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The reason why self-tanning products have a short duration is because most self-tanning products contain the active ingredient DHA (dihydroxyacetone), which creates a natural sun glow by chemically reacting with the amino acids in the dead layer (the stratum corneum) of the skin's epidermis. This means that the duration of the sunless tan is short because the stratum corneum is coincidently shedding meaning the tan cannot last more than 28 days (for young people). This is also the reason why it can become patchy as we are always shedding skin (Desquamation).

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Savannah Rothwell

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Q: Self-tanning treatments have a limited duration?
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