I have bought this before I am naturally grey and never had as many compliments about my hair since I used Olaplex I’m very happy 

I have white/silver grey hair. It’s an excellent shampoo but, leave it on too long, or use it too often and I have lilac purple hair!. The reason for 4* rating  I love it but can’t use it too often as I don’t want purple hair, so I’ll have to buy the non-purple shampoo for the times I don’t use it.

I absolutely love what this did to my actual hair the day I washed it but oh my goodness the scalp irritation I experienced is dreadful and takes over 2 weeks to heal. Crawling itching, then sore raised spots on my scalp and back of neck where my hair touches. I’ be tried it twice and can’t risk it again. My scalp is pretty good normally

I love this product it keeps my blonde hair so bright and clean between colours. It's the best purple shampoo ever

This really does tone any brassy tones down in bleached blonde hair but i agree with other reviewers who said it doesn't lather much and doesn't seem to add much to the hair other than to act as a toner. I wouldn't use for every shampoo but maybe 1 in every 3? Although it is olaplex I am unsure of what is particularly special about it in relation to the olaplex system but in general I do rate olaplex products and there is no doubt that this does get rid of any brassiness.

I wasn’t sure about this product at first due to the price point and trying olaplex for the first time but this is hands down the best shampoo I have ever used.  My hair feels and looks amazing after every wash!

I've have highlighted hair and have tried quite a few blonde toning shampoo's. This is the best by far even my hair dressers asked what I had used of my highlighted hair as they wasn't a trace of brassiness and I last had hair lighten 5 months ago. Highly recommend

I only used this shampoo once and it stained my hair horribly. It gave it a green-ish tone and purple stains. It does stain your hands easily so make sure to wash them properly. Unfortunately after only one use, I have disposed of it in the rubbish and won’t buying it again. Just not for me..

I do love this but, if you don’t rinse throughly you will look like you have purple hair, and it stains your hands. Does maintain your colour though 

I think is a lovely product and make the hair with beautiful tone. Just i notice if i use to often make little dry ends.but i am not so sure if is the shampoo or just my hair is colour and dry on the end. I recommend for sure