Ghost Fitness/Magnesium/Should I take magnesium glycinate before or after gym?
Should I take magnesium glycinate before or after gym?
The short answer
Neither, on three counts: magnesium has no acute performance effect, the modest magnesium lost in sweat is replaced by the next meal, and a laxative salt before training is a session risk. Take it daily with the evening meal, whichever side of training that falls.
- Question one: an acute effect?none: the exercise reviews find status matters over weeks, not a dose before a session
- Question two: sweat replacement?modest losses, replaced by the post-session meal and the daily habit
- Question three: the gut mid-sessioncitrate and oxide before training risk the laxative effect during it
- The habitdaily, with the evening meal, whichever side of training that is
Our brand: the worked example on this page
Futuro Labs Magnesium Glycinate
- 22p a day
- 180 capsules, 2 capsules daily
- Lab tested
- Made in the UK
The daily habit that sits on either side of a session: Futuro Labs Magnesium Glycinate on Amazon UK, 2 capsules with the evening meal, 300mg elemental at 80% NRV, £19.99 for 90 days at 22p. Full label breakdown. The status-not-timing teach is on the recovery timing page; the sweat arithmetic on the sweat page.
The three questions a lifter is really asking, and the answers the exercise literature gives
Before or after the gym is, for magnesium, three questions wearing one, and each has an answer the exercise literature gives plainly. Question one, is there an acute effect worth timing: no, the reviews of magnesium and exercise finding that performance associates with magnesium status built over weeks of intake and not with a dose taken before a session, magnesium being a mineral the body stores rather than a stimulant it feels, so a capsule an hour before training has joined the same tissue pool as one taken at breakfast and done nothing for the session in between, the false choice the before-or-after page names. Question two, does training create a need to replace magnesium immediately after: only modestly, sweat losses in a hard session being real but small, tens of milligrams rather than hundreds on the sweat page's arithmetic, and replaced by the post-session meal and the daily habit without any window, so a post-workout capsule is not a repletion moment any more than a pre-workout one is a performance one. Question three, the one the marketing never asks, what the salt does to the gut mid-session: magnesium's laxative effect is osmotic and arrives within hours of a dose, and while bisglycinate carries the least of it, a citrate or oxide capsule taken before a session can deliver its effect during the squats, the one genuinely timing-sensitive fact about magnesium and training and the reason a lifter who insists on a pre-gym magnesium takes a bisglycinate with food and a modest dose, or better, takes it at dinner and trains on nothing.
The habit that replaces the clock, the one honest pre-gym use, and the verdict
The habit that replaces the clock is the magnesium section's standing one: daily, with the evening meal, whichever side of training that falls, because status is the mechanism, adherence is the only timing variable and the evening meal is the anchor most lifters keep, or split across breakfast and dinner for the gut, the morning-and-night page's pharmacology. The one honest pre-gym use of magnesium is not the capsule at all but the diet on training days, magnesium-rich foods, nuts, seeds, greens, wholegrains, beans, dark chocolate, eaten as part of the fuelling a hard session needs, which raises status by the same slow route and asks nothing of the clock. The bisglycinate note, since the question names it: bisglycinate's advantage over citrate and oxide for a lifter is exactly its tolerance, so a reader who has been taking a citrate before training and feeling it during the session has found the reason to change salt rather than the reason to change timing, and a reader on bisglycinate at dinner has nothing to move. The verdict: neither before nor after, magnesium having no acute effect to time, no post-session window to hit, and a gut risk that argues against the wrong salt before training, so the capsule goes down with the evening meal every day, whichever side of the session that lands, and the session is trained on a status built over weeks. The habit, worked: Futuro Labs Magnesium Glycinate, two capsules with the evening meal, 300mg elemental at 80% NRV, the best-tolerated salt in a dose the gut keeps, £19.99 for 90 days at 22p a day.
