RecruitingPhase 1Drug trialA First in Human Study of the Safety, Tolerability, and the Physiologically Based Pharmacokinetics of XFB19 in Healthy Adult Volunteers.Xfibra, Inc. is conducting a Phase 1, randomized, double-blind, placebo-controlled, first-in-human study of the safety, tolerability, and physiologically-based pharmacokinetics (PK) of single and multiple ascending doses of XFB19 in healthy adult volunteers.