If you are speaking Czech language and are interested in reviews available for health product in CZ it is best to check out this site.

Altenative site in CZ langauge is kosmeticke-poradenstvi.com

For resources in Slovakian language zdravie-krasa.com or prirodne-triky-sk.com

Besides those there are decent site with product reviews in Hungarian - velemenyekar.com and this one in magyar