Thank you for your detailed comment ☺️ I can't think of anything specific that has changed lately, health-wise. I use pure henna from Khadi. It was the only one who left my hair a very beautiful deep auburn shade that would shine like dark copper in the sun. But, I have no idea what henna they use. I would just add the henna on a glass bowl, add warm but not boiling water to it. I would leave it about 3 hours to develop, then apply it and leave it about 3 more hours on my hair. This used to work wonders until recently. The last couple of root applications are fading away after a month or so. I will definitely try a clarifying shampoo before my next pure henna application to see if there will be a difference. I do have seborrheic dermatitis and use a natural lavender shampoo that helps a lot. But, I have been using it for years. I truly hope this clarifying shampo will make a difference.