My first reaction to this article from MedLinePlus.com was "well, duh!" (cold weather makes me snarky.) It's long been known that transdermal (through the skin) application of hormones decreases the risk of blood clots, but ok, now we have an "official" study to back it up.
However, this is a prime example of misinformation: paragraph 3 of the article says "The number of women using HRT plummeted in 2002 after a large U.S. clinical trial found that women on estrogen-plus-progesterone pills had higher risks of blood clots, heart attack, stroke and breast cancer than placebo users did. " The WHI (2002) study referenced used PROGESTIN, not progesterone, and there is a huge difference. Progestin is not bioidentical, progesterone is bioidentical. Always take these articles with a grain of salt----they often contain erroneous information!