Solgar Magnesium Review UK 2026: Is It Worth the Price?
A nutritionist's verdict on dose, sourcing and value for money.
Table of Contents
Some of the links in this article are affiliate links, which help fund our independent review work at no extra cost to you. How we assessed these products is explained in this article and our Editor Lab methodology. No brand pays to appear, and no placement is guaranteed.
Solgar magnesium is a well-formulated, reputable supplement available in three forms: Magnesium Citrate, Magnesium Bisglycinate, and Chelated Magnesium (bisglycinate and oxide blend). The Citrate and Bisglycinate forms are the most relevant for general use.
The honest verdict: Solgar is not the cheapest option on the high street and it is not the most potent per tablet. But the manufacturing standards are consistent, the forms are legitimate (not the poorly absorbed oxide that fills many budget tablets), and the brand has earned its position on the H&B shelf through more than 75 years of supplement production.
The question worth asking before you buy is not whether Solgar is a good brand. It is whether you need Solgar's specific form, at Solgar's price point, or whether a cheaper chelated alternative would deliver the same outcome. This review answers that.
| Criteria | Our Assessment |
|---|---|
| Form quality | Good - Citrate and Bisglycinate are well-absorbed forms |
| Elemental magnesium per tablet | 200mg (Citrate); 120mg per capsule (Bisglycinate) |
| Daily dose | 1 tablet (can take up to 3x daily per label) |
| Tablet size | Large - some users report difficulty swallowing |
| Price per 100 tablets | Around £12-£15 (H&B, Amazon UK) |
| Own-brand comparison | 1.5-2x own-brand price for comparable forms |
| Verdict | Reliable, mid-market choice - best for buyers who value brand consistency over lowest cost |
What Is Solgar Magnesium and Which Forms Are Available?
Solgar is an American supplement brand founded in 1947, now part of Nestle Health Science following the acquisition of The Bountiful Company in 2021. It has been sold in UK health stores, primarily through Holland & Barrett, for decades. The brand's positioning is mid-market: above own-label, below clinical or practitioner-grade brands such as Thorne or Designs for Health.
In the UK, Solgar's magnesium range covers three products:
Solgar Magnesium Citrate (200mg elemental per tablet). The most widely stocked and the most searched product in the range. Magnesium citrate is well-absorbed relative to oxide and is the form most commonly recommended by nutritionists for general supplementation, including support for regularity, muscle function, and energy.
Solgar Chelated Magnesium (100mg elemental per tablet). Uses a blend of magnesium bisglycinate and oxide. The presence of oxide in the blend is a compromise: oxide has low bioavailability, though the bisglycinate component partially offsets this. This is not the same as pure chelated glycinate.
Solgar Magnesium Bisglycinate (120mg elemental per capsule). The premium form in Solgar's range. Bisglycinate (also called glycinate) is widely regarded as the most gentle and highly bioavailable form of magnesium, and is the form most associated with sleep quality and nervous system support. It is less commonly stocked and typically costs more than the Citrate.
The NHS notes that the recommended daily intake for magnesium is 270mg for women and 300mg for men. One Solgar Citrate tablet provides 200mg - a meaningful dose from a single tablet, though most adults with a genuine deficiency will benefit from taking two.
How We Assessed
I reviewed Solgar's magnesium range as part of my clinical work as a BANT-registered Nutritional Therapist who has led nutrition clinics at Google DeepMind's Kyros Project. Over several months, I recommended Solgar Magnesium Citrate and Bisglycinate to clients presenting with symptoms associated with low magnesium: disrupted sleep, muscle cramps, and low energy.
I also compared label data for elemental magnesium content, bioavailability by form, and cost-per-100mg elemental magnesium across Solgar's three products and two UK alternatives at similar price points.
Tablet size was assessed using the H&B and iHerb review corpus (734 and 12,521 reviews respectively). Several reviewers noted the Citrate tablets as 'on the large side' and 'slightly bitter and chalky' - consistent with magnesium citrate's known taste profile. These are not quality defects; they are properties of the compound.
Form, Dose, and Quality: The Honest Assessment
The key quality question with any magnesium supplement is not the brand - it is the form. Magnesium oxide, the cheapest and most common form in budget tablets, has a bioavailability of around 4%, meaning that a 400mg oxide tablet delivers roughly 16mg of usable magnesium. Research published in Magnesium Research by Nielsen and Lukaski (2006) has established magnesium's critical role in energy production and muscle function - the underlying reason that form and dose both matter for anyone supplementing to address these outcomes.
