Myths about DHA tanning and tanning accelerators.
What dihydroxyacetone is, how it acts on the skin, the difference between self-tanners and tanning accelerators, and which habits help the result look more even and last longer. No exaggerated promises, just the information you need to choose well.
Translation notice: this is an English translation of our Spanish article, provided for the convenience of international readers. The Spanish version shall prevail in case of any discrepancy. UV safety warnings are based on Spanish regulations (RD 1002/2022) but reflect universal dermatological recommendations.
As temperatures rise, interest in tanning returns. One of the fastest ways to achieve a golden tone is to use self-tanners, lotions that contain specific ingredients to generate colour without sun exposure. The main active in most of these products is dihydroxyacetone (DHA), usually listed on cosmetic labels as derived from sugar cane. In parallel, there are tanning accelerators, a different category designed to enhance the natural tan in a UVA booth or outdoors. Let’s clarify the differences and dispel some common confusions.
How DHA actually works on the skin.
To understand why some myths don’t hold up, it helps to know exactly what DHA does when applied. DHA is a molecule that reacts chemically with the amino acids in the keratin proteins of the stratum corneum, the outermost layer of the skin composed of already-dead cells. This reaction — similar to the Maillard reaction that browns food during cooking — generates dark pigments called melanoidins, which are responsible for the characteristic tanned tone.
The key point about this mechanism: the colour does not come from the body’s melanin, but from a local chemical reaction on the skin’s surface. That’s why the effect fades as stratum corneum cells naturally renew, typically over 5 to 10 days.
Two common myths about DHA.
"Self-tanners stain the skin like paint"
DHA does not behave like a dye or a layer of paint deposited on the skin. What produces the colour is a chemical reaction with the amino acids in the stratum corneum keratin: through oxidation, melanoidins form — dark pigments that remain in those surface cells.
Some lotions, especially those for professional application, do include a guide pigment (a "tint") that helps the technician see where the product has been applied during the session. That auxiliary pigment is water-soluble and disappears with the first shower, while the actual colour generated by DHA lasts for several days.
"You can choose the exact shade of the tan"
Although many brands talk about "shades" (light, medium, dark), the final tone depends mainly on each person’s phototype. What does vary between products is the DHA concentration: the higher the percentage, the more intense the resulting colour, but always within the limits of the user’s skin type.
That’s why the same product can leave a different finish on two different people. Choosing the right product and concentration matters, but the skin determines the final result more than the label on the bottle.
Four points for an even application.
Using a self-tanner is not complicated, but the result depends heavily on the technique. These are the basic guidelines:
Exfoliating beforehand, especially on elbows, knees, heels and knuckles, helps prevent dark patches in areas with drier or thicker skin.
If application isn’t even, neither will the tan be. Work zone by zone and check the edges carefully.
There are gloves designed to spread the product evenly and prevent the palms of the hands from turning brown.
The colour begins to appear 3 to 4 hours after applying the lotion and reaches its maximum intensity the following day. It’s advisable not to shower during those first hours so the reaction can complete.
Tanning accelerators: what they are and what they aren’t.
Self-tanners should not be confused with tanning accelerators. The first generate colour without sun; the second are designed to enhance the natural tan when the skin is exposed to UVA light, either in a booth or outdoors. Within accelerators there are two main families:
Intensifiers
Their main function is to provide the skin with nutrients and hydration that favour a good finish for the natural tan. They don’t add artificial pigments: they work solely on the skin’s condition so that the tan generated by the body’s own melanin looks more even and lasts longer.
Bronzers
In addition to moisturising, they include ingredients that accelerate and prolong the tan, usually DHA, erythrulose or plant-based components such as black walnut hull, carrot oil or caramel. They combine the effect on natural melanin with a colour contribution from chemical reaction or natural pigmentation.
These products can be used both in UVA booth sessions and outdoors. An important point: accelerators do not contain sunscreen, so when used in the sun they must be combined with a sunscreen suitable for the phototype and exposure time. The order of application between sunscreen and accelerator does not affect the tanning result.
Hydration: the factor most often overlooked.
A detail that’s often overlooked: dry skin reflects light irregularly, which translates into a less uniform tan. Keeping the skin well hydrated before, during and after exposure helps the colour look more even and last longer.
The same applies to self-tanners: hydrated, previously exfoliated skin absorbs the product more evenly, which reduces the risk of patches and improves the finish.
Mandatory warning on UV tanning devices. The rays from UV tanning devices can affect the skin and eyes. These effects depend on the nature and intensity of the rays, as well as on the sensitivity of each person’s skin.
About phototype 1. People with phototype 1 — who combine red or very light blond hair with freckles or lack of pigmentation, white skin that has never tanned, and blue eyes — must not use tanning devices or expose themselves to natural sunlight, given the high risk of skin damage.
Note on this content. This article is informational and educational in nature. It does not constitute medical or dermatological advice. For matters of skin health, phototype, allergies to cosmetic ingredients or professional booth protocols, consult a healthcare professional or dermatologist. Sun protection and responsible use of tanning devices are the responsibility of the user and the professional centre.
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