We earn commission on purchases made through our links. It never affects ranking: tables are ordered purely by price per dose, and no retailer or brand can pay for position.We earn commission when you buy through our links. It never affects the ranking. Full disclosure.

perdose
Updated

Home › Minerals › Magnesium

Promix NutritionMinerals

Relax: Magnesium Complex, 90 capsules

£52.99 for 90 capsules at Healf. That works out at £1.47 per 100 mg magnesium, which ranks it 62nd of the 66 magnesium bisglycinate products we price across 13 UK retailers.

What it really costs, per 100 mg magnesium£1.47One 100 mg dose is our comparison unit for magnesium. It is not a recommendation.
A day£1.47
A week£10.30
A month£44.16
A year£537.26

At one 100 mg dose a day, this pack lasts 36 days. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

Magnesium

  • Servings: 90 ÷ 3 per serving = 30
  • In the pack: 30 × 120 mg = 3.6 g
  • £52.99 ÷ 3.6 g × 100 mg = £1.47 per 100 mg magnesium
  • A week £1.47 × 7 = £10.30 · a month × 30 = £44.16 · a year × 365 = £537.26
  • Amount per serving: stated on the label.

Lemon balm

  • Servings: 90 ÷ 3 per serving = 30
  • In the pack: 30 × 300 mg = 9 g
  • £52.99 ÷ 9 g × 500 mg = £2.94 per 500 mg
  • A week £2.94 × 7 = £20.61 · a month × 30 = £88.32 · a year × 365 = £1074.52
  • Amount per serving: extract weight stated on the label.

The standard dose is a comparison unit, not a recommendation. Always confirm the price on the retailer's site. How we compare everything.

Cheaper magnesium bisglycinate

All 66, ranked →
Designs for HealthMagnesium Glycinate PowderHealf · 300 mg a serving · £13.00 a month · a pack lasts 3 months43p£38.99View at Healf (opens in a new tab)
Healthy MetalMagnesium Glycinate Drink MixHealf · 250 mg a serving · £15.98 a month · a pack lasts 2 months53p£39.95View at Healf (opens in a new tab)
Magnesium BisglycinateHealf · 200 mg a serving · £18.75 a month · a pack lasts 2 months62p£37.49View at Healf (opens in a new tab)
Liposomal Magnesium Bisglycinate 2,000mgHealf · 200 mg a serving · £23.99 a month · a pack lasts 2 months80p£47.99View at Healf (opens in a new tab)
Liposomal Magnesium BisglycinateHealf · 100 mg a serving · £27.99 a month · a pack lasts 30 days93p£27.99View at Healf (opens in a new tab)
This productHealf · 120 mg a serving · £44.16 a month · a pack lasts 36 days£1.47shown above

Switching to the Healf pack saves £31.16 a month at the same 100 mg dose.

Ranked purely by price per 100 mg magnesium. 86 combination products also contain magnesium.

How it compares: lemon balm

Compare every product in this form →
VimergyLemon BalmCheapest per 500 mgHealf · 175 mg a serving · £31.68 a month · a pack lasts 40 days£1.06£42.50View at Healf (opens in a new tab)
VimergyLemon BalmHealf · 175 mg a serving · £31.96 a month · a pack lasts 3 months£1.07£89.49View at Healf (opens in a new tab)
VimergyLemon BalmHealf · 175 mg a serving · £52.86 a month · a pack lasts 11 days£1.76£18.50View at Healf (opens in a new tab)
This productHealf · 300 mg a serving · £88.32 a month · a pack lasts 18 days£2.94shown above

Ranked purely by price per 500 mg. 24 combination products also contain lemon balm.

On the label

Magnesium · Bisglycinate (glycinate)
120 mg per serving (stated on the label)
Lemon balm · Lemon balm
300 mg per serving (extract weight stated on the label)
Pack
90 capsules · 30 servings · 3 capsule(s) a serving
Cost per serving
£1.77 (30 servings in the pack)
More label details
Sold by
Healf
What the listing says
“90caps” · “Servings Per Container: 30” · “Serving Size: 3 Capsules” · “Organic Lemon Balm Extract 10:1 (Melissa officinalis, leaf) ; 300 mg”
Ingredients

Organic Lemon Balm Extract 10:1 (Melissa officinalis, leaf), Magnesium (as Magnesium Bisglycinate Chelate), Bovine Gelatin (Capsule), Non-GMO Hypoallergenic Plant Fiber

From the Healf listing. Check the pack itself if you have an allergy: labels mark allergens in bold.

Is something wrong? Tell us

Add to your basket

View basket

Your basket prices everything you take together: whole packs, delivery included, from as few websites as you like.

One 100 mg dose is our comparison unit, not a recommendation.

Price history

No price change since 1 October 2026. Checked on 20 days, most recently 20 October 2026.

Price at every check
£52.99Healf
First recorded
£52.991 Oct
Checked on
20 dayssince 1 Oct
Pack price at each check.
  1. First checked at Healf: £52.99

Questions about this product

How much does Promix Nutrition Relax: Magnesium Complex cost per 500 mg?

£2.94 per 500 mg, from £52.99 for 90 capsules at Healf, checked on 20 October 2026.

How long does one pack last?

18 days at one 500 mg dose. The pack holds 9 g in total.

How much does Promix Nutrition Relax: Magnesium Complex cost per 100 mg magnesium?

£1.47 per 100 mg magnesium, from £52.99 for 90 capsules at Healf, checked on 20 October 2026.

Is it the cheapest magnesium bisglycinate in the UK?

No, it is 62nd of 66. Magnesium Bisglycinate 1500mg at Simply Supplements works out at 1p per 100 mg magnesium.

How long does one pack last?

36 days at one 100 mg dose. The pack holds 3.6 g in total.

About Promix Nutrition

All 24 Promix Nutrition products, priced per dose

More from Promix Nutrition

Keep comparing

All magnesiumEvery form, cheapest per 100 mg magnesium firstMagnesium Bisglycinate (glycinate)66 products ranked, from 1pMagnesium guideWhat it is, why people take it, how the forms differPromix NutritionAll 24 products from this brand, per doseMineralsEverything else we price in this categoryMagnesium price historyEvery magnesium product's price per dose and price historyBuild a basketThe cheapest way to buy several at onceHow we compareWhere every number on this page comes from