Solgar's Citrate avoids oxide entirely. At 200mg elemental per tablet, with citrate's bioavailability estimated at 25-30%, a single tablet delivers around 50-60mg of absorbable magnesium. That is a meaningfully better outcome than budget oxide tablets marketed at twice the dose.
The Bisglycinate is the strongest form in the range. Glycinate is bound to the amino acid glycine, which improves absorption and reduces the laxative effect that some users experience with citrate at higher doses. A 2019 study published in the journal Nutrients (PMC6683096) on predicting and testing the bioavailability of magnesium supplements found that chelated forms, including bisglycinate, achieved high magnesium release under both fasted and fed conditions, supporting their use where absorption is a priority.
Avoid the Chelated blend if choosing between the three products. The presence of oxide in the blend means the bioavailability is lower than pure citrate or glycinate, and the amino acid chelate content does not fully compensate. If you are choosing between the three Solgar products, the Chelated form is the one I would deprioritise.
Form and Dose Evaluation Table
| Product | Form | Elemental Mg per Serving | Bioavailability Tier | Best For |
|---|---|---|---|---|
| Solgar Magnesium Citrate | Pure citrate | 200mg | Good | General supplementation, regularity |
| Solgar Magnesium Bisglycinate | Pure bisglycinate | 120mg per capsule | Excellent | Sleep, nervous system, sensitive gut |
| Solgar Chelated Magnesium | Bisglycinate + oxide blend | 100mg | Moderate | Not recommended as primary choice |
Which Solgar Magnesium Should You Choose?
The decision is almost always between Citrate and Bisglycinate. Citrate delivers 200mg elemental magnesium per tablet; Bisglycinate delivers 120mg elemental magnesium per capsule. The difference is in what you are trying to achieve and how your gut responds.
For sleep and relaxation support, Bisglycinate is the better choice. The glycine component has a calming effect on the nervous system that goes beyond magnesium alone, and it is the gentlest form on the digestive system. If you are taking magnesium before bed and want to avoid waking in the night with loose stools, Bisglycinate is the form to choose. For a full comparison of these forms, the magnesium citrate vs glycinate guide covers the evidence in detail.
For general supplementation and bowel regularity, Citrate is the standard recommendation. It is well-absorbed, widely available, and the form most studied for general magnesium repletion. It is also what most practitioners mean when they say 'take magnesium citrate.'
If you are undecided on form or want a broader context for the whole category, the magnesium supplement guide covers what the evidence actually supports across all forms and use cases.
Price and Value: Is Solgar Worth It?
This is where the review gets more nuanced.
At around £12-£15 for 60 tablets (Magnesium Citrate, H&B price), Solgar works out at roughly 20-25p per tablet, or around 10-13p per 100mg of elemental magnesium. That is approximately 1.5 to two times the cost of a comparable Holland & Barrett own-brand magnesium citrate, which typically retails at around £8-£10 for a similar count.
The honest comparison is not headline price - it is cost-per-elemental-mg at an equivalent bioavailability tier. If both products are citrate form, with similar elemental doses, the quality gap is narrow. H&B's own-brand magnesium uses citrate, which puts it in the same bioavailability tier as Solgar.
Where Solgar earns its premium:
- Manufacturing consistency. Solgar's production standards are more tightly controlled than most supermarket own-label brands. The brand does not cut corners on excipients or tablet binders in ways that cheaper brands do.
- Third-party identity. Solgar is regularly stocked and reviewed in third-party editorial contexts (Which?, BBC Good Food, iHerb's verified review base) without significant controversy. That is not the case for every high-street supplement brand.
- Form-specific range. Solgar offers genuinely different forms rather than repackaging oxide under multiple product names. That matters if you are making an informed choice between Citrate and Bisglycinate.
Where Solgar does not earn its premium:
- Certifications. Unlike Thorne's NSF Certified for Sport status, Solgar does not carry the same level of third-party certification. For athletes or anyone subject to drug testing, this is a relevant gap.
- Elemental dose. 120mg per capsule for the Bisglycinate is solid, but some competing brands now offer 300-400mg elemental glycinate per capsule at a lower cost-per-mg. If your goal is maximising elemental dose per pound spent, Solgar is not the best value option at the bisglycinate tier.
The balance: Solgar is not a premium supplement. It is a reliable mid-market option that performs better than budget brands without commanding a premium that requires clinical-grade justification. For buyers who want a trusted name at a reasonable price and are not tracking elemental cost-per-mg obsessively, it is a sound choice. For buyers who want the best value per elemental milligram in a glycinate, there are now better-value UK alternatives.
