A workout that used to take a day to recover from starts taking three. The usual response is to train harder or add another supplement, when the more useful question is what changed underneath.
Recovery is a physiological process
Rebuilding after training depends on sleep quality, hormone levels, inflammatory load, and having the raw materials available. When one of those is off, effort alone does not compensate.
Sleep is usually worth checking first
Hours in bed and quality of sleep are different things. Someone can spend eight hours asleep and still wake unrested, and that gap affects hormone production and recovery capacity directly.
Finding the limiting factor
Reviewing training load and sleep history alongside lab work tends to narrow things quickly. The goal is to identify what is actually limiting recovery rather than adding more to a routine that is already full.