Here's what the research says.

Microplastics have been found in human blood, sperm, and placental tissue. Phthalates — chemicals commonly found in synthetic fabrics like polyester — have been directly linked to lower testosterone levels and reduced fertility in men. A Harvard study of 656 men found that underwear fabric and fit directly impacts sperm concentration and reproductive hormone levels.

Your underwear sits against your most sensitive skin for 16 hours a day. It gets warm. It creates friction. And if it's made from synthetic fibres, it's releasing microplastics and chemicals right where you don't want them.

Nobody is saying your polyester boxers are the reason you feel off. But the research is pointing in one direction — and it's not towards plastic.

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