Magnesium Bisglycinate for Sleep: What the 2025 Research Shows

“Take magnesium for sleep” is one of the most common wellness tips out there. But does the science actually back it up — and does the type of magnesium matter? Here is a clear look at the most recent research.

What magnesium does in the body

Magnesium is a cofactor in more than 300 enzyme reactions. When it comes to rest, two roles stand out: it supports normal nervous-system function and it helps the body regulate the calming neurotransmitter GABA. In plain terms, magnesium helps your nervous system shift out of “go” mode — which is precisely what you want in the hour before bed.

The 2025 clinical trial

A randomized, double-blind, placebo-controlled trial published in Nature and Science of Sleep (2025) is one of the better-designed studies to date. Researchers followed 155 healthy adults who reported poor sleep and gave them either 250 mg of elemental magnesium as bisglycinate or a placebo for four weeks (PubMed).

Key findings:

• The magnesium group showed a greater improvement in insomnia-severity scores than placebo by week four.
• The benefit was strongest in people whose dietary magnesium was below average — a big group, since many adults do not hit the recommended intake.
• No serious side effects were reported over the study period.

An honest note on expectations

We believe in being straight with you. The researchers described the effect as modest — magnesium is a gentle, supportive nutrient, not a sedative or a sleeping pill. It works best as one part of a good wind-down routine, and it tends to shine most for people who were low in magnesium to begin with. That is realistic, and it is exactly how a daily supplement should work: quietly, over time, supporting your body’s own rhythms.

Why bisglycinate specifically

The form of magnesium changes how much you actually absorb and how your stomach handles it:

• Magnesium oxide — inexpensive, poorly absorbed, often causes loose stools.
• Magnesium citrate — better absorbed, but can be laxative at higher doses.
• Magnesium bisglycinate — magnesium chelated to glycine, well absorbed and typically gentle on digestion. Glycine itself is a calming amino acid.

That combination of absorption and comfort is why we chose bisglycinate for Sleep + Stress 40+.

The bottom line

Magnesium bisglycinate is a well-tolerated, research-supported way to support relaxation and restful sleep — especially if your diet runs low on magnesium. It is not a magic bullet, but as part of a consistent evening ritual, it is one of the most sensible nutrients to have in your corner.

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These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for educational purposes only and is not medical advice. Consult your healthcare provider before starting any supplement, especially if you are pregnant, nursing, or taking medication.