Subgroup analysesSubgroup analyses by dose of BHT suggested that higher doses of BHT may be associated with more effectiveness but also higher risk of adverse effects .
There was low to moderate quality evidence that BHT in various forms and doses is more effective than placebo for treating moderate to severe menopausal hot flushes .
There was some evidence to suggest that higher doses of BHT are associated with greater effectiveness but also with higher risk of adverse effects .
No data are yet available about the safety of BHT with regard to long-term outcomes such as heart attack , stroke and breast cancer .
BACKGROUND Various hormone therapies ( HT ) are available to treat  menopausal vasomotor symptoms .
Bioidentical hormones are chemically identical to those produced by the human body , and several types are well-tested and available on prescription .
Many women have opted for bioidentical hormone therapy ( BHT ) on the assumption that it is safer than other forms of HT .
We evaluated the evidence .
OBJECTIVES To determine the effectiveness and safety of bioidentical hormones compared to placebo or non-bioidentical hormones for the relief of vasomotor symptoms .
Effects of ultralow-dose transdermal estradiol on postmenopausal symptoms in women aged 60 to 80 years
Objective : To investigate the effect of ultralow-dose transdermal estradiol on postmenopausal symptoms and side effects in a cohort of largely asymptomatic postmenopausal women aged 60 to 80 years . Design : This secondary analysis used data from the UltraLow-dose Transdermal estRogen Assessment trial , a r and omized , placebo-controlled , double-blind trial in postmenopausal women to determine the skeletal effects and safety of ultralow-dose transdermal estradiol .  Four hundred seventeen postmenopausal women , aged 60 to 80 years , were r and omly assigned to receive either unopposed transdermal estradiol at 0.014 mg/d ( n = 208 ) or placebo ( n = 209 ) . Participants were queried at each clinic visit about postmenopausal symptoms and side effects purported to be associated with estrogen therapy using a st and ardized question naire . Results : At baseline , 16 % of women reported hot flashes , 32 % reported vaginal dryness , and 35 % reported trouble sleeping . Women who received ultralow-dose estradiol were no more likely to report improvement of hot flashes , vaginal dryness , or sleep difficulties than those who received placebo . Treatment with ultralow-dose estradiol did not cause breast tenderness , uterine bleeding , or other symptoms often attributed to estrogen , but vaginal discharge was more common in women who received estradiol compared with those who received placebo . Conclusion : In this population of older , largely asymptomatic women , ultralow-dose transdermal estradiol did not improve postmenopausal symptoms and did not cause side effects other than vaginal discharge . Further study is needed to determine whether this dose of transdermal estradiol is effective in treating symptoms of postmenopause in younger , more symptomatic women
Subgroup analysesSubgroup analyses by dose of BHT suggested that higher doses of BHT may be associated with more effectiveness but also higher risk of adverse effects .
There was low to moderate quality evidence that BHT in various forms and doses is more effective than placebo for treating moderate to severe menopausal hot flushes .
There was some evidence to suggest that higher doses of BHT are associated with greater effectiveness but also with higher risk of adverse effects .
No data are yet available about the safety of BHT with regard to long-term outcomes such as heart attack , stroke and breast cancer .
BACKGROUND Various hormone therapies ( HT ) are available to treat  menopausal vasomotor symptoms .
Bioidentical hormones are chemically identical to those produced by the human body , and several types are well-tested and available on prescription .
Many women have opted for bioidentical hormone therapy ( BHT ) on the assumption that it is safer than other forms of HT .
We evaluated the evidence .
OBJECTIVES To determine the effectiveness and safety of bioidentical hormones compared to placebo or non-bioidentical hormones for the relief of vasomotor symptoms .