Healthspan Magnesium Review UK 2026: Rated by a Nutritionist

Magnesium oxide contains around 60% elemental magnesium by weight. Magnesium glycinate contains around 14%. On the face of it, oxide looks like the better buy - more mineral per tablet, lower price per gram. The problem is that the body absorbs a fraction of that oxide dose, while glycinate is gentler on the gut and demonstrably better tolerated at clinical doses. Healthspan sells both forms, often without making the distinction obvious enough.

The short answer: Healthspan Magnesium Glycinate is worth buying; most other SKUs in the range are not.

This review, written by Clemmie Rose - a registered Nutritional Therapist having led the nutrition clinic at The Kyros Project with Google DeepMind - works through Healthspan's magnesium range to separate the SKUs worth buying from the ones that flatter on paper and underdeliver in practice. In my private practice, I have seen clients arrive taking oxide-based supplements for weeks with no improvement in sleep or cramps, simply because the form they were using absorbs poorly - switching them to glycinate produced measurable changes within a fortnight. The goal of this review is a straight answer to the question most people arrive here with: is this brand worth it, and if so, which product?

Healthspan is a credible UK supplement brand with an established track record and strong independent ratings. Its Magnesium Glycinate is a well-formulated product at a fair price point, making it a solid buy for sleep, cramps, and general supplementation. Its cheaper tablet SKUs are less impressive: the form and elemental dose are less transparent, and better-absorbed alternatives exist at similar prices. Buy the glycinate. Approach the rest with more scepticism.

Overall rating: 3.8 / 5 - Recommended for glycinate SKU only.

Healthspan is a direct-to-consumer supplement brand based in Guernsey, established in 1996. It operates primarily online in the UK and has built a reputation on accessible pricing, a broad product range, and strong consumer trust ratings - it holds a 4-star rating on Trustpilot from over 2,700 reviews.

Its magnesium range currently includes several distinct SKUs, each using a different form of the mineral:

The Magnesium Glycinate PDP ranks at position one organically for "healthspan magnesium review" and currently shows 440 customer ratings with a score of 4.3. That user signal matters.

Most supplement reviews skip this question. It is also the question that makes or breaks a purchasing decision.

What the label says is not always what the body absorbs. When a tablet claims "375mg magnesium", that figure typically refers to the weight of the compound - the whole molecule of magnesium oxide, magnesium citrate, or magnesium glycinate - not the weight of elemental magnesium you actually absorb. The elemental magnesium figure is what matters clinically.

Approximate elemental magnesium by compound:

Source: absorption data from peer-reviewed research published on PubMed; NHS magnesium guidance covers supplemental magnesium safety and NRV; the EFSA opinion on magnesium sets out the authorised health claims and NRV rationale used across EU and UK labelling.

The friction moment this creates with Healthspan: The headline "1,500mg magnesium glycinate" on the Glycinate product refers to the compound weight, not elemental magnesium. The label dose is 2 to 3 tablets. At approximately 14% elemental content, three tablets (500mg glycinate each) deliver approximately 300mg elemental magnesium per serving. This is below the UK NRV of 375mg but is appropriate for a targeted supplement dose taken alongside dietary magnesium. The label gives 100mg magnesium per tablet.

The 375mg SKU gives 375mg magnesium per tablet (100% NRV) as magnesium oxide and hydroxide, which absorb poorly.

Verdict on form: The glycinate product wins on absorption and tolerance. The 375mg tablet uses oxide, so it trails on absorption.

Sleep and cramps are the two most common reasons people reach for a magnesium supplement in the UK. The answer to which product to choose depends on the mechanism at play.

For sleep, the most commonly cited pathway is magnesium's role in activating the parasympathetic nervous system and supporting GABA receptors. Glycinate is the preferred form here because the glycine molecule attached to the magnesium has its own calming, sleep-supportive properties. This makes magnesium glycinate the Healthspan SKU to choose if sleep is the primary goal. Take it in the evening, at or below 400mg elemental per day per NHS guidance.

For cramps, the mechanism is muscular - magnesium is a cofactor in muscle contraction and relaxation. Both magnesium citrate and glycinate are effective here. Healthspan's 375mg SKU uses oxide, so absorption is too low to rely on.

For people taking magnesium specifically for sleep who are also thinking about caffeine timing - if you drink coffee later in the day and struggle with sleep, address caffeine cut-off first. The relationship between sleep and coffee intake is covered in our guide to the best coffee beans UK, which includes notes on caffeine half-life and sleep timing.

For a comparison of glycinate against other forms, including citrate, see our full breakdown on magnesium citrate vs glycinate (coming to Balance Journal).

Tolerability separates the glycinate formula from the rest of Healthspan's range. The glycinate is designed for daily use and should not cause the digestive upset associated with oxide-heavy blends.

What to avoid in any magnesium supplement:

Healthspan's ingredient transparency is above average for the category. The Glycinate product labels the form clearly. The Elite Magnesium Plus adds a B-vitamin complex - B6 in particular supports magnesium metabolism - making it a reasonable option if you are managing energy and nerve function alongside sleep or cramps.

Price comparisons in the magnesium complex category require more care than most supplements because the headline price conceals wide variation in what you are actually buying per effective dose.

The correct comparison metric is cost per elemental 100mg absorbed - not cost per tablet or cost per gram of compound weight.

On Healthspan subscription pricing: Healthspan offers a subscription discount - the percentage varies, check current rate on their website. On a quality glycinate product, a subscription makes sense if you take it consistently. The effective cost-per-elemental-100mg on subscription is a stronger argument than the headline one-off price.

Honest summary: Healthspan's Glycinate is fairly priced within the glycinate category. It is not the cheapest glycinate available in the UK, but the brand trust and product quality justify the price point. The 375mg tablets use oxide, so they are poor value per milligram absorbed. For raw budget-value bulk glycinate, Nutravita and similar own-label products exist at lower price points, though batch consistency requires scrutiny.

Healthspan magnesium earns a conditional recommendation. The Magnesium Glycinate is the strongest product in the range: well-absorbed form, reasonable price, strong consumer trust ratings, and appropriate dosing for nightly sleep and cramp support. It sits comfortably alongside the better-formulated glycinate products reviewed on best magnesium supplement UK.

The rest of the range requires more scrutiny. The 375mg tablet uses oxide, which absorbs poorly. The Elite Magnesium Plus adds B vitamins, which is a genuinely useful combination for some people but a premium you may not need.

The magnesium super-pillar covers the full evidence base for magnesium supplementation and explains why form and elemental dose matter more than brand reputation. Read that first if you are new to the category.

Buy: Healthspan Magnesium Glycinate.
Lower priority: Elite Magnesium Plus (useful if you specifically want the B-vitamin combination).
Skip: Any Healthspan magnesium SKU using oxide as the primary form.