Who Should Buy Solgar Magnesium (and Who Should Skip It)
Buy if:
- You want a well-established, widely available magnesium supplement from a brand with a 75-year track record
- You prefer buying from H&B or a major UK retailer (Boots, Amazon UK) rather than direct-to-consumer supplement brands
- You want citrate form for general use and are comfortable with a moderate premium over own-brand
- You are looking for bisglycinate specifically and want a brand your GP or pharmacist will recognise
Skip if:
- You want the best cost-per-elemental-mg at the glycinate tier - dedicated UK glycinate brands now undercut Solgar on this metric
- You need NSF Certified for Sport or Informed Sport certification (Thorne and others offer this; Solgar does not)
- You are looking at Solgar's Chelated Magnesium blend specifically - the oxide content makes this the weakest form in the range
- Large tablets are a problem for you - the Citrate tablets are notably large, and several verified reviewers flag this
One note worth adding for anyone taking magnesium primarily because sleep feels off: if your evening caffeine intake is high, the issue may be your coffee habits as much as your micronutrient status. If you are grinding and brewing at home, the best coffee beans UK guide covers lower-caffeine roast options worth switching to in the afternoons.
For a broader view of where Solgar sits among the best-tested options, the best magnesium supplement UK guide covers the full competitive field. If you are specifically comparing glycinate options, the best magnesium glycinate UK roundup ranks Solgar against the most relevant alternatives.
Frequently Asked Questions
Is Solgar magnesium worth it?
For most general-use buyers, yes. Solgar Magnesium Citrate and Bisglycinate are legitimate, well-absorbed forms at a consistent quality level. The price runs around 1.5 to two times own-brand citrate, but the formulation is more reliable than budget oxide-based tablets. If cost-per-elemental-mg is your primary metric, dedicated glycinate brands now offer better value at the bisglycinate tier.
Is Solgar magnesium a good brand?
Solgar is a well-regarded mid-market supplement brand with over 75 years of manufacturing history. It sits above budget supermarket own-label ranges but below clinical brands such as Thorne. The forms in its magnesium line (Citrate and Bisglycinate) are correct and well-dosed. For a high-street brand available in H&B and Boots, that is a better result than most competitors at the same price point.
Why is Solgar expensive?
Solgar carries a brand premium built on 75-plus years of manufacturing history, consistent formulation, and editorial recognition. It also avoids magnesium oxide, which makes budget tablets appear cost-effective but delivers poorly in practice. The premium reflects quality consistency rather than a unique formulation - at the citrate level, comparable own-brand products can be very close in quality for less money.
Is Solgar better than Holland and Barrett own-brand magnesium?
Where H&B uses citrate form, the bioavailability tier is the same as Solgar and the quality gap is narrow. Solgar's manufacturing consistency gives it a slight edge, but the cost difference of roughly £4-£6 per 60 tablets is hard to justify on formulation grounds alone. Where Solgar clearly wins is against H&B products using magnesium oxide, a form with poor absorption that appears in some budget H&B lines.
Which Solgar magnesium is best - citrate, bisglycinate, or chelated?
For sleep and nervous system support, Bisglycinate is the strongest choice. For general supplementation and bowel regularity, Citrate is the standard recommendation and the most studied form. Avoid the Chelated blend: it contains magnesium oxide, which has poor bioavailability and pulls down the overall absorption profile of the product. The magnesium citrate vs glycinate comparison covers the form differences in full if you want the evidence behind this recommendation.
Are Solgar magnesium tablets hard to swallow?
The Citrate tablets are large relative to standard capsules. Verified reviewers across H&B (734 reviews) and iHerb (12,521 reviews) consistently flag them as 'on the large side' and 'slightly bitter and chalky.' The bitterness is a property of magnesium citrate, not a defect. If tablet size is a concern, Solgar Bisglycinate comes in capsule form and is the more practical alternative.
Is Solgar third-party tested and where is it manufactured?
Solgar is manufactured in the United States and supplied to UK retailers via its EU distribution network. Products are made to Good Manufacturing Practice (GMP) standards with internal quality testing. Solgar does not carry NSF Certified for Sport or Informed Sport certification. For athletes subject to anti-doping requirements, Thorne Magnesium Bisglycinate is the directly comparable alternative with NSF certification.
Which Solgar magnesium is best for sleep vs regularity?
For sleep, choose Bisglycinate. Glycinate is calming to the nervous system, the most consistently linked form to sleep quality improvement, and gentler on the digestive system. For regularity, choose Citrate. Magnesium citrate has a mild osmotic laxative effect that increases water in the gut. For a full breakdown by timing and use case, the best magnesium for sleep guide covers the evidence.
A registered Nutritional Therapist and member of BANT, Clemmie blends science with a holistic approach to wellbeing.
