Verdict
Olaplex No. 4P Blonde Enhancer Purple Toning Shampoo may be a cost-effective choice for reducing brassiness in blonde hair, but it requires careful use to avoid turning hair an unintended purple hue, especially for gray hair. Results can be inconsistent with concerns about product authenticity and quality compared to other Olaplex products. If you're seeking a milder toning effect or own gray hair, consider testing this product before important occasions.
- Top pro:
- Slightly cheaper than most retail stores.
- Top con:
- Does not effectively reduce brassiness in hair as claimed for all users.
Pros
- •Slightly cheaper than most retail stores.
- •The product can effectively eliminate brassy undertones in blonde hair.
- •Suitable for blond or dyed hair when used cautiously.
- •Users report the product effectively toning down brassiness, initially.
Cons
- •Does not effectively reduce brassiness in hair as claimed for all users.
- •Users experienced no noticeable results after multiple uses.
- •Authenticity of the product raises concerns.
- •Can turn gray hairs purple; especially problematic even with reduced usage.
- •Users report hair turning purple even if applied for a short time.
- •Results can appear more vibrant or intense than desired.
- •Quality not on par with other Olaplex products; leaves hair stiff and tangled.
- •Runny consistency and minimal conditioning effect.
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How we researched this
About this review: it summarizes the professional reviews and customer ratings ShopSavvy collected for this product, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Jun 16, 2026.
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