5% Elastane in underwear - endocrine disruptor or not?

Hey guys,
I’m looking into decreasing my consumption/absorption of plastic.

One of the ways is using only 100% cotton underwear.
If boxer shorts contain 95% cotton and 5% elastane, is it gonna disturb your hormones? I can’t find any information on what elastane really is and how it affects our bodies. I avoid polyester at all cost, of course.
How about bamboo underwear?

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