Short version: Magnesium citrate is one of the most studied and most bioavailable forms of magnesium. The laxative reputation it has comes from its use at high doses (400-600mg+) — at sleep-friendly doses around 170mg, it's gentle on the stomach and well-suited to a nightly habit. Glycinate is a fine alternative; both work via the same magnesium-GABA pathway. The form is less important than the dose, the consistency, and getting the magnesium into your system in the first place.
Why magnesium matters for sleep
Magnesium is involved in over 300 enzymatic reactions in the body. The two that matter most for sleep are the same regardless of which form you take:
- GABA system support. Magnesium binds to and modulates GABA receptors — the same receptors that benzodiazepines work on. GABA is the brain's main calming neurotransmitter. More effective GABA signalling means a more easily quieted nervous system.
- NMDA receptor regulation. Magnesium acts as a "plug" on NMDA glutamate receptors, dampening the excitatory drive that keeps your brain firing. Low magnesium → over-active NMDA signalling → harder to wind down.
This is why low magnesium status is associated with insomnia, restless sleep, and increased nighttime wakings — and why supplementation tends to help most in people who are running low.
Why deficiency is common
Modern diets are lower in magnesium than they used to be. Estimates suggest 1 in 3 Australian adults consume less than the recommended daily intake, with rates higher among:
- People who train hard (sweat losses)
- People who drink coffee or alcohol regularly (both increase excretion)
- People on certain medications (diuretics, PPIs)
- Older adults (absorption declines with age)
You don't need to be deficient to benefit from supplementation, but you'll feel it more if you are.
The forms, briefly
Magnesium is always paired with another molecule (a "ligand") because elemental magnesium doesn't exist on its own in supplements. The ligand changes how it's absorbed, how it feels in your stomach, and what other effects it might bring.
| Form | Bioavailability | GI effect at low dose | Best for |
|---|---|---|---|
| Citrate | High | Gentle (under ~300mg) | General supplementation, sleep, daily use |
| Glycinate | High | Gentle | Sleep, anxiety, sensitive stomachs |
| Oxide | Low (~4%) | Strong laxative | Avoid for daily use — most of the dose isn't absorbed |
| Threonate | Crosses blood-brain barrier | Gentle | Cognition (small evidence base) |
| Malate | High | Gentle | Energy / fibromyalgia |
The "citrate is a laxative" claim, examined
Citrate's reputation as a laxative is real — but it's dose-dependent. The same compound used in over-the-counter constipation products comes at 250-500mg of elemental magnesium per dose taken on an empty stomach. At those amounts, citrate pulls water into the bowel via its osmotic effect.
The sleep-supportive dose is much lower. Studies on magnesium for sleep typically use 200-500mg per night, and most adults tolerate the lower end of that range with no GI effects. At 170mg per serve, you're well below the threshold where the laxative effect kicks in for the vast majority of people.
So the right framing is: don't take 600mg of citrate before bed and expect to sleep through the night. Do take 170mg with your wind-down routine, and the citrate becomes a great vehicle for delivering bioavailable magnesium to the GABA pathway.
Why we picked citrate
Three reasons:
- Bioavailability. Citrate is consistently rated as one of the better-absorbed forms of magnesium. You actually get the magnesium into your bloodstream, not just through your gut.
- Cost-effective at scale. Magnesium glycinate is more expensive per gram of elemental magnesium. For a daily product priced for actual daily use, citrate lets us deliver a meaningful dose without ballooning the price.
- Well-tolerated at our dose. 170mg is a sleep-friendly dose. We tested this internally and with early customers — no GI complaints, plenty of "I slept better" reports.
Dose
The recommended dietary intake for magnesium in adults is roughly 320mg/day for women and 420mg/day for men. A typical Australian diet covers most of that — supplementation is meant to top up the gap, not replace it. 170mg from LIGHTS OUT taken before bed combines well with what you're already getting from food.
If you want a higher dose, you can take two servings (4 gummies = 340mg) — still well below where most people experience GI effects. Listen to your body.
What to expect
- Night 1-3: Many people notice a calmer wind-down within the first few nights. Drifting off feels easier.
- Week 2-3: Fewer night wakings. Deeper, more restorative sleep starts to compound. If you were running deficient, this is when the bigger shift typically lands.
- Week 4+: Magnesium status is restored. Daily use maintains it. Sleep tends to feel "even" night to night.
Magnesium does not sedate — it doesn't knock you out. It supports the natural pathway your body uses to wind down. Most people wake up clearer, not groggier.
What about glycinate?
Glycinate is a great alternative. If citrate doesn't agree with you (or if you're taking a higher dose for therapeutic reasons), glycinate is gentler and pairs the magnesium with glycine — itself a calming amino acid. Many sleep-focused supplements use it for this reason.
But the difference between citrate and glycinate at our dose is smaller than the marketing makes it sound. Both are well-absorbed, both deliver the magnesium that drives the sleep benefit, and both work via the same downstream mechanism.
Where Project Arete fits
LIGHTS OUT is 170mg of elemental magnesium citrate per serve (two gummies). No fillers, no artificial sweeteners. Designed to be taken 30-60 minutes before bed as part of a wind-down routine. Try a month.
Pair it with creatine in the morning to build the daily stack — performance by day, recovery by night. Read more about the stack here.
Educational content. Not medical advice. Talk to your GP if you're on medication or have a kidney condition.
