The product description places this shampoo as a deeper reset for the scalp, not an everyday cleanser. It is intended for use a few times a week rather than with each wash, because it combines several more active components: selenium disulfide, salicylic acid and SENSOCEL cellulose particles.
A reasonable starting point is two applications per week if your roots become oily quickly. If your scalp is only mildly oily and you mainly want to remove styling residue or heavy flakes, once every five to seven days can be enough. On other wash days, a gentle shampoo tailored to your usual scalp condition is a sensible alternative.
Because the formula is more active than a standard shampoo, begin with one application. Observe how the scalp feels for the next day or two, then increase the frequency only if needed. If your skin is very reactive, or if you know you are sensitive to preservatives such as MIT/CMIT, introduce it cautiously and stop if irritation appears. Do not use it at the same time as other strong scalp exfoliants. If you are pregnant, breastfeeding, currently treating a scalp condition or taking medication, consult a specialist before adding this product to your routine.
The correct frequency depends on your own scalp response rather than on a fixed rule. If the scalp starts feeling tight, tender or too dry, reduce the number of applications and give the skin a rest.