Product Description
Here's something endurance athletes don't talk about enough: GI function and magnesium are deeply connected. Magnesium citrate is one of the most bioavailable forms of the mineral available, and it serves double duty — supporting the muscle function, heart health, and urinary mineral balance your training demands, while also promoting the bowel regularity that's a genuine performance concern for athletes who train hard and race harder.
If you've dealt with pre-race GI issues, sluggish digestion during heavy training, or the persistent muscle cramps that show up when magnesium runs low, this is the formula worth knowing.
Thorne Magnesium Citrate delivers 250mg of highly bioavailable magnesium in a clean, citrus berry flavored powder that dissolves quickly in water — making it one of the easiest daily magnesium habits to actually stick to.
250mg Magnesium Citrate Per Serving – Magnesium citrate is consistently ranked among the most well-absorbed forms of magnesium available. At 250mg per serving, this formula delivers a meaningful dose that supports the 600+ enzymatic reactions your body runs on, with enough potency to address the magnesium depletion that accumulates through heavy sweat loss and high training volume.
GI Support Designed Into the Formula – Magnesium citrate's mild osmotic effect supports bowel regularity by drawing water into the intestine and promoting healthy gut motility. For endurance athletes dealing with irregular digestion during training blocks or pre-race GI anxiety, this dual-function aspect of magnesium citrate is a practical benefit — not a side effect to manage, but a feature to lean into.
Urinary Tract and Kidney Health – Both magnesium and citrate independently support healthy urinary mineral balance, reducing the buildup of calcium oxalate crystals that can stress the kidneys over time. High-volume athletes who are chronically slightly dehydrated face elevated kidney stress — this formula addresses that alongside its primary magnesium benefits.
Magnesium is lost through sweat with every workout. Roughly three out of four American adults already fall short of the recommended daily intake — for athletes training multiple hours per day, that gap is wider and the consequences (muscle cramps, poor sleep, cardiac irregularities, fatigue) show up faster. A daily powder format makes consistent replenishment simple.
How to Use Thorne Magnesium Citrate
Daily Dose: Mix 1 scoop into 8–12oz of water and drink once daily. The citrus berry flavor dissolves quickly — works well as a morning supplement drink or an evening wind-down routine.
Timing for GI Support: For athletes using this product specifically to support bowel regularity, taking it in the evening or before bed works well, as magnesium's relaxing effect on smooth muscle aligns with overnight gut motility.
Pro Tip: Start with one serving daily and assess your response. Magnesium citrate's laxative effect is dose-dependent — if stools become too loose, reduce to a half serving and build back up.
- Gluten free
Supplement Facts
60 Servings / Citrus Berry
Serving Size: One Scoop
Serving Per Container: 60
| Amount Per Serving | ||
|---|---|---|
| % Daily Value* | ||
| Magnesium (as Magnesium Citrate) 250mg | ** | |
* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Daily Value (DV) not established
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Thorne Magnesium Citrate FAQ's
Everything you need to know before getting started.
Magnesium citrate is one of the most bioavailable forms of magnesium — it's absorbed efficiently and works alongside the citrate ion to support healthy kidney function. Magnesium malate pairs magnesium with malic acid, a compound directly involved in the energy production cycle your cells use to generate ATP. Both forms are well-absorbed; the combination addresses muscle function, energy production, and overall replenishment simultaneously.
Each capsule delivers 135mg of elemental magnesium — 55mg from magnesium citrate and 80mg from magnesium malate. At the standard three-capsule daily dose, that's 405mg of elemental magnesium, close to the FDA's recommended daily intake of 420mg for adults.
Magnesium is lost through sweat, and endurance athletes sweat a lot. High training volume also increases the rate at which your body depletes magnesium through the enzymatic processes that power exercise. Roughly three out of four U.S. adults already fall short of recommended intake — for athletes with higher baseline needs, the gap is wider and the consequences (muscle cramps, poor sleep, fatigue, irregular heart rhythm) show up faster.
Some individuals experience gas, bloating, or loose stools when taking magnesium supplements, particularly at higher doses. Starting with one capsule daily and building up gradually minimizes this risk. If loose stools occur, reducing the dose resolves it. Taking with food also helps.
Many athletes split their dose across meals — for example, one capsule with breakfast and one with dinner. Taking a dose in the evening supports muscle relaxation and nervous system recovery, which can improve sleep quality. Avoid taking large amounts on an empty stomach if you're sensitive to digestive effects.