Based on three decades of citation data from across scientific fields of science. we study trends in impact factor biased self-citations of scholarly journals. using a purpose-built and easy to use citation based measure. Our measure is given by the ratio between i) the relative share of journal self-citations to papers published in the last two years. https://www.parisnaturalfoodes.shop/product-category/org-vit-d3-spray-vanilla/