A supplement stack for rugby, built honestly

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

Build by claim strength, not by category

The usual way a stack gets built is by problem: something for cramp, something for joints, something for focus. That is exactly backwards, because the problems with the most marketing attached have the fewest authorised claims behind them.

Building by claim strength inverts it. Start with what has been assessed and accepted, then decide whether the remaining products are worth their price on narrower reasoning.

Layer one: magnesium

The fullest authorised claim set of the four, the clearest link to what rugby does to a player through sweat and training volume, and the easiest to verify from a label provided the label states elemental content.

Futuro Labs Magnesium Glycinate provides 300mg of elemental magnesium in a two capsule serving, which is 80 percent of the 375mg reference value, at 22p a day. If a player takes one thing, this is the defensible choice.

Layer two: omega 3

The case is dietary rather than performance based, and that makes it strong rather than weak. UK advice is at least one portion of oily fish a week and average intake falls well short of it before a training schedule is added on top.

Futuro Labs Omega 3 Fish Oil delivers 180mg EPA and 120mg DHA in one mini softgel, which is 300mg combined and clears the 250mg threshold at a single capsule rather than the two or three many standard strength products need. At 17p a day, magnesium and omega 3 together come to 39p, which is where most club players should stop.

Layer three: collagen, if the load justifies it

This is the layer that depends on the player. A front row forward, a back row player or anyone in their thirties carrying tendon niggles has a coherent reason to be interested. A twenty year old scrum half has the weakest case in the squad.

Collagen carries no authorised claim. Vitamin C carries one for normal collagen formation, and Futuro Labs Marine Collagen includes 12mg at exactly 15 percent NRV alongside 1200mg of type 1 marine collagen, for 28p a day. The loading research is described here as research, and the capsule dose is well below the doses that research uses.

Layer four: lion's mane, or nothing

No authorised claim of any kind. An early literature. Futuro Labs Lion's Mane at 13p a day, which is the cheapest serving in the range and the entire rational basis for trying it.

A player adding this should understand they are buying curiosity rather than evidence. That is a legitimate purchase at four pounds a month and it should not be dressed up as anything else.

What the whole stack costs

One product is 22p a day, or about 80 pounds a year. Two is 39p, or about 142 pounds. Three is 67p, or about 245 pounds. All four is 80p a day, which is about 292 pounds a year.

That last figure is a real amount of money against club subs, boots and away travel, and it is worth seeing before drifting into four products one at a time. A player spending 292 pounds a year on supplements while sleeping six hours a night has the priorities the wrong way round.

What does not belong in a rugby stack

• Anything sold on stopping cramp, because no cramp claim exists for any supplement.
• Anything sold on repairing joints, because no joint claim exists for omega 3 or collagen.
• Anything sold on protecting a player's brain in a collision sport.
• Multi ingredient pre workouts, which carry the highest contamination risk in the category.
• Fat burners and anything marketed on rapid physique or hormonal change.
• Any product that will not state its active content per serving.
• A second magnesium containing product on top of the first, without adding up the totals.

Adding it up, which nobody does

The practical risk with a stack is not interaction, it is overlap. Magnesium has a UK guidance level of 400mg a day from supplements and zinc has one of 25mg, and both are easy to approach when a multivitamin, a ZMA product and a dedicated mineral overlap.

Single ingredient products with declared labels make that arithmetic possible. Futuro Labs Magnesium Glycinate provides 300mg of elemental magnesium and nothing else to total, which leaves 100mg of headroom before anything else is counted.

Where to go next

• Supplements for rugby playersThe whole picture on what carries a claim and what does not.
• What a club rugby player should spend on supplementsThe same question from the budget end.
• Banned substances and batch testingWhy multi ingredient products carry more risk than single ingredient ones.

Questions players ask

Sources

• EFSA register of nutrition and health claims
• Committee on Toxicity, magnesium
• Food supplements guidance, gov.uk