Alternating hair products

Anyone else alternate hair products?

I was recently given a really thick, oily serum to use on my hair at night to encourage a faster hair growth rate (I don't really believe in that kind of thing but it was given to me so why not use it).

However, a few days before I was given this I started using another product I have previously used (that actually worked). The only problem with this product is that while it encouraged new hair growth (which is my actual problem), it leaves my hair feeling dry and brittle so it breaks easier.

I figured if I alternate using the two daily (oily one night, dry the next), it would be a sort of happy medium and my hair might get the best of both worlds.

Does anyone else do this, or should I stick to one or the other (the thick one would require me to wash my hair daily, the dry one would require additional conditioner daily and then in turn, require me to wash my hair a bit more too).