My Olaplex journey has been for 1.5 years by now, and its the first time I ordered a big size instead of regular 100 ml. Due to the Cult Beauty discount it was a very good deal. I've highlighted shoulder length hair that I blow dry almost daily and after adding Olaplex 3 that I use with Olaplex 0 primer under as a weekly mask (1-2 h), my hair breakage has decreased a lot. Every time I miss my weekly treatment, I see how much more hair breaks with combing/brushing. It doesn't add much volume/smoothness, but my hair looks stronger and the ends are healthier, so I notice a marked difference when not using it. Since then I've added also Olaplex 6 leave-in into my daily routine and this system works great. Whilst a small bottle lasts about 5-6 weeks, this one is a great investment for longer.

Definitely strengthens hair strands, but caused significant hair fall - coming out in  clumps for days following use. Avoid.

I used to have damaged hair from all the heat and straightening treatments . I used olaplex No 3 and after a while it really made a difference. My hair is softer now and healthier .

Use it with #6, #0 and 7 + with matching shampoos and conditioners and hair looks like after salon + feels more prone to breaking I think it's my 3rd bottle- holy grail

I love all olaplex products. Theeee best NO.3