Medroxyprogesterone acetate has been known to cause mood disturbances in some, sometimes quite severe, to the point of being very depressed and suicidal. It is also mildly androgenic (binds to androgenic receptors) but whether that effect is cancelled out by its reduction of testosterone may depend on the individual. Several studies have noted this progestin's negative effects on the vascular system and its tendency to reverse estrogen's positive effects on lipids (i.e. HDL). Some studies, among them, the very famous WHI (Women's Health Initiative, 2003), found an increase in breast cancer risk, in cardiovascular complications and even clotting incidences in those women taking medroxyprogesterone acetate versus those who weren't. For all these reasons, I wouldn't personally ever take it. I take Prometrium (bio-identical progesterone) instead. It can actually have a mood enhancing effect in some due to allopregnanolone, has not been associated with cardiovascular complications (can actually decrease blood pressure) nor with an increase in breast cancer risk. It is also not androgenic and has been shown NOT to elevate androgen levels. Of course, certain side-effects may still occur with it although the most common ones are quite mild like drowsiness, nausea, headaches, etc and severe side-effects seem quite rare. Progesterone has helped some transwomen with dry skin/hair and brittle nails. Also, with libido.
Bio-identical progesterone is quickly metabolized in the body (because it's bio-identical) compared to medroxyprogesterone acetate. Studies have shown levels of progesterone to fluctuate quite a bit within hours so that taking it twice or even thrice daily may sometimes help some get steadier levels.
Estrogen alone has shown in ciswomen and transwomen, in sufficiently high doses, not only to prevent bone loss but promote/increase bone mineral density, hence preventing brittle bones or osteoporosis.
I'm not an expert and I share this information just as knowledge that may be useful to you, for discussion with your health professionals.