Expired tretinoin and clindamycin, should i use it or throw it out?

See below: There has been an (unscientific) study done by hammersmith hospital, london, uk (it carries a prestige like mayo clinic here in the usa). They tested about 20 commonly used (expired) cardiovascular, pain, some antibiotics etc. Products and found them to be nearly fully effective. That study has not been duplicated here. The best advice therefore is throw away those expired items.