To get a deeper tan, don’t sunbathe every day
A master regulator of gene activity sets skin cells to make melanin every 48 hours
![person sunbathing on a beach](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/10/102518_TS_tanning_feat.jpg?fit=860%2C460&ssl=1)
48 HOURS Daily exposure to the sun can hurt sunbather’s chance of developing a dark tan. That’s because skin cells don’t operate on a daily schedule, instead making melanin only every other day, experiments in human cells and mice show.
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