trying.... and it depends upon what stimulant you are using but if you are using an FSH only stim such as gonal-F or Follistim you may also consider supplementing it with 75IU of LH. See my post on LH above... but in addition LH has also been shown to have a beneficial effect in E2 production and therefore, in increasing the lining thickness. IF this does not seem to help then you may want to try supplementing with E2 .. although there are mixed reviews about E2 being effective in increasing lining. Another thought... and I know Dr. Sher tried this on 4 women with good results... BUT CAUTION...a sample size of 4 is very small and can't result in any cause/effect... you need to repeat this on many women and see if there is a difference... but he used Viagra and found an increase in endometrium. So... those are my thoughts on this..... let me know what your doctor says about trying any of these options.