Melatonin: what it is, what it's for, and how to take it.

Melatonin has become, in just a few years, the "star" supplement for those desperate for... Sleep better. It's available in pharmacies, drugstores, and online stores, promising perfect nights in small, seemingly harmless pills.

If you're thinking about starting to take melatonin, or if you're already using it and still have questions, this guide was written for you. We'll explain what this hormone is, what it's actually used for, in what situations supplementation makes sense, and how to take it responsibly without putting your health at risk.

You'll also understand why a supplement, by itself, rarely solves years of bad nights. Often the solution involves changing habits, treating underlying causes and, when necessary, resorting to... sleep therapy with expert guidance, instead of relying solely on a pill at bedtime.

Before deciding, start from the beginning: what exactly is melatonin, how does it act in the brain, and why do some people feel a difference... and others don't?

What is melatonin?

Melatonin is a hormone produced primarily by the pineal gland, a small structure in the brain that functions as part of our "“biological clock”"Internal. When it gets dark, the eyes send a signal to the brain, and this gland increases the release of this substance, helping the body prepare for sleep.".

The levels of this hormone rise at nightfall, peak in the middle of the night, and fall again near waking time. This movement helps coordinate the sleep-wake cycle, body temperature, and various metabolic processes. When there is intense light at night, irregular schedules, or screens used late into the night, this natural dance becomes disrupted.

How does melatonin work?

With age, many people produce less melatonin. Night shifts, jet lag, chronic exposure to artificial light, and some illnesses can also alter its release. This is where supplements come in. supplements, designed to mimic the nighttime surge of this hormone and "push" the body toward sleep.

Natural melatonin vs. supplements

The body produces melatonin naturally, from amino acid tryptophan and with the help of stable light and dark routines. Supplements, on the other hand, provide an external dose of the same hormone, in tablets, capsules, drops, sprays, or immediate and prolonged-release formulas.

In practice, the goal is the same: to give the brain a clear signal that "it's nighttime." But it's important to remember that, unlike the hormone the body produces, the supplement bought in a bottle enters a complex system where sleep problems, stress, medication, and associated illnesses already exist. Therefore, it shouldn't be used as if it were a harmless pill.

What is this sleep hormone for?

There are increasingly more studies on this hormone, but that doesn't mean it's a magic solution. What research consistently shows is a moderate benefit in some specific situations, especially those related to the biological clock and difficulties falling asleep.

Insomnia and difficulty falling asleep

In people who have difficulty initiating sleep, melatonin can shorten the time to fall asleep by a few minutes and slightly increase the total duration of sleep. Meta-analyses of clinical trials show a modest but real improvement in parameters such as sleep latency and overall sleep quality when compared to placebo.

These effects are most evident in cases of insomnia associated with irregular schedules, jet lag, or changes in circadian rhythm, and less clear in long-term chronic insomnia, where cognitive-behavioral therapy and a structured approach to sleep disorders They tend to bring more lasting results.

Jet lag, disrupted rhythms, and shift work.

When we cross multiple time zones or work nights, our internal clock becomes out of sync with the environment. In these contexts, melatonin can be particularly useful because it acts as an "artificial night" signal, helping the brain to readjust.

International guidelines suggest using this hormone in low doses for long journeys east or west, or for people with rhythm disturbances such as delayed sleep phase syndrome. The combination with strategic light exposure, explained in detail in our guide... circadian rhythms, It is usually more effective than the isolated supplement.

Other contexts under study

Melatonin has also been studied as an adjunct in problems such as chronic pain, migraine, preoperative anxiety, symptoms in neurodegenerative diseases, and seasonal depression. In many of these cases, the results are promising but still inconsistent, and the hormone is not considered a first-line treatment.

Is melatonin safe? Benefits, risks, and side effects.

Used in the short term and in low doses, melatonin is generally well tolerated by most healthy adults. Many studies have found no serious side effects when taken for a few weeks or months, especially at doses of 2-3 mg or less per night.

However, like any active substance, it is not without risks. Common side effects include morning drowsiness, more vivid dreams, headaches, dizziness, slight mood changes, or gastrointestinal discomfort. In some people, especially those with a history of depression or anxiety, this hormone may worsen symptoms.

In recent years, additional concerns have arisen regarding prolonged use, especially at high doses. Observational studies point to a possible association between daily consumption over long periods and a higher risk of cardiovascular problems, although it cannot yet be said to be the direct cause of these problems. This reinforces the idea that the supplement should be seen as temporary support, not as a permanent solution.

Another important point is product quality. In some countries, laboratory analyses have revealed large variations between what is on the label and the actual dose present in the tablets. This means that two brands with the same declared dose can have very different effects. Therefore, it is essential to follow the guidance of a healthcare professional and avoid random online purchases.

In children, adolescents, pregnant women, people with epilepsy, autoimmune diseases, hormonal problems, liver failure In individuals with kidney or renal impairment, the use of this hormone should always be carefully considered in consultation with the attending physician. In these groups, self-medication can be particularly risky.

How do I take melatonin?

