Endothermic atmosphere is prepared by reacting a mixture of hydrocarbon gas, typically methane or. propane and air, metered in a proportion such that there is just enough oxygen to form carbon monoxide. and hydrogen without excess carbon dioxide or water vapor.
But for your everyday run-of-the-mill deep conditioner, it should begin to work instantly, and reach maximum capacity at around the 20 or 30 minute mark. If your deep conditioner doesn't work after 30 minutes, it's time to ditch it for one that's more effective.
Generally speaking, hair regrowth in men is more difficult and takes multiple injections at 6-8 week intervals. It could take 5 or 6 months at least to see appreciable results and sometimes a year. Determining factors are the amount and cause of hair loss, additional treatments for hair and scalp used in combination and the general state of health.