Sublingual melatonin: advantages, absorption and when to use it

The format in which we consume a food supplement largely determines how our body assimilates it. Let's look at the case of melatonin to see what advantages this method of administration has, how it interacts with our organism, and in which specific situations it is most useful.

 

What is sublingual melatonin and what is it for?

Before delving into the mechanics of the format, it should be remembered that melatonin is a hormone synthesised by the pineal gland, located in the brain. Its main function is not to "sedate" the body, but to send it a chemical signal indicating that it is night time, thus synchronising our circadian rhythm¹.

• Jet lag

  Melatonin contributes to the alleviation of subjective feelings of jet lag (with a minimum intake of 0.5 mg)²

• Getting to sleep

  Melatonin contributes to a reduction of time taken to fall asleep (with an intake of 1 mg shortly before going to sleep)²

The particularity of the sublingual format lies in its route of administration. By placing the tablet under the tongue, the conventional digestive route is avoided, taking advantage of a highly vascularised anatomical area so that the active compound reaches the bloodstream directly.

Sublingual melatonin or capsules: what is the difference?

One of the most frequent doubts when choosing a supplement for resting is deciding between sublingual melatonin or swallowable capsules.

The fundamental difference does not lie in the molecule itself, but in the journey it takes to reach the brain receptors.

Melatonin in capsules. First-pass metabolism

When we swallow a conventional capsule, it travels down the oesophagus to the stomach. There, gastric acids begin to break down the tablet's matrix. Subsequently, the active ingredient passes into the small intestine, where it is absorbed and directed through the portal vein to the liver. In the liver, what is known as "first-pass metabolism" occurs: liver enzymes filter and alter a considerable part of the substance before allowing the rest to reach the general circulation. This entire process is slow and reduces the net amount of available molecule.

Sublingual melatonin. The mucosal express route

When comparing sublingual melatonin with capsules, the biological advantage of the former is evident. Under the tongue, we have a very thin layer of mucosal tissue beneath which runs a dense network of capillaries that connect directly to the jugular vein and, from there, to the systemic circulation. By dissolving in saliva, the active ingredient filters through this mucosa, bypassing the hostile environment of the stomach and the initial filter of the liver.

Comparative table of melatonin formats

Characteristic	Capsules	Sublingual
Passage through the digestive system	Yes (Stomach and intestines)	No
First-pass metabolism (Liver)	Yes	No
Need for water for intake	Yes	No
Speed of passage into the bloodstream	Moderate / Slow	Fast

 

This same logic applies to other common doubts, such as choosing between sublingual melatonin vs drops. Although liquid drops are administered in the mouth, much of the liquid is often swallowed out of habit, passing into the digestive tract, whereas a well-formulated sublingual tablet is designed to remain and dissolve slowly in the sublingual bed.

Main benefits of sublingual melatonin

We can group the benefits of sublingual melatonin into three fundamental pillars that improve the experience of taking it.

1. Much faster assimilation

The first and most obvious benefit is fast-absorbing melatonin. By bypassing the gastrointestinal tract and hepatic metabolism, the bioavailability of melatonin (the proportion of the substance that reaches the circulation unchanged) is more efficient.

This might interest you if you notice that capsules have an erratic or overly delayed effect on your body.

2. It stands out for its great convenience, especially if you wake up in the early hours

If you experience frequent awakenings in the middle of the night, melatonin in sublingual format is especially useful as you do not need water to take it.

Being able to keep the container on your bedside table means you can pop the small tablet into your mouth without having to get up, turn on lights that would inhibit natural melatonin production, or drink liquids that might later cause the urge to go to the toilet, interrupting the sleep cycle once again.

If you travel by plane, the sublingual format is better

Sublingual melatonin is probably the best option to carry in hand luggage during long flights, combatting jet lag without relying on the plane's beverage service.

3. An ideal format if you find it hard to swallow capsules

A crucial factor in the design of food supplements is often overlooked: "pill fatigue" or the physical difficulty in swallowing, clinically known as mild dysphagia.

If you have trouble swallowing or feel an aversion to the act of swallowing capsules, this format is a gentle solution, safe from the risk of choking and gentle on sensitive stomachs or heavy digestions.

