Can extended breastfeeding be detrimental to a mum's health? Any special supplements to take?

Though most of the people I have spoken to have talked about the advantages of extended breastfeeding there is a particular posthttp://www.livestrong.com/article/1003407-disadvantages-prolonged-breastfeeding/ I read, it says that extended breastfeeding may lead to infertility or even have some menustral cycle related issues

Promo terbesar expert care sudah dimulai, diskon hingga Rp.100.000 sedang berlangsung di shopee, ada juga voucher diskon 100% alias gratis bagi bunda yang beruntung. Buruan cek di https://shope.ee/9UfEMMqqTg (id-213)

thanks