If, after a proper clinical evaluation, you decide to use melatonin, it's important to do so strategically, and not "blindly." The dose, timing, and duration of use make all the difference between a subtle relief and even more troubled nights.

Most studied doses in adults

Scientific literature shows that low doses of this hormone, between 1 and 3 mg in adults, are usually sufficient for most sleep-related indications. Recent readings indicate that, on average, the beneficial effect tends to stabilize around 3–4 mg, with no consistent gain at much higher doses.

In practice, many experts recommend starting with the lowest possible dose and only increasing it if necessary, always under medical supervision. In Portugal, there are differences between over-the-counter supplements and prescription medications, and it is the healthcare professional who can best assess your specific case and determine the appropriate formulation.

When to take

A common mistake is taking melatonin right before bed, when insomnia is at its peak. Ideally, in most cases, it should be taken some time before the desired bedtime, so that peak concentration coincides with the moment you want to fall asleep.

Depending on the formulation and purpose, the supplement is generally taken between 30 minutes and 2 hours before bedtime. In cases of rhythm disturbances, such as delayed sleep phase syndrome, the schedule can be adjusted more precisely within a plan designed during consultation, combining this hormone with light exposure and restructuring of schedules.

How long to use

In most situations, the supplement is used for a few weeks while lifestyle changes are implemented and schedules are stabilized. Prolonged use should be reserved for specific cases and monitored by professionals, with regular reviews of benefits and possible undesirable effects.

If you notice that, even with melatonin, you still have a long time to fall asleep, wake up frequently during the night, or feel exhausted during the day, the most important thing is not to increase the dose, but rather to reassess the underlying problem – you may be facing a disorder such as... sleep apnea, Restless legs syndrome, anxiety, or depression, which require specific approaches.

Who should not take it without medical evaluation?

There are groups in which the use of this substance should never be a decision made solely by the individual or a family member. These include, for example:

• • children and teenagers;
  • pregnant or breastfeeding women;
  • individuals with epilepsy or a history of seizures;
  • who have significant autoimmune, hormonal, or psychiatric disorders;
  • Anyone taking anticoagulants, antihypertensives, sedatives, antidepressants, or other medications that affect the central nervous system;
  • people with significant liver or kidney disease.

In these cases, the doctor assesses risks, interactions, and alternatives. Often it is possible to devise a plan in which the supplement This only comes into play in an initial phase, while other strategies gain ground.

Melatonin isn't everything: habits, environment, and sleep therapy.

Some people who try melatonin feel little or no difference. Not because the hormone "doesn't work," but because the main problem isn't a lack of it. It's related to schedules, stress, electronic devices, caffeine in the late afternoon, or undiagnosed illnesses.

That's why any use of supplements should be accompanied by a serious review of your routine, of what you consume. sleep hygiene It really works, and what, in practice, needs to be adjusted in your daily life. Small, consistent changes often have more impact than any single pill.

If you suspect you have a specific disorder, such as sleep apnea, involuntary leg movements, recurring nightmares, or waking up with a feeling of suffocation, the path forward involves a thorough diagnosis and an integrated treatment plan, rather than accumulating supplements haphazardly.

When we work in individual follow-up of sleep therapy, This hormone can be one tool among many: sometimes it is introduced at the beginning to correct schedules and then withdrawn as sleep becomes more stable and autonomous again.

How do I know if this supplement is right for me?

Before buying a bottle, it might be helpful to ask yourself a few honest questions:

• How long have I been sleeping poorly? Weeks, months, years?
• Have I already tried changing schedules, reducing screen time at night, limiting caffeine and alcohol, and improving the bedroom environment?
• Do I snore a lot, have pauses in my breathing, wake up gasping for air, or with a very dry mouth?
• Do I always wake up at the same time in the middle of the night, with racing thoughts or anxiety?
• Is taking melatonin a way to avoid the problem, or is it part of a plan developed with a professional?

If you answered “yes” to several of these points, especially when there are signs of apnea, anxiety, or depression, the best next step is not to choose a dose on your own, but to schedule a specialist evaluation. A good sleep plan starts with understanding what is happening, not with adding pills.

In some cases, a short course of supplementation combined with well-guided routine changes may be sufficient. In others, the priority is to treat a specific disorder or completely reorganize your day, and hormones may not even be necessary. The most important thing is that the decision is informed, well-considered, and made in conjunction with your doctor or psychologist.

Conclusion

Melatonin is neither a villain nor a miracle. It's a useful tool for correcting sleep schedules, alleviating jet lag, and, in certain cases, making it easier to fall asleep – provided it's used in the right dose, for the appropriate duration, and integrated into a larger sleep management plan.

What truly changes your energy during the day isn't a bottle in your bedroom, but how you treat your body and mind in the 24 hours before bed. Consistent routines, adequate light exposure, stress management, and, whenever necessary, structured support are key. fall asleep faster without medication They are part of this equation.

If you feel like you're hoarding supplements and still not getting the sleep you need, perhaps the most important question to ask is: "What is my body really trying to tell me?"“

Instead of just reaching for more pills, it might be time to look at the root of the problem and consider sleep therapy, which focuses on treating the causes rather than just eliminating symptoms.