If you have looked at more than one sleep supplement, you have seen these three names. Magnesium, valerian, and L-theanine show up across the category, sometimes alone and sometimes together. They are not interchangeable. Each works in a different way, suits a different kind of sleeper, and acts on a different timeline.
This page compares all three side by side, then goes deeper on each one, so you can match the ingredient to the problem you are actually trying to solve.
Quick comparison
| Ingredient | How it works | Research strength | Best for | Typical onset |
| Magnesium (as glycinate) | A mineral involved in normal nervous system and muscle function that supports relaxation* | Well established as an essential mineral; widely studied | People who want steady, foundational support for calm and rest | Gradual; builds with consistent daily use |
| Valerian | A botanical traditionally used and studied for its role in supporting restful sleep* | Studied, with mixed findings | People who prefer a plant based option for winding down | Varies by person |
| L-Theanine | An amino acid from tea that promotes a calm, relaxed state without sedation* | Growing body of research | People with a busy or racing mind at bedtime | Relatively quick, often within the first hour |
Use the table to narrow your choice, then read the section that fits your situation.
Magnesium: foundational calm
Magnesium is an essential mineral your body uses for hundreds of normal processes, including nervous system and muscle function. When people talk about magnesium for sleep, they are usually pointing at that connection to relaxation and a settled body at the end of the day. A systematic review examined magnesium's role in sleep health, noting its involvement in GABA receptor regulation[1]. and a settled body at the end of the day. A 2023 systematic review examined magnesium's role in sleep health, noting its involvement in GABA receptor regulation and nervous system function[1]. and a settled body at the end of the day.*
The form matters. Magnesium glycinate pairs the mineral with the amino acid glycine, which tends to be gentle on digestion compared with cheaper forms like magnesium oxide. That makes it a practical choice for nightly use.
Magnesium is not a fast acting switch. It works best as part of a consistent routine, supporting relaxation over time rather than knocking you out within minutes.* If you want the full breakdown, see our guide to magnesium for sleep.
Valerian: a plant based option for winding down
Valerian is a botanical that has been used traditionally for rest and has been studied for its role in supporting restful sleep. A 2020 systematic review evaluated the available evidence on valerian root for sleep quality[2]. and has been studied for its role in supporting restful sleep in a 2020 systematic review.* It is one of the more familiar herbal options in the category, which is why it sits in this comparison.
Responses to valerian vary from person to person, and the research is mixed rather than uniform. Some people find it a useful part of an evening wind down routine, and others notice little. Because of that variability, it is best thought of as one option to evaluate rather than a guaranteed result.
If a plant based approach appeals to you, valerian is worth understanding alongside the calming amino acids below, since they target different parts of the wind down process.
L-Theanine: for a busy mind at bedtime
L-Theanine is an amino acid found naturally in tea leaves. It is associated with a calm, focused, relaxed state, and notably it supports that calm without the heavy sedated feeling some people want to avoid. A 2025 systematic review found that L-theanine consumption improved sleep outcomes across multiple studies[3]., and notably it supports that calm without the heavy sedated feeling some people want to avoid.*
That profile makes L-theanine a good fit for the bedtime problem that is mental rather than physical: the mind that keeps replaying the day, planning tomorrow, or simply will not settle. It also tends to act relatively quickly compared with a mineral like magnesium, which is part of why the two are often combined.* For more depth, read our article on L-theanine for sleep.
How they work together
These three are popular as a stack because they cover different bases rather than repeating the same one.
- Magnesium offers steady, foundational support for relaxation that builds with regular use.*
- L-Theanine addresses the mental side, helping quiet a busy mind closer to lights out.*
- Valerian adds a traditional botanical layer for people who want a plant based element in their routine.*
The point of combining is coverage. A formula that leans only on one mechanism asks that single ingredient to do everything. Pairing a fast acting calming amino acid with a foundational mineral gives you both the in-the-moment and the over-time angles in one routine.*
Falling asleep vs staying asleep
The most useful question is not which ingredient is strongest. It is what kind of sleep trouble you have.
Trouble falling asleep. If the issue is getting to sleep in the first place, the faster acting, mind calming side of the picture tends to matter most. L-theanine fits here, and many people who struggle at the start of the night also use a small, balanced amount of melatonin to support their natural sleep onset.*
Trouble staying asleep. If you fall asleep fine but wake during the night, the goal shifts toward steady, sustained relaxation rather than a quick push into sleep. This is where foundational support from magnesium and calming amino acids, used consistently, fits the pattern, and where many people specifically want to avoid melatonin. Our overview of non-melatonin sleep aids covers that approach in more detail.
Matching the ingredient to the timing of your problem is what turns a generic supplement into a useful one.
Where Sandland fits
Sandland builds formulas around this logic rather than around a single trendy ingredient.
Stay Asleep is designed for people who fall asleep but wake during the night. It combines magnesium glycinate, valerian root, and L-theanine with other calming botanicals, and it is melatonin free and non habit forming, so it can be used as part of a nightly routine focused on staying asleep.*
Deep Sleep is built for the other problem: trouble falling asleep. It combines L-theanine, GABA, and magnesium glycinate with a small, balanced dose of melatonin to support natural sleep onset, rather than relying on a heavy melatonin dose alone.*
If your main issue is getting to sleep, Deep Sleep may be a better fit. If you wake in the night and want to stay asleep without melatonin, Stay Asleep may be the better match.
FAQ
Can I take magnesium, valerian, and L-theanine together? They are often combined because they support relaxation through different mechanisms rather than duplicating one.* As with any supplement, it is sensible to check with your healthcare provider about your specific situation, especially if you take other medications.
Which one is best for falling asleep versus staying asleep? For falling asleep, the faster acting, mind calming side, including L-theanine and sometimes a small melatonin dose, tends to fit. For staying asleep, steady foundational support from magnesium and calming amino acids used consistently fits the pattern better.*
Will these make me groggy or are they habit forming? The ingredients here are not sedatives in the pharmaceutical sense, and L-theanine in particular is associated with calm without heavy sedation.* Sandland's Stay Asleep is also formulated to be non habit forming.
How long do they take to work? L-theanine tends to act relatively quickly, often within the first hour. Magnesium works more gradually and is best used consistently over time. Valerian responses vary from person to person.*
Are these options melatonin free? Magnesium, valerian, and L-theanine are all melatonin free on their own. Sandland's Stay Asleep is melatonin free, while Deep Sleep includes a small, balanced dose of melatonin for people who have trouble falling asleep.
*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.
