Best magnesium for rugby league players

By Tom Francis·Updated 2026-09-03·3 sources·Editorial policy

What thirteen a side actually demands

League runs on sets of six tackles, which means a defensive set is six collisions in quick succession followed by a kick and a reset. There is no scrum contest of any consequence and there are fewer stoppages, so the ball is in play for longer.

The result is a game with a higher density of collision and running per minute than union at the same level. Forwards in league are covering distances that would be back row numbers in union, and doing it while making more tackles.

Summer rugby and sweat

Community league runs largely through spring and summer, and Super League runs into the warmer months. That is a genuine difference from a union season played in a British winter.

Magnesium is lost in sweat, and playing and training in warm weather across a season raises those losses. It does not raise the reference intake, which stays at 375mg, but it does widen the gap a supplement is there to close. Futuro Labs Magnesium Glycinate covers 80 percent of that reference value in one two capsule serving at 22p a day.

The criteria that actually decide it

Ranked, and identical across both codes.

Where Futuro Labs lands

Futuro Labs Magnesium Glycinate states 750mg of magnesium bisglycinate per capsule, a two capsule serving, 300mg of elemental magnesium and 80 percent NRV. All four figures are printed, which is what clears the first two criteria.

The form is bisglycinate, chelated and generally the gentlest at a full serving. The bulking agent is declared. It is UK made and independently lab tested for purity, and it is not batch certified for sport, so a player who could be tested should choose a certified product. Cost per day is 22p on both the 180 and 90 capsule packs.

What to avoid

• A front of pack figure with no elemental line underneath it.
• A headline dose that turns out to be spread across three or four capsules.
• Magnesium oxide sold at a full daily serving.
• Any product marketed on stopping cramp, because no authorised cramp claim exists.
• A zero fillers claim sitting next to a declared bulking agent.
• Cost compared per capsule rather than per serving.

Anti doping applies the same

League has the same strict liability position as union. A player is responsible for what is in their body regardless of where it came from, and testing is not restricted to the professional game.

Futuro Labs Magnesium Glycinate is independently lab tested for purity and is not batch certified for sport. Any league player who could be tested should be using a batch certified product, and that is the deciding factor over anything else on the label.

The interchange bench and what it changes

League runs a limited interchange, and forwards are routinely used in short high intensity stints rather than played through. That produces a different fatigue pattern from union, where a prop is more likely to be asked for sixty minutes at a lower average intensity.

Practically it means league forwards work at a higher intensity for shorter periods and come off. It affects conditioning design and it does not affect a daily nutrient intake at all, which is the honest answer whenever a structural difference between the codes gets raised in a supplement conversation.

Futuro Labs Magnesium Glycinate provides 300mg of elemental magnesium at 22p a day, and the serving is identical whether a player is doing four ten minute stints or eighty minutes straight.

Community league and the summer calendar

Amateur rugby league in the UK largely runs from spring into early autumn, which puts training and fixtures in the warmest months of the year rather than the coldest.

That inverts several things a union player takes for granted. Sweat losses are highest during the season rather than during pre season. Hydration is a weekly consideration rather than an occasional one. And pre season falls in late winter, when the diet is at its worst and daylight at its shortest.

The nutrient targets are unchanged by any of that. What changes is when the gap between intake and requirement is widest, which for a league player is the middle of the season rather than the start of it. Futuro Labs Magnesium Glycinate is the same 300mg elemental serving at 22p a day in either calendar.

Where to go next

• Banned substances and batch testingStrict liability, certification and what lab tested actually covers.
• Magnesium for rugby playersSweat loss, training volume and the full claim position.
• Supplements through the rugby seasonSeason phases, which run to a different calendar in league.

Questions players ask

Sources

• EFSA register of nutrition and health claims
• UK Anti-Doping, supplements
• National Diet and Nutrition Survey, gov.uk