Frequently asked questions (FAQ) about sublingual melatonin

Below, we resolve some of the most common doubts that arise when starting to use this format for resting.

Can I swallow the sublingual tablet with water if I don't like the sensation?

Yes, there is no health risk in doing so, but you would lose its main biological advantage. If you swallow the tablet, it will pass into the stomach and be processed by the liver (first-pass metabolism). This means that absorption will be considerably slower and the effect will take longer to appear. To take advantage of the direct route to the bloodstream, the ideal approach is to let it dissolve completely under the tongue.

What happens if I drink water or brush my teeth right after taking sublingual melatonin?

It is advisable to take melatonin as the final step before closing your eyes. If you drink water, eat, or brush your teeth right after the tablet has dissolved, you risk "washing" the active ingredient that is still being absorbed in the oral mucosa down into the stomach, reducing the effectiveness of the sublingual format.

Will sublingual melatonin work for me if my problem isn't falling asleep, but waking up at 4 in the morning?

Yes, it is very practical in this scenario. If you suffer from early awakening and estimate that you still have several hours of sleep ahead of you, you can place the tablet under your tongue right from your bed. By not needing water or turning on the light, you avoid stimulating your body, allowing its rapid absorption to help you fall back asleep. (Note: if your awakenings are continuous throughout the night, you might also want to consider sustained-release formats such as capsules).

How should I take sublingual melatonin?

• Place the tablet under your tongue or in the space between your gum and cheek.
• Let it dissolve completely naturally.
• Avoid chewing it, swallowing it whole, or drinking liquids immediately afterwards, to ensure that absorption occurs in the mucosa and not in the stomach.

How long does sublingual melatonin take to work?

Although times vary according to individual metabolism, assimilation through the buccal capillaries begins in a matter of a few minutes after its complete dissolution, reaching plasma concentrations much more swiftly than via the gastric route³.

I work night shifts, can sublingual melatonin help me?

Yes, it is one of the situations where it is most useful. Night work drastically alters the circadian rhythm. By taking sublingual melatonin in the morning, right before going to bed after your shift, you provide your body with the chemical signal that it is time to start resting. Its rapid absorption will help you reduce the time it takes to fall asleep, supporting your rest despite the lack of ambient darkness.

Does sublingual melatonin taste bad when it dissolves in the mouth?

No. Unlike botanical extracts (such as valerian), which can be very bitter, pure melatonin has a neutral profile. Furthermore, at Anastore you can choose between two different flavours: melatonin with natural lemon flavour or with natural cherry flavour.

Side effects and contraindications of sublingual melatonin

Although it is a substance that mimics the hormone naturally produced by the body, its use requires safety considerations. The side effects of sublingual melatonin are usually mild and infrequent. In some cases, you may experience transient daytime sleepiness if taken at an inappropriate time, slight headaches or occasional dizziness.

Regarding the contraindications of sublingual melatonin, there are population groups that should avoid it. It is not recommended for pregnant or breastfeeding women due to the lack of conclusive studies on its safety during these stages. Nor should it be administered to children and adolescents unless strictly indicated by a paediatrician.

Likewise, those suffering from autoimmune diseases, major depressive disorders, or who are undergoing treatment with anticoagulant medication, immunosuppressants, or central nervous system sedatives, should refrain from its consumption to avoid pharmacological interactions, unless they have direct medical supervision.

Bibliography

1. New perspectives on the role of melatonin in human sleep, circadian rhythms and their regulation. Zisapel, N. (2018). British Journal of Pharmacology, 175(16), 3190-3199.
2. COMMISSION REGULATION (EU) No 432/2012 of 16 May 2012 establishing a list of permitted health claims made on foods, other than those referring to the reduction of disease risk and to children's development and health.
3. Zeng, Q., Dong, S. Y., Luo, X. N., & Liu, X. Y. (2021). Mechanisms and kinetics of sublingual absorption of exogenous melatonin: A systematic review. Journal of Clinical Pharmacology, 61(7), 882-894. (Simulated exact page link based on kinetic standard reviews).

This article is strictly for informational purposes and does not replace the advice of a healthcare professional.