Great for psoriasis [SEP] I buy everything I review. To receive FIVE stars, a product must meet &#62;90% of the manufacturer's claims. I don’t subtract because I don’ t like the color or appearance (too subjective and personal). I review form, function, ease of use, and construction quality. Please forgive typos: I’m an evidence-based scientist, NOT a typist. If you find my review helpful, please click &#34;YES&#34;. This helps me improve future evaluations (which I do for free to help people make more informed decisions).<br /><br />Their Claim:  Controls the itch of psoriasis<br /><br />My Verdict (details below):  True for most people<br /><br />As a physician, I know how itchy this condition can be on your scalp. I recommend coal tar shampoo to all my patients. Most dandruff shampoos use salicylic acid (which is aspirin) for the itching, which is NOT very good at stopping the itch. My wife has tried that with NO success. Coal tar is much better at controlling it and is the active ingredient in most topical creams for psoriasis of the skin. It's available in higher strengths by prescription, but this product at 2.5% is sufficient for most scalps.<br /><br />Just use it 3x/week for adequate control. Let it sit in the scalp for five minutes, which means apply immediately upon entering the shower, then do your stuff. Just before exiting, wash it out. It's okay to leave some in the scalp; it won't hurt you. You may wish to use shampoo after, but this has shampoo/conditioner in it and in my experience, using other hair products is counterproductive.<br /><br />This tingles, so you know it's working. The only problem? It's nearly impossible to find in stores, and is often sold out at Amazon. Other companies make similar products. Just type COAL TAR SHAMPOO in the search bar to find others. They all have 2.5-3% coal tar. You need a script for 5% for some idiotic reason. What, you're going to get addicted to the stuff and overdose? The FDA is a real killer sometimes.<br /><br />If you itch, here's the product for you if you can find it. Denorex does a lousy job of marketing this product.