With the help of Khadija at hennasooq.com in Ontario, a few of us are trying to figure out why some hennas do not work on HFS and some do. Khadija is also recommending that we try leaving the lemon out of the formula - it's too drying. I'll try that this chemo cycle. If you have any experience, please let me know. In the meantime, I use Jamila henna, 2008 harvest. My HFS is now less than Grade 1 and I was well into Grade 3.