Causes of dark circles under eyes: what really lies behind

The skin under your eyes is thin, and what you see through it is often a mix of things: pigment, blood vessels, shadow and sometimes too little sleep. A single cause is rare. That is why miracle creams disappoint — they attack one piece of a problem that has several.

If you have woken up with two dark patches and do not know what to do, start by working out which kind of dark circle you have. The approach changes with the cause. And there is one sign that justifies a medical appointment — we get to that further down.

Why do I have dark circles if I sleep well?

Sleeping well helps, but it is not the only factor. The scientific review of dark circles describes several possible causes: melanin deposition in the dermis, post-inflammatory hyperpigmentation (for example, after atopic or contact dermatitis), periorbital oedema, superficial blood vessels and shadow caused by skin laxity ¹.

A clinical and instrumental study linked three physiological factors to dark circles: hyperpigmentation, a tendency towards more dilated, thick or numerous capillaries, and thinner skin under the eye ². That explains a lot.

Genetics counts too. The Cleveland Clinic notes that dark circles can run in families — that is, appear in several people in the same biological family ³.

The everyday causes, most common first

Not all causes weigh the same.

1. Genetics and ageing. The Cleveland Clinic lists ageing as one of the most common causes of dark circles ³.
2. Pigmentation. Hyperpigmentation — whether from natural tendency or after inflammation — is one of the factors associated with dark circles ^{1 2}.
3. Visible blood vessels. Dilated or superficial capillaries contribute to the purplish colour ^{1 2}.
4. Not enough sleep. The Cleveland Clinic states that poor sleep habits make the skin under the eyes pale, and suggests at least seven hours of sleep a night ³.
5. Oedema and fluid retention. Periorbital swelling can create shadow and accentuate the dark circle ¹.

In this body of evidence there is no list of foods or screens as a direct cause. If you have heard that salt, coffee or your phone causes dark circles, the link is not established with that solidity. What is described is the effect of sleep and of the skin's characteristics.

What you can change this week

Start with what has the best support. Sleep comes first: the recommendation of at least seven hours a night comes from a clinical source and is concrete ³. It is not a promise that dark circles disappear — it is a measure that reduces the pallor of the skin under the eyes.

Then sun protection. Use sunscreen on the orbital area every day, even under cloud.

If you suspect fluid retention, cutting down on salt in the evening and sleeping with your head slightly raised are sensible measures, but they are not specifically studied in this evidence. Treat them as reasonable habits, not as treatment.

But be careful: the evidence we have here does not cover the efficacy of those ingredients specifically for dark circles. Applying them is a reasonable choice; expecting guaranteed results is not.

What tends not to help (and the advertising that overreaches)

Creams that promise to "eliminate" dark circles in days deserve scepticism. And creams with colourants or reflective particles simply disguise — which is legitimate, as long as you know what you are buying.

There is also no evidence, in this base, that drinking more water on its own resolves dark circles. Hydration matters for skin in general, but the direct relationship with pigmentation or vessels is not established here.

Where supplements fit — and where they do not

If you are looking for a supplement specifically for dark circles, the honest answer is: in this evidence there is no support for that indication. None of the listed ingredients — hyaluronic acid, vitamin C, niacin — has an authorised claim here for dark circles. We are not going to invent one.

That said, hyaluronic acid and vitamin C are common ingredients in skin hydration and firmness formulas. Skin Hydration & Firmness Gummies provide, per 2 gummies, 130 mg of hyaluronic acid, 50 mg of vitamin C (62.5% of the reference value) and 16 mg of niacin (100% of the reference value). Do not exceed the recommended daily dose. Contains polyols; excessive consumption may produce laxative effects. If you are pregnant, breastfeeding, ill or taking medication, speak to a healthcare professional before use.

This is not a treatment for dark circles. It is a food supplement — and food supplements are not a substitute for a varied and balanced diet and a healthy lifestyle. If your goal is specifically the dark circle, your money will probably go further on good sun protection and a tinted sunscreen to disguise it.

When dark circles stop being normal

But there are signs that justify an appointment. The Cleveland Clinic advises contacting a healthcare professional if there is a dark circle or swelling in only one eye, or if the dark circles persist or there is excessive swelling ³.

These signs do not necessarily mean something serious, but they fall outside the common pattern and deserve assessment. Do not try to solve on your own with creams what is one-sided or getting worse.

How long it takes to see a difference

It depends on what you are treating.

So give yourself a realistic timeframe: two to four weeks to assess sleep and sun protection; three to six months for pigmentation. If after that time you see no difference, the problem is probably not one of habits — and at that point a conversation with a dermatologist is the next step, not another cream.

And if the dark circle is purely aesthetic and bothers you, a colour-matched concealer solves in seconds what no treatment solves in months. There is no shame in that.