A central goal of chemical and drug delivery sciences is to maximize the therapeutic efficacy of a given drug at the lowest possible dose. Here, we report a generalizable strategy that can be utilized to improve the delivery of mRNA drugs using lipid nanoparticles (LNPs), the clinically approved chemistry platforms utilized in the Moderna and Pfizer/BioNTech COVID-19 vaccines. In brief, our strategy updates the chemistry of LNPs to incorporate adenosine triphosphate (ATP) alongside mRNA, a modification that results in upward of a 79-fold increase in LNP-delivered mRNA-encoded protein expression in vitro and a 24-fold increase in vivo when compared to parent mRNA LNP formulations that do not contain ATP. Notably, we find that our ATP co-delivery strategy increases LNP-delivered mRNA-encoded protein expression across eight different LNP chemistries and three different cell lines, under normoxia and hypoxia, and in a well-tolerated fashion. Notably, our strategy also improves the expression of mRNA encoding for intracellular and secreted proteins both in vitro and in vivo, highlighting the utility of leveraging ATP co-delivery within mRNA LNPs as a means to increase protein expression. In developing this strategy, we hope that we have provided a simple yet powerful approach to improving mRNA LNPs that may one day be useful in developing therapies for human disease.