Why should we have stored some spices and medicines in the dark?

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Why should we have stored some spices and medicines in the dark?

In: Chemistry
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molecules that affect our body are usually very reactive molecule who are on a stable state only thanks to the fact that their “less energic” form requires a tiny push to be reached. That tiny push can come from heat, chemical reaction or light. That’s why some alcohols, medecines and spices have to be kept in a dark and cold environment: so they don’t get pushed to their less energic and unwanted form.

It’s the same reason beer is sold in brown bottles in warmer countries and not green. It protects from damage from solar rays.