Ghost FitnessGhost Fitness/Magnesium/Is it better to take magnesium before or after a workout?
Is it better to take magnesium before or after a workout?
Neither: magnesium has no acute effect, so before versus after a workout is a false choice. Take it daily with the evening meal, whichever side of training that lands. The trials behind every benefit dosed daily for weeks.
- Neitherthe verdict: the session clock is the wrong clock
- 0acute effects to place on either side of training
- Dailythe schedule the athlete trials actually used
- 22pa day at dinner, wherever training falls
The daily serving: Futuro Labs Magnesium Glycinate on Amazon UK, 300mg elemental per 2 capsules, £19.99 for 180. Label breakdown. The pre-workout half is examined in full on glycinate before working out; the recovery dose on glycinate for muscle repair.
Why the question is a false choice
Before-or-after framing assumes magnesium does something in the hours around a session, and it does not: no acute strength, endurance, pump or focus effect exists to place before training, and no acute repair, relaxation or soreness effect exists to place after it. The athlete evidence is unanimous on schedule: Setaro's performance trial and Reno's soreness study dosed daily for weeks and measured outcomes against that calendar, never against session proximity, because the mechanism, enzymatic adequacy restored where intake ran low, is a stock level, not a signal. Asking whether magnesium goes better before or after a workout is like asking whether to refuel the car before or after checking the tyres; the tank does not care.
The two half-truths that keep the question alive
Two adjacent facts get misread into session timing. Sweat losses: hard training does cost magnesium through sweat and urine, per Nielsen and Lukaski's review, which sounds like a post-workout replacement cue but is actually a daily-total argument, since losses are covered by the day's intake wherever it lands, and no evidence rewards racing the replacement to the locker room. Post-workout meals: many lifters eat their main meal after evening sessions, and that meal is a fine home for the capsules, but it is fine because it is dinner, the comfortable, consistent slot, not because it is post-workout; the same meal at midday on a rest day serves identically. The one session-adjacent rule is negative: a full dose on an empty stomach right before training sits heavier than anyone wants under a bar, one more reason the answer keeps landing on dinner.
| Slot | What the hope is | What actually happens | Verdict |
|---|---|---|---|
| 30 to 60 minutes pre-workout | Performance, cramp prevention | Nothing acute; possible gut heaviness | Skip |
| Immediately post-workout | Faster recovery, loss replacement | Nothing time-sensitive; losses are a daily total | Unnecessary |
| Post-workout meal, if it is dinner | Convenience | Works, because it is dinner | Fine: same as any evening meal |
| Evening meal, daily, rest days included | The trial schedule | Adequacy maintained; every studied benefit lives here | The answer |
| What belongs on the session clock instead | n/a | Carbs 1 to 3 hours pre, fluids, caffeine if used | The real pre-workout list |
The verdict, and the routine that ignores the gym clock
Is it better to take magnesium before or after a workout: neither, because the session clock is the wrong clock, and the freedom in that answer is worth taking, no shaker ritual, no locker-room capsules, no rest-day confusion. The routine: Futuro Labs Magnesium Glycinate, 2 capsules with the evening meal, every day of the block, training days and rest days identically, 300mg elemental at 80% NRV from bisglycinate at 20%, vegan, UK made under GMP and BRC, panels shown, £19.99 for 180 capsules, 22p a day, judged over a month on tiredness, cramps, twitching and sleep. Give the pre-session hour to the things that actually use it, a carbohydrate meal, fluids and caffeine if you take it, and let the mineral keep the only appointment it ever had, dinner.
What to check on the label
- Neither: no acute effect exists on either side of a session.
- The trials dosed daily for weeks: the calendar, not the session clock.
- Sweat losses are a daily-total argument, not a locker-room deadline.
- The post-workout meal works when it is dinner: for dinner's reasons.
- Rest days dose identically: adequacy is a stock level.
The worked example: Futuro Labs Magnesium Glycinate
Futuro Labs Magnesium Glycinate ignores the gym clock by design: 300mg elemental per 2 capsules (80% NRV) from bisglycinate 20%, with the evening meal daily, training or not, 22p a day from a £19.99 bottle of 180. Vegan, UK made, panels shown.
- 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
Should I take magnesium right after training to replace sweat losses?
No deadline exists: losses are covered by the day's total intake wherever it lands. The evening serving replaces them on schedule.
Does magnesium before a workout prevent cramps during it?
No: mid-session cramps are fatigue and conditioning stories, and any intake contribution was set by the past weeks of dosing, not the past hour.
Is it okay to take magnesium with my post-workout meal?
Yes, when that meal is your evening meal: it is the right slot for dinner's reasons, comfort and consistency, not for post-workout ones.
Do rest days need magnesium too?
Yes: every trial that found a benefit dosed daily, and losses continue between sessions. Adequacy is a stock level, not a training response.
What should actually go in the pre-workout hour?
A carbohydrate meal one to three hours out, fluids through the day, and caffeine if you use it: the inputs with real acute effects.
Sources
- Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
- Setaro L, et al. Magnesium status and the physical performance of volleyball players: effects of magnesium supplementation. Journal of Sports Sciences 2014;32(5):438-445. PubMed record
- Reno AM, Green M, Killen LG, O'Neal EK, Pritchett K, Hanson Z. Effects of magnesium supplementation on muscle soreness and performance. Journal of Strength and Conditioning Research 2022;36(8):2198-2203. PubMed record
- Nielsen FH, Lukaski HC. Update on the relationship between magnesium and exercise. Magnesium Research 2006;19(3):180-189. PubMed record
- Expert Group on Vitamins and Minerals. Safe Upper Levels for Vitamins and Minerals. Food Standards Agency, 2003 (magnesium guidance level 400mg a day from supplements). https://cot.food.gov.uk/sites/default/files/vitmin2003.pdf
- EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on the substantiation of health claims related to magnesium. EFSA Journal 2010;8(10):1807. https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2010.1807