Talking about the use of chemicals in sun creams that absorb the sun's damaging UVA and UVB rays, the super is reported to have said: "I cannot put this poison on my skin. I do not use anything synthetic."
The world's highest-paid model may have been seen in a TV commercial spreading sun lotion on her body, but her latest remarks have got skin cancer experts in a tizz. Even Brazilian dermatologists have rounded against her, claiming her words were regrettable and could cause confusion.
It's not the first time Gisele has been in trouble for expressing her views. Last year she caused controversy by claiming all new mothers should have to breastfeed their babies for the first six months and not use formula milk. Though in fairness, she did apologise for her comments later.
So how does Ms Bundchen protect herself from the damaging effects of the sun's rays, we wonder? According to newspaper reports, she only usually exposes her skin to the sun before 8am.
Given that the model is often snapped wearing a teeny bikini - and we now know that she doesn't use sun screen - what do you think Gisele does during the rest of the day to protect herself against sunburn? Any ideas?