Jigsaw Health is a family-owned nutritional supplement company best known for its time-release magnesium tablets and electrolyte powders. Founded in 2005 by Pat Sullivan and his son Patrick Sullivan Jr., the company’s core focus is helping people correct magnesium deficiency without the digestive issues that standard magnesium supplements commonly cause. Their flagship product, MagSRT, uses a sustained-release delivery system designed to release magnesium gradually into the body over several hours.
How MagSRT Works
The centerpiece of Jigsaw Health’s lineup is MagSRT, which stands for “Magnesium with Sustained Release Technology.” Most magnesium supplements deliver their full dose at once, which can overwhelm the gut and cause loose stools or cramping. MagSRT uses a proprietary tablet design that releases magnesium slowly, giving your body more time to absorb it in smaller amounts.
The active ingredient is dimagnesium malate, a patented form of magnesium bound to malic acid. A full daily serving (four tablets) provides 500 mg of magnesium and 1,436 mg of malic acid. Malic acid plays a role in your cells’ energy production cycle, which is why some users report improved energy alongside the magnesium benefits. The standard version of MagSRT also includes B vitamins (B6, B12, and folate), though Jigsaw offers a “B-Free” version without them.
What the Clinical Research Shows
Jigsaw Health funded a clinical trial called the Scottsdale Magnesium Study, published in the Journal of the American College of Nutrition. The study found that more than 75% of participants started with suboptimal magnesium levels in both their blood serum and red blood cells, which aligns with broader estimates that most adults don’t get enough magnesium from food alone.
After taking MagSRT for 90 days, participants saw a 30% increase in red blood cell magnesium, which is the more meaningful marker of long-term magnesium status. Results showed up earlier too: a 6% increase after just 30 days. Symptom scores, covering things like muscle cramps, fatigue, and sleep quality, improved 28% at the 30-day mark and 63% at 90 days.
On the absorption side, blood magnesium levels rose 22% within four hours of taking two tablets, then decreased only 5% over the next four hours. That gradual tapering suggests the sustained-release mechanism does extend absorption compared to standard supplements. Digestive tolerance was high: 91% of participants reported no significant gastrointestinal discomfort.
Electrolyte Supreme: The Hydration Product
Jigsaw’s other main product is Electrolyte Supreme, a powder you mix with water. It targets hydration and is particularly marketed toward athletes and pickleball players. Each 3.7-gram serving delivers 270 mg of sodium, 210 mg of potassium, and 600 mg of chloride, along with smaller amounts of calcium, magnesium, zinc, and selenium. It also contains B vitamins in their active, bioavailable forms.
The formula is sweetened with stevia leaf extract and monk fruit rather than sugar, and gets its color from beet juice, beta-carotene, and hibiscus concentrate. It’s designed as a daily electrolyte drink rather than a high-sodium emergency rehydration product, so the mineral amounts are moderate compared to some competitors.
Quality Testing and Transparency
Jigsaw Health runs a “Label Claim Verified” program where third-party lab results for every product batch are posted on each product page. These results confirm that the actual ingredient amounts match what’s printed on the label, and they include testing for heavy metal traces. This is a voluntary step that goes beyond what the supplement industry requires, though it’s worth noting it’s not the same as earning a certification from organizations like NSF or Informed Choice.
What to Realistically Expect
If you’re considering Jigsaw’s magnesium, the clinical data suggests meaningful improvements in magnesium status within 30 days, with more substantial changes by 90 days. That timeline tracks with how the body works: magnesium needs to build up inside your red blood cells, not just circulate in your bloodstream temporarily. The 500 mg daily serving in MagSRT exceeds the general recommended daily amount of 350 to 420 mg for adults, but because it’s released gradually and magnesium malate is relatively gentle, most people tolerate it well.
The evidence on magnesium for specific symptoms like muscle cramps is still mixed overall. Some studies have found that 300 mg daily for six weeks reduced cramp frequency, while a 2021 review found no conclusive evidence for that benefit. What is well established is that correcting a genuine magnesium deficiency improves energy, sleep, and muscle function. The question for any individual is whether low magnesium is actually driving their symptoms, something a simple blood test can help clarify.