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11-10-8 is an ionizable cationic lipid (pKa = 6.22) that has been used in the generation of lipid nanoparticles (LNPs) for mRNA delivery in vivo.1 LNPs containing 11-10-8 and encapsulating mRNA encoding the Cas9 nuclease and small-guide RNA (sgRNA) targeting transthyretin (TTR), a thyroid hormone carrier protein, decrease serum levels of TTR in mice. LNPs containing 11-10-8 and encapsulating mRNA encoding human fibroblast growth factor 21 (hFGF21) increase serum levels of hFGF21, decrease body and liver weights, and reduce the liver steatosis score in a mouse model of obesity induced by a high-fat diet.