Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Biodistribution & persistence
No distribution, milk or placental transfer studies conducted
“No studies of distribution, of excretion in milk and placental transfer with levacetylleucine have been carried out, as levacetylleucine is metabolized by deacetylation (a robust and ubiquitous mechanism), giving rise to a single metabolite, L-leucine, which is endogenously present in humans.”
“Embryofetal development toxicity, including malformations and embryofetal death, was observed based on dose-ranging embryofetal developmental toxicology studies that were conducted in rats and rabbits at 1.4- and 6-fold the MRHD based on body surface area.”