The following criteria to determine plausibility Valotin the quantity and quality of published research how much science backs up each treatment and how good is it these are adjusted by the value of the hair count for example bematapross claims new hairs per centimeter squared this is very modest compared for example to llt's claim of hairs per centimeter squared so it's more plausible even on the basis of weaker evidence the presence or absence of photos studies that report good results.