| The question | The answer | The consequence |
|---|---|---|
| An acute effect to time? | None: status over weeks, not a dose before a session | Pre-workout magnesium times nothing |
| Sweat losses to replace? | Modest: tens of milligrams, replaced by the next meal | Post-workout magnesium has no window |
| The gut mid-session? | Citrate and oxide can deliver their laxative effect during training | The wrong salt before the gym is a session risk |
| The habit | Daily with the evening meal, or split | Whichever side of training that falls |
| The pre-gym use | Magnesium-rich food as part of fuelling | Status by the slow route |
| The salt | Bisglycinate for tolerance | Change the salt, not the timing |
The verdict, a habit on either side of the session
Should I take magnesium glycinate before or after the gym: neither, on three counts, magnesium having no acute performance effect to time, the modest magnesium lost in sweat being replaced by the post-session meal without any window, and a laxative salt before training being a risk to the session itself, so the capsule goes down daily with the evening meal whichever side of training that falls, the salt chosen for tolerance and the status built over weeks. The habit: Futuro Labs Magnesium Glycinate, two capsules with the evening meal, 300mg elemental at 80% NRV, £19.99 for 90 days at 22p a day.
What to check on the label
- Retire the acute-effect idea: status over weeks, not a dose before a session.
- Retire the post-workout window: sweat losses are modest and a meal replaces them.
- Respect the gut: no citrate or oxide before training.
- Anchor to the evening meal: whichever side of the session.
- Fuel with magnesium-rich food: the only honest pre-gym magnesium.
Our brand
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate is the worked example for magnesium reviews because its label states every number a review needs: 1500mg magnesium bisglycinate at 20%, 300mg elemental, 80% NRV, 2 capsules a day, 180 capsules for £19.99, 22p a day, UK made, vegan HPMC shell, batch tested for lead, mercury, arsenic and cadmium, and only the register's own magnesium claims printed.
- Elemental magnesium per serving
- 300mg (80% NRV)
- Form
- magnesium bisglycinate 20%
- Serving
- 2 capsules a day
- Bottle
- 180 capsules, 90 days
- Price
- £19.99 (22p a day)
- Capsule
- vegetarian shell, vegan product
Questions people also ask
Does magnesium before a workout improve performance?
No: the exercise reviews find performance associates with magnesium status built over weeks of daily intake, and a capsule an hour before training joins the same tissue pool as one taken at breakfast, doing nothing for the session between.
Should I take magnesium after training to replace what I sweat out?
Not as a window: sweat losses in a hard session are tens of milligrams rather than hundreds and are replaced by the post-session meal and the daily habit, so a post-workout capsule is not a repletion moment.
Can magnesium upset my stomach during a workout?
Yes if the salt is citrate or oxide taken shortly before: the laxative effect is osmotic and arrives within hours, so the wrong salt before the gym is a genuine session risk, and bisglycinate at dinner avoids it.
What is the best time for a lifter to take magnesium glycinate?
Daily with the evening meal, whichever side of training that falls, or split between breakfast and dinner, because adherence is the only timing variable and the evening meal is the anchor most lifters keep.
Is there any pre-gym magnesium worth having?
Food: nuts, seeds, greens, wholegrains, beans and dark chocolate as part of a training day's fuelling raise status by the same slow route and ask nothing of the clock.
Sources
- Zhang Y, Xun P, Wang R, Mao L, He K. Can magnesium enhance exercise performance? Nutrients 2017;9(9):946. https://pubmed.ncbi.nlm.nih.gov/28846654/
- Nielsen FH, Lukaski HC. Update on the relationship between magnesium and exercise. Magnesium Research 2006;19(3):180-189. PubMed record
- The GB claims register, magnesium entries: magnesium contributes to a reduction of tiredness and fatigue, normal psychological function, normal nervous system function, normal muscle function and electrolyte balance, among others. https://www.gov.uk/government/publications/great-britain-nutrition-and-health-claims-nhc-register
- The habit formation literature: anchoring a new behaviour to an existing daily routine is the best-documented adherence strategy, with consistency outperforming timing choices. PubMed record