Melatonin has become one of the most relevant molecules in the field of well-being and skin care. For years it has been almost exclusively associated with sleep, but the truth is that its role goes much further. And, as often happens when an ingredient gains popularity, myths, half-truths and some exaggerations also arise.
At MEL13, we work with melatonin from a scientific and dermatological approach. For this reason, it is worth pausing for a moment, separating the noise and analyzing what is true and what is not about this interesting active ingredient.
What is melatonin, really?
Melatonin is a molecule produced by the pineal gland, known for regulating circadian rhythms; that is, processes such as our sleep-wake cycle. However, it is also present in many other tissues of the body, including the skin.
In addition, melatonin acts as a powerful antioxidant, anti-inflammatory and cellular modulator, participating in protection, repair and regeneration processes against oxidative stress.
Myth 1: "Melatonin is only for sleeping"
It is the most widespread myth. And also the most incomplete.
It is true that melatonin regulates sleep, but multiple investigations have shown that it also plays a key role as an antioxidant, anti-inflammatory and mitochondrial protector. In the skin, it helps to neutralize free radicals, reduce inflammatory factors and strengthen defense mechanisms against external aggressions such as UV radiation and pollution.
Many studies, such as the one recently published in the International Journal of Molecular Sciences, highlight melatonin's ability to protect skin cells from oxidative damage, inflammatory factors and improve mitochondrial function.
Conclusion: melatonin is not just "the sleep hormone"; it is a biologically very versatile active ingredient.
Myth 2: "Applying melatonin to the skin causes sleepiness"
No. Topical application of melatonin does not induce sleep.
The melatonin used in cosmetics acts locally on the skin. The formulations are designed to prevent its passage into systemic circulation, so it does not regulate circadian rhythms when applied topically.
In fact, its use in dermo-cosmetics is aimed at enhancing nocturnal skin regeneration, taking advantage of the moment when cells activate natural repair processes.
Conclusion: using melatonin in a serum or cream will not make you "fall asleep" after applying it.
Myth 3: "It's a new and little-studied ingredient"
Not at all.
Melatonin was isolated in 1958 and, since then, has been extensively researched. Its role in the antioxidant, anti-inflammatory system and in cell regulation is supported by decades of research and a solid body of scientific literature.
In dermatology, its topical use has gained relevance in recent years due to its antioxidant, anti-inflammatory profile, as well as its ability to activate nocturnal skin repair and regeneration processes.
Scientific evidence comes from peer-reviewed journals such as the Journal of Pineal Research, one of the most recognized publications in the study of this molecule.
Conclusion: we are not facing a passing fad, but an active ingredient with a solid scientific basis.
Myth 4: "Melatonin replaces sunscreen"
Here we must be very clear: no.
Although melatonin has antioxidant and reparative properties, and can help mitigate damage induced by UV radiation, it does not replace photoprotection in any case. It does not block or absorb solar radiation as sunscreens do.
It can act as a complement within a well-structured routine, especially in anti-aging and reparative protocols, but never as a substitute for SPF.
Conclusion: antioxidant and reparative, yes. Sunscreen, no.
Myth 5: "It's only for mature skin"
Not so.
While melatonin is especially interesting in anti-aging routines due to its antioxidant, anti-inflammatory capacity, as well as its role in activating cell repair and regeneration processes, oxidative stress does not understand age. Exposure to pollution, blue light or stress impacts the skin from early stages.
Therefore, it can be part of preventive routines and not only corrective ones.
Conclusion: it is not a matter of age, but of skin need.
Reality: melatonin and the skin's night cycle
During the night, the skin activates repair mechanisms, increases cell renewal and optimizes different metabolic processes. It is in this context that melatonin takes on special meaning in cosmetics when applied at night.
During the day, it acts as a shield against oxidative damage; at night, it supports reparative and regenerative processes. It's like that technical team that works while the stage is empty: it's not seen, but it's decisive.
Reality: context matters
It is not enough to include melatonin in a formula. Its effectiveness depends on the concentration, the stability of the active ingredient and the synergy with other ingredients.
In advanced formulation, melatonin can be combined with active ingredients that enhance its antioxidant, anti-inflammatory and reparative action, leading to more complete and effective treatments.
The key is in the science, not in the label.
Melatonin is not a fad or a simple sleep-related claim. It is a molecule with a solid scientific basis, with antioxidant and anti-inflammatory properties, and with a relevant role in skin protection and regeneration.
However, it is advisable to avoid extremes: it is not miraculous, it does not replace sunscreen and it does not act as a sleeping pill when applied to the skin.
As with any serious active ingredient, its value lies in how it is formulated and how it is integrated into a coherent routine.
And that's where science makes the difference.
