HI pegasus2,
I'm thinking about adding SAG to my protocol for a diffuse thinning Androgenetic Alopecia, but my point is about dosage, schedule and, in turn, cost, efficacy, safety.
How did you come to the dosage for SAG of 0.15%, 2 ml per day? Is it coming from your contacts that used it in the past?
In the study on mouse model, they used a really low concentration of 0.6 microg/microL and 25 microL solution in acetone 95% and DMSO 5%, even at single dose ,on an area the looks like 3-5 cm2. Induction ramped up for 5 days and lasted at least further 5 days. The authors commented they think there was a sort of lag for Shh induction due cell activation; SAG didn't go systemic.The same study run a test on excised fetal skin, daily application, % increased up to 0.15 microg/microL, but 8 microL and unknown air exposed area, nor the dosing rationale has been argumented.
But you have reported SAG EC/I50 curve, also with cyclopamine as inhibitor,showing a gauss-like behaviour, with inhibition of the activation at microM concentrations. As speculation for dosage, I have googled for mouse skin thickness and found something like 0.5 mm vs the 2.5-3.5 mm of human scalp skin, so factor 5-6X.
This is my math as backcalculation of the dosage of 0.15%, 2 ml.
They used approx 5 microL/cm2 ,15 microg total dose, so 3 microg/cm2
By assuming factor 5.5 because of human skin thickness, 150 cm2 application area, the dose would be 3X5.5X150=2475 microg, so 2.5 mg or 2 ml at 0.125%.
What is the reason for using it more than once in a 2 weeks Follica-like protocol?