FDA is not so lenient, so they have to abide by their rules. Ultimately, they are the gatekeepers.
However, dosing of chemicals will be the biggest hurdle in terms of TIME;
Suppose you want to test the chemicals are different doses... well, in that case you need to take into account finding patients willing to go in for trials, have the procedure done, then wait for the follicles to develop and then for them to grow. Who knows how long it takes but I wouldn't expect anything less than a full hair growth cycle; 5 months.
So... yeah, the trials probably take a while to complete. Hair grows slow and you need to wait for it grow and go through a cycle before its 100% certain the method works.
However, dosing of chemicals will be the biggest hurdle in terms of TIME;
Suppose you want to test the chemicals are different doses... well, in that case you need to take into account finding patients willing to go in for trials, have the procedure done, then wait for the follicles to develop and then for them to grow. Who knows how long it takes but I wouldn't expect anything less than a full hair growth cycle; 5 months.
So... yeah, the trials probably take a while to complete. Hair grows slow and you need to wait for it grow and go through a cycle before its 100% certain the method works.
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