According to an older 2013 review of research, they may have lipotropic effects in rodents: Very limited research exists on the efficacy, safety, and lipotropic properties of the ingredients used in these injections for weight loss
Reviewers like that it absorbs quickly and doesnt leave a sticky finish on their skin
But here is what the ads dont tell you: smaller doses havent been studied extensively in large clinical trials, there is no evidence that microdosing is safe and effective, and microdosing comes with real safety risks, including dosing errors
doi:10.1016/j.metop.2024.100329 Osborn L, DuPuis K, Liu S, Della Corte D, Della Corte KA
At the same time, L-theanine could also upregulate a bunch of the rhythm genes and differential expression genes involved in vasoconstriction and actin cytoskeleton regulation pathways