Viridian Magnesium Review UK 2026

Viridian magnesium earns its clean-label reputation: the bisglycinate SKU delivers 200mg elemental magnesium in a two-ingredient formula with verified ethical credentials. The label says '100% active' - most buyers read that and move on, reassured. What it actually means - and more importantly, what it does not mean - is a more useful question than the brand usually answers.

I am a registered Nutritional Therapist holding a Diploma in Nutritional Therapy from the College of Naturopathic Medicine, with clinical experience spanning the nutrition programme at Google DeepMind through The Kyros Project and The Wellness Clinic at Harrods. Magnesium is one of the most common deficiencies I see in clinic, and the form and dose you choose matter considerably more than most labels suggest. Viridian comes up often with clients who shop in independent health-food stores and want a clean option with clear ethics. This is my honest assessment of what the brand delivers.

For a broader comparison of the best magnesium supplements UK buyers can buy in 2026, including options across price brackets, read our full roundup.

Viridian's magnesium range earns its clean-label reputation. The '100% active' claim is legitimate - the capsule contains only the active compound and the vegetarian capsule shell, no bulking agents, binders, palm oil, or synthetic additives. If you have experienced unexplained reactions to supplements before, a formula this minimal is worth the extra cost.

The range splits into two meaningfully different products. The High Potency Magnesium (300mg) is a citrate-based blend; the High Potency Magnesium Bisglycinate delivers 200mg elemental magnesium bound to glycine. Both are solid options. The right one depends on your digestion and your goal.

Overall rating: 4.3 / 5

Viridian Nutrition is an independently owned UK supplements brand founded in 1999. It sells exclusively through independent health-food retailers rather than supermarket chains - a deliberate positioning choice that reflects its standing as a practitioner-grade, ethical alternative to mass-market supplements.

The brand holds a consistent set of commitments across its entire range: no additives, fillers, or bulking agents; no palm oil; no artificial colours or preservatives; vegan and cruelty-free formulas throughout. Its Trustpilot profile sits at 3.9 out of 5 across 36 reviews (as of July 2026), with the magnesium bisglycinate product drawing a 4.9 out of 5 rating from 17 direct reviews on the Viridian website.

For UK buyers who value supply-chain transparency and ethical sourcing, Viridian's independent ownership structure and long-standing clean-formulation policy are genuine differentiators. You will not find magnesium stearate buried in the excipient list.

This is the section that matters most if you are evaluating Viridian on its core claims.

The '100% active' claim - what it actually means

Viridian states that every product contains only the active ingredient(s) and the vegetarian capsule shell - no bulking agents, no fillers, no flow agents, no synthetic additives. Verified against the ingredient lists published on viridian-nutrition.com: the High Potency Magnesium Bisglycinate ingredient list reads 'Magnesium Bisglycinate, Vegetarian Capsule (Hydroxypropyl Methylcellulose).' Two ingredients.

The important nuance: '100% active' does not mean 100% elemental magnesium by weight. Magnesium bisglycinate is a chelate - magnesium bound to glycine molecules. The compound weight printed on the label is heavier than the elemental magnesium it delivers. The Bisglycinate SKU delivers 200mg elemental magnesium per serving, which is the clinically relevant figure. The NHS recommends 270mg per day for women aged 19-64 and 300mg per day for men, so a single 200mg serving covers the majority of your daily requirement alongside dietary intake.

The High Potency Magnesium (300mg) uses a citrate-based compound. Magnesium citrate is well-absorbed and also known for a mild laxative effect at higher doses - useful for some buyers, a problem for others. If you are taking magnesium for sleep, muscle recovery, or nervous system support rather than bowel regularity, citrate is not necessarily your best fit.

The High Potency Magnesium Bisglycinate is the gentler option. Magnesium bound to glycine is consistently reported as the better-tolerated form for people with sensitive digestion. The glycine is also mildly calming, which makes bisglycinate the more appropriate choice if sleep support is part of your goal. Our guide to magnesium glycinate vs malate covers the form comparison in more depth if you want to go further into the science.

The European Food Safety Authority has confirmed that magnesium contributes to normal muscle function, the reduction of tiredness and fatigue, and normal psychological function. Form bioavailability is not a marketing claim - it is the mechanism by which the supplement does what it is supposed to do.

If you are comparing Viridian against a wider field, our best magnesium supplement uk roundup covers 12 brands across all price points.

I have recommended Viridian magnesium bisglycinate to clients in my practice and tracked responses over four to six weeks of use. The consistent feedback is that it is one of the gentler options available. No reports of digestive upset at the standard one-capsule dose, which aligns with what the bisglycinate form would lead you to expect clinically.

The capsule size is standard - comparable to most 200mg supplement capsules and straightforward for most adults to swallow. Viridian uses hydroxypropyl methylcellulose for the capsule shell, a plant-derived polymer that is suitable for vegans and free from the gelatin that appears in many mainstream supplement capsules.

I will be honest about the limitation of this evidence here: I am not presenting this as a controlled clinical trial. I am presenting it as a clinician's pattern of observation across a client group who have used this product consistently. Individual responses vary, particularly around tolerability, and these observations were not blinded. What I can say is that the anecdotal tolerance profile of the bisglycinate form is consistent with the mechanism - it is a gentler compound.

For the citrate SKU: if you have any history of irritable bowel syndrome or loose stools, start with bisglycinate. Citrate's laxative effect is a property of the form that some buyers find useful. But knowing in advance is better than discovering it unexpectedly.

The NHS notes that most people can get the magnesium they need through a varied diet, and supplementation is best targeted at those with documented deficiency, absorption difficulties, or high stress loads that deplete the mineral. Viridian's dosing sits within a sensible supplementation range for those who need it.

That is a premium over supermarket-brand magnesium tablets, where £5-£8 can buy you 90 capsules. With Viridian, you are paying for formulation purity (two ingredients, no exceptions), confirmed ethical credentials (vegan, cruelty-free, palm-oil-free, independently owned), and a form of magnesium with clinical support for bioavailability and tolerability.

There is no current Viridian discount code available through authorised stockists. The brand distributes through independent health retailers rather than a single storefront, so comparing prices across stockists is the practical route to best value.

Clean-label coffee connection: If no-additive credentials matter across your daily routine, our guide to the best mycotoxin-free coffee applies the same clean-label lens to your morning cup.

Buy it if you have experienced reactions to supplement additives before and have not been able to identify the cause - the filler-free formulation removes variables. Buy it if you prioritise vegan and ethical credentials in everything you consume. Buy it if you have sensitive digestion and want the bisglycinate form specifically.

Skip it if you are looking for the lowest cost-per-mg of elemental magnesium and have no sensitivity concerns. Skip it if you want a combination formula with added cofactors. Skip it if you need a high-dose magnesium protocol - always consult a healthcare professional before exceeding label dosing.

If you are still deciding between forms, our best magnesium for sleep guide separates the sleep-specific case in more detail.

If you are building a daily wellness stack, our roundup of the best mushroom coffee UK brands covers adaptogens that pair well with a magnesium protocol for stress and sleep support.

Viridian High Potency Magnesium Bisglycinate - recommended starting point for most buyers.

For the bisglycinate SKU directly from the brand: viridian-nutrition.com/products/magnesium-bisglycinate