A four-carbon ketose sugar found in small amounts in plants and fruits, also used in sunless tanning products.
From Greek 'erythros' (red) + '-ulose' (ketose sugar suffix). Named for its classification as a rare ketose sugar.
If you've ever used spray tan or self-tanning lotion, you've likely applied erythrulose—it reacts with proteins in your skin to create a fake tan, and it actually works safer than dihydroxyacetone because it's gentler on skin.
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