Sleep supplements: magnesium, melatonin and what science says
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More and more supplements promise better nights. Some help, others are marketing exaggerations. Before spending money, it's worth understanding what each one does — and what it doesn't do.
I'm Ana Cristina, Dreamura's Sleep Advisor. Here's what I usually explain to people who ask me about supplements.
First, what's underneath the supplement
No pill compensates for a room with too much light, a mattress that no longer supports you, or a routine without set times. The supplement is the last layer, not the first.
If you've been sleeping poorly for weeks, start with the basics before buying bottles: sleep hygiene, regular hours, and a dark, cool room.
Magnesium
It's the most sought after. The form with the best digestive tolerance is magnesium glycinate. It helps with muscle relaxation and can ease falling asleep, especially if you have a deficiency.
Typical dose: 200 to 400 mg, about an hour before bed. It's not a sedative — it doesn't knock you out, it just lowers tension.
Melatonin
Melatonin is not a sleeping pill. It's the hormone that signals to the body that it's night. It works better for readjusting the internal clock — jet lag, shift work, going to bed too late — than for classic insomnia.
Low doses, between 0.5 and 1 mg one to two hours before bed, are usually enough. More is not better. In Portugal, above 1.9 mg, it stops being a supplement and becomes a medicine.
If you want to understand in detail when to choose one or the other, I wrote a dedicated guide: magnesium or melatonin, which really helps you sleep.
L-theanine
An amino acid found in green tea. It promotes a calm state without causing drowsiness. Typically, 100 to 200 mg is used, alone or with magnesium, to reduce mental agitation before bed.
Teas: valerian and chamomile
Valerian has some evidence for helping you fall asleep. Chamomile is more ritual than potent. Part of the effect of a hot tea comes from the habit of slowing down — and that, in itself, already helps.
What to do first
In order: regular hours, a dark and cool room, and a mattress and pillow that truly support you. Only then do I think about magnesium or L-theanine as a booster.
If you wake up with pain or toss and turn all night, the problem is rarely a lack of supplements.
"A supplement helps you fall asleep. A good mattress determines how you wake up." — Ana Cristina, Dreamura Sleep Advisor
Note: this information is general and does not replace medical advice. If you are pregnant, breastfeeding, taking medication, or have a health condition, speak to your doctor before taking any supplements.
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