I've only used this in combination with No 3, and I am happy with the results. My damaged dry hair (from bleaching and colouring my hair for some time) felt softer and was more manageable when I used this combination on my hair. The only con was that the package of No 3 isn't very handy when you need to get it to the ends. You end up wasting a lot of the product and I immediately thought a spray would've been better. Thankfully and maybe unfortunately, the brand did come out with a spray bottle shortly after my purchase.

This really makes a difference when used in combination with no 3 vs only using no 3

I have mixed feelings as to whether this product is worth the money and completely necessary. All in all I can say I guess it works quite well in combination with the other Olaplex treatments.

no 0 increases the effects of no 3 three visibly and gives better results than when using no 3 alone

This stuff is amazing. My hair gets nourished and silky soft after each treatment. Feels much stronger too. This is a must have.