A daily leave-in conditioner can help combat the dryness, but occasionally, hair will still feel a bit brittle/dry....a serum can definitely help. Some are not as good as others though and people report different results [even non-wearers] from what I read. I applied some a few days ago to both systems, and the hair is definitely feeling softer than it was.....it`s most likely the silicone, which also gives a nice level of natural-looking shine. Again, as with most products/treatments with systems, I reckon a little is better than too much.....as with shampooing, you can literally kill your system with kindness !