium brands and are happy to pay a bit more for the name.
4. Bulk Magnesium Bisglycinate — Best from Bulk
Overview: Bulk (formerly BulkPowders) offers a no-frills magnesium bisglycinate at a competitive price. Good option if you already order from Bulk for your protein.
Key Details:
- Form: Magnesium bisglycinate
- Good absorption rate
- Competitive UK pricing
- UK brand with transparent labelling
5. Holland & Barrett Magnesium — Best High Street Option
Overview: If you want to pick something up in person today, Holland and Barrett is the most accessible option on the UK high street. Their magnesium range is decent, though typically pricier per serving than online options.
Best for: People who prefer buying in-store and want something immediately. Just be aware you will usually pay more than ordering online.
Types of Magnesium Explained
This is where most people get confused. There are many different forms of magnesium, and they are not all equal.
| Type | Absorption | Best For | Notes |
|---|---|---|---|
| Magnesium Glycinate | ⭐⭐⭐⭐⭐ Excellent | Sleep, recovery, daily use | Most recommended form, gentle on stomach |
| Magnesium Citrate | ⭐⭐⭐⭐ Very Good | General supplementation | Good absorption, can have mild laxative effect |
| Magnesium Malate | ⭐⭐⭐⭐ Very Good | Energy, muscle pain | Good for fatigue and fibromyalgia |
| Magnesium Taurate | ⭐⭐⭐⭐ Very Good | Heart health | Contains taurine, good for cardiovascular support |
| Magnesium Oxide | ⭐⭐ Poor | Laxative | Cheap but poorly absorbed — AVOID for supplementation |
| Magnesium L-Threonate | ⭐⭐⭐⭐ Very Good | Brain health | Crosses blood-brain barrier, expensive |
The key takeaway: Avoid magnesium oxide. It is the cheapest form and found in many supermarket supplements, but your body absorbs very little of it. Glycinate, citrate, and malate are all good choices — which is why I like the Nutrition Geeks 3-in-1 that combines all three.
How Much Magnesium Do You Need?
| Group | UK RDA | Optimal for Athletes |
|---|---|---|
| Men (19-64) | 300mg/day | 400-500mg/day |
| Women (19-64) | 270mg/day | 350-450mg/day |
Most magnesium supplements provide 200-400mg of elemental magnesium per serving. Combined with what you get from food (dark chocolate, nuts, spinach, avocado), one serving per day is usually enough.
When to Take Magnesium
Before bed is the best time. Magnesium has a calming effect on the nervous system that promotes relaxation and sleep. I take mine about 30 minutes before I want to sleep and the difference is noticeable.
You can also take it with food if you find it easier to remember. Taking magnesium with food can also reduce any chance of mild stomach discomfort, though glycinate is very gentle regardless.
Signs You Might Be Low in Magnesium
- Muscle cramps or twitches (especially at night)
- Poor sleep quality or difficulty falling asleep
- Feeling tired despite getting enough sleep
- Increased stress or anxiety
- Headaches
- Slow recovery from training
If any of these sound familiar, magnesium supplementation could make a genuine difference. It did for me.
Frequently Asked Questions
Can you take too much magnesium?
The upper tolerable limit from supplements is generally considered to be 400mg of elemental magnesium per day. Taking too much can cause loose stools or diarrhoea — this is your body telling you to reduce the dose. Start with one capsule and see how you respond.
Is magnesium glycinate better than citrate?
Both are well-absorbed. Glycinate is gentler on the stomach and has more calming/sleep benefits. Citrate is slightly cheaper but can have a mild laxative effect in some people. For most gym-goers, glycinate is the better choice.
Can I get enough magnesium from food?
In theory yes, but in practice most people do not. You would need to eat significant amounts of dark leafy greens, nuts, seeds, and dark chocolate daily to meet the RDA. A supplement is a simple, cheap insurance policy.
Does magnesium help with muscle cramps?
Yes. Magnesium deficiency is one of the most common causes of muscle cramps. Supplementing can significantly reduce nighttime cramps and post-exercise muscle tightness.
Can I take magnesium with other supplements?
Yes. Magnesium works well alongside most other supplements. I take it as part of my daily stack which includes protein, creatine, vitamin D, B-complex, krill oil, and collagen. No interactions to worry about for healthy adults.
My Final Recommendation
If you are only going to add one new supplement to your routine, make it magnesium. The impact on sleep alone makes it worth every penny — and at under £8 for three months, there is no excuse not to try it.
My pick: Nutrition Geeks Magnesium Glycinate 3-in-1. Five purchases and counting. It is cheap, effective, and the 3-in-1 formula covers all your bases.
Read more:
- My Complete Daily Supplement Stack
- Creatine Monohydrate: Complete Beginner Guide
- Best Whey Protein UK 2026
- How Much Protein Do You Need Per Day?
Last updated: March 2026. Prices may vary. I have purchased the top-recommended product five times with my own money.