injections versus gels

Has anyone noticed a lag when switching from injections to gel? After a several days on the gel, I feel like I have quit taking testosterone all together. Does anyone know if there is a time period where the body has to adjust to the new way or form of processing the testosterone?

J Cachexia Sarcopenia Muscle. 2018 Mar 15. doi: 10.1002/jcsm.12291. [Epub ahead of print] Muscular responses to testosterone replacement vary by administration route: a systematic review and meta-analysis. Skinner JW Abstract BACKGROUND: Inconsistent fat-free mass (FFM) and muscle strength...