New poster here -- I'm going on six weeks applying first azalaic acid (to boost penetration) cet & water then followed by minoxidil. I'm thinning only in the fontal region at hairline -- I've been working at keeping my hair line for well over 20 years at 49 years now. There is definite growth occurring as I've observed miniaturized hairs lengthening to a degree they hadn't previously -- and I'm acutely observant of my frontal scalp region having paid such close attention on a daily basis for many, many years. I'm too old to waste my time with nonsense. It would be ideal to find a chemist/professional who could optimize a cetirizine formula with the best possible vehicle/solution, whatever that may be. It probably is true that no pharmaceuticals would be interested in pursuing cet as there are many generics available worldwide so there wouldn't be great profit in it. My belief is that if results are being produced at this very low tech approach, there is potential to greatly improve the effectiveness.