Mutational (genetic) robustness is phenotypic constancy in the face of mutational changes to the genome. Robustness is critical to the understanding of evolution because phenotypically expressed genetic variation is the fuel of natural selection. Nonetheless. the evidence for adaptive evolution of mutational robustness in biological populations is controversial. https://megavitamines.shop/product-category/nac-n-acetyl-l-cysteine/