Formulated for blonde, lightened, highlighted, or gray hair — especially hair that's also chemically processed and damaged from lightening services — that needs both brassiness control and strength repair in one shampoo. It's a toning shampoo, not an everyday all-purpose cleanser, so it fits people already using purple/toning products in rotation with a regular shampoo, and it's suitable for any gender or hair length within that blonde/lightened category.

Most purple shampoos only address tone and can leave chemically lightened hair feeling stripped, since the same lightening process that creates the brassiness this shampoo corrects is also what damages the hair in the first place. Pairing the violet toning pigment with Keravis protein and the Asta-Repair antioxidant complex means the shampoo works on both problems in the same wash instead of requiring a separate strengthening product for lightened hair.

Pureology recommends using Strength Cure Blonde one to three times a week, or roughly every third wash, adjusting frequency based on hair porosity and how much brassiness has developed — more porous or brassier hair can handle more frequent use, while less brassy hair should use it less often to avoid over-toning. Apply to wet hair, work into a lather, and rinse. Because it's a toning shampoo, avoid leaving it on for extended periods beyond a normal wash, since that increases the risk of an over-toned, ashy or lavender cast, particularly on very light blonde.

Pros:

• Violet pigment directly targets brassy yellow/orange tones rather than just cleansing
• Keravis protein + Astaxanthin give a strengthening function most toning shampoos skip
• Sulfate-free cleansing is gentler on color and less likely to strip toning pigment too fast

Cons:

• Overuse or leaving on too long can over-tone hair with a lavender/gray cast, especially on very light blonde
• It's a toning formula, not a daily shampoo — extra routine management needed
• Contains added fragrance (Parfum) — a consideration for fragrance-sensitive users