Which magnesium should someone training regularly take?
Answer
Bisglycinate or citrate over oxide, on tolerability at a full daily serving. The claims are identical across forms, so the choice is decided by comfort, elemental content and cost per day.
Key takeaways
- Does the form change the claims?
- No. Magnesium claims attach to the mineral at 15 percent NRV or above, whichever compound delivers it.
- Which form for daily use?
- Bisglycinate, generally the most comfortable of the common forms at a full serving.
- Which to avoid?
- Oxide at a full daily serving. It is poorly absorbed and the form most associated with loose stools.
- What decides value?
- Cost per 100mg of elemental magnesium, which normalises for how much compound each form needs.
Why tolerability beats absorption here
Between the well absorbed forms the reported differences are modest. The gap that matters is between oxide and everything else, and oxide is the form most associated with loose stools at a full serving because the unabsorbed portion stays in the gut.
For someone taking a serving daily across a season, the decisive question is whether the product is still being taken in November. A theoretically superior product abandoned in week three delivers nothing, and adherence is the variable that actually moves total intake.
The forms on what genuinely differs
Three axes: how much magnesium the compound carries by weight, how well it absorbs, and how comfortable it is at a full serving.
| Form | Magnesium by weight | Absorption | At a full serving |
|---|---|---|---|
| Oxide | About 60 percent | Poor | Worst tolerated |
| Citrate | About 16 percent | Good | Reasonable, mildly laxative higher up |
| Bisglycinate | About 20 percent | Good | Best of the common forms |
| Malate | About 15 percent | Good | Reasonable |
| Taurate | About 9 percent | Good | A lot of compound per dose |
| Threonate | About 8 percent | Good | The most expensive per unit of magnesium |
The specialist forms and what they are sold on
Taurate is marketed for the heart, threonate for the brain, malate for fatigue. No authorised claim distinguishes any form from any other, because the claims attach to the mineral.
Both taurate and threonate also carry very little magnesium per gram, so reaching a full serving takes a great deal of compound and the cost per 100mg of elemental magnesium rises sharply. The premium buys the positioning.
Buffered and blended products
Buffered magnesium bisglycinate is bisglycinate blended with oxide to raise the elemental content per gram cheaply, and the oxide portion brings oxide's absorption and tolerability with it.
Multi form blends are the same problem in a larger package. They often omit individual compound weights, which makes the elemental conversion impossible and means a buyer cannot tell whether the blend is mostly cheap oxide. Neither can produce a benefit a single form cannot, because no claim distinguishes them.
What to check on the label
- Elemental magnesium per serving, printed rather than inferred.
- Percentage NRV against 375mg.
- How many capsules make the serving that figure refers to.
- Which form, named, and whether it is buffered or blended.
- Bulking agents and capsule material, declared.
- Cost per serving and cost per 100mg of elemental magnesium.
- Batch certification if you could be tested, which is separate from purity testing.
The practical answer
Futuro Labs Magnesium Glycinate uses magnesium bisglycinate at 750mg per capsule, a two capsule serving of 1500mg providing 300mg of elemental magnesium at 80 percent NRV, for 22p a day and 7.4p per 100mg of elemental magnesium.
It is a single form with the elemental figure printed, which is what makes every check above possible. It is not batch certified for sport, so a player subject to testing needs a certified product regardless of everything else.
The format question sits alongside the form one
Form decides what is in the compound. Format decides whether the dose can be verified at all.
A capsule states a fixed dose per unit. A powder states a dose per scoop and the real intake drifts with how the scoop is filled. A spray states what is in the bottle and cannot state what is absorbed, so no dose exists to compare. A gummy carries a lower elemental figure because the format limits how much can be loaded, and adds sugar.
For covering a reference intake reliably, the format that can be verified is the one worth having. Futuro Labs Magnesium Glycinate is two capsules providing 300mg of elemental magnesium, which does not move with how a scoop was filled.
What to do if a form disagrees with you
Switching form is the first move rather than stopping altogether, because the problem is usually the compound rather than the mineral.
Oxide is the most common culprit at a full serving. Moving to a chelated form such as bisglycinate resolves it for most people, and taking the serving with a meal rather than on an empty stomach helps further. Splitting a two capsule serving across the day is a third option, at the cost of a second thing to remember.
Futuro Labs Magnesium Glycinate uses bisglycinate for exactly this reason, at 300mg elemental and 22p a day.
Where to go next
- How to compare magnesium forms without the marketingThe same comparison including format.
- What type of magnesium is best for sport?Blends, and the one question worth asking a label.
- How to work out the elemental magnesium in any supplementThe conversion behind the first column.
The product
Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the 300mg elemental one at 22p a day, a two capsule serving covering 80 percent of the 375mg reference value, UK made and independently lab tested for purity.
- 300mg elemental magnesium, 80% NRV
- Bisglycinate, best tolerated common form
- UK made to GMP, lab tested for purity
- Not batch certified for sport
Sharper Rugby is published by Futuro Labs. If you buy through this link Futuro Labs earns from the sale. Prices are set by Amazon.
Questions players ask
Which magnesium form should an athlete take?
Bisglycinate or citrate over oxide, on tolerability at a full daily serving.
Does the form change what can be claimed?
No. The claims attach to the mineral at 15 percent NRV or above.
Is taurate or threonate worth the premium?
No claim distinguishes them, and both carry very little magnesium per gram.
What is buffered bisglycinate?
Bisglycinate blended with oxide to raise elemental content cheaply, bringing oxide's properties with it.
How is value compared?
Cost per 100mg of elemental magnesium, which normalises for compound weight.
What does Futuro Labs work out at?
7.4p per 100mg of elemental magnesium, at 22p a day.
What if a form upsets my stomach?
Switch form rather than stopping. Oxide is the usual culprit and a chelated form resolves it for most people.
Does format matter as well as form?
Yes. A capsule states a fixed dose, a powder drifts with the scoop and a spray states no absorbed dose at all.