Natural IVF involves egg collection aligned with a woman's natural menstrual cycle; there are fewer or no fertility drugs/injections. It aims to collect the one egg that has been naturally selected and matured by the body, and the fertilised egg/embryo is placed back into the lining of the womb.
Natural IVF is therefore the closest that IVF treatment can get to natural fertilisation. It focuses on the quality of eggs, not the quantity. Natural IVF is a delicate and precise treatment. For the best chance of success, the clinic must be 100% dedicated to this type of approach.