By cozylivingde 
If you’ve dealt with scalp psoriasis or seborrheic dermatitis for any length of time, you know the cycle: flaking, itching, redness, then more flaking. Over-the-counter shampoos often promise relief but deliver only temporary cosmetic fixes. Tarsum Extra Strength Psoriasis Shampoo takes a different approach, using coal tar as its active ingredient—a treatment that has been around for decades but still divides users. I spent several weeks testing this 4-ounce bottle to see how it performs in real-world conditions, not just on a label.
The key functional feature here is 2% coal tar, which works by slowing down the rapid turnover of skin cells that causes scaling in conditions like psoriasis and seborrheic dermatitis. It also has some anti-inflammatory and anti-itch properties. Unlike many dandruff shampoos that rely on zinc pyrithione or selenium sulfide, coal tar offers a heavier-duty option for more stubborn cases. Tarsum markets this as an extra-strength formula, and it delivers on that promise—but not without trade-offs.
In practice, the shampoo has a distinct, medicinal smell. It’s not pleasant, but it’s not as overpowering as some coal tar products I’ve tried. The texture is a dark brown liquid that lathers moderately. You need to leave it on the scalp for a few minutes to let the tar work, which is standard for this type of treatment. After rinsing, my scalp felt noticeably less itchy, and the flaking reduced over the course of about a week of every-other-day use. However, the relief is not instant, and some users may need to stick with it for two to three weeks to see significant improvement. It also tends to dry out the hair if used too frequently, so pairing it with a good conditioner—or the included conditioner in the Tarsum kit—is necessary for most hair types.
One limitation is the bottle size. At 4 ounces, it’s small compared to standard shampoo bottles, and because you need to use a generous amount to cover the scalp, it doesn’t last long with regular use. The price point is higher per ounce than many drugstore alternatives, which might be a concern for long-term management. Additionally, coal tar can stain light-colored towels and pillowcases, so you’ll want to rinse thoroughly and maybe use a dark towel.
Comparing Tarsum to a generic coal tar shampoo like Neutrogena T/Gel, the Tarsum formula feels slightly thicker and seems to require less product to achieve coverage. The T/Gel has a more watery consistency and a stronger tar odor, while Tarsum is a bit more refined in texture and smell. That said, T/Gel is usually cheaper and more widely available, so if cost is a major factor, it’s a reasonable alternative. Another option would be a salicylic acid-based shampoo, which exfoliates scales differently but may be less effective on severe inflammation.
This product is best suited for people with moderate to severe scalp psoriasis, seborrheic dermatitis, or stubborn dandruff that hasn’t responded to milder shampoos. It’s also helpful for those with eczema on the scalp, though results vary. It is not ideal for people with very sensitive skin, as coal tar can cause irritation or a mild burning sensation in some users. Those with dry or color-treated hair should also be cautious, as the shampoo can strip moisture and color over time. Pregnant or nursing women should consult a doctor before using any coal tar product.
Overall, Tarsum Extra Strength Psoriasis Shampoo is a functional treatment that works as advertised, but it’s not a miracle cure. It requires consistent use, patience, and some lifestyle adjustments to manage the odor and potential staining. If your scalp issues are chronic and you’ve tried gentler options without success, this is worth considering. Just don’t expect it to disappear overnight—and be prepared for the smell.