I've seen few sterile syringe filters of 0.1u, and that size pdvf i've never saw one!
Are you sure it's 0.1 micrometers?
you're in uk right?
please link it here or PM me if you don't mind where you get them since I'm interested on it, specially in europe!
about the retention capabilities, 0.1 is considered macro-molecular range, it's the only one that can barely filter some bigger virus! altough it's far from filtering all virus range and very far from filtering endotoxins. For filtering endotoxins only at 20 au (armstrong units);(20au=0.002 micron) you can effectivelly clean endotoxins and that can only be achieved with specialized equipment!
About of the hormone removal it may be possible, but i'm not sure about this because it will depende on the molecule sizes of it!