Concentré de Collagène Serum Available for Home Use- " Plumps " Hair 5 East 57th Street, NYC Living in NYC, we knew a lot of people that work on their heads, literally and figuratively . And we were thinking about that as we received an absolutely transporting, in a good way, scalp treatment/massage ($45) at the busy- but refreshingly calm- Roy Teeluck 's midtown salon (our opening review) . Not that we needed a bribe exactly, ha ha...but when we received the press release on Concentré de Collagène, a serum that comes in a bottle with an eye dropper mechanism...that easily enough, with a few drops on fingers/palm-is massaged and quickly absorbed into one's scalp, recommended about 5x a week...after towel drying one's washed locks. Intrigue struck...because yes, as firm believers in the maxim "...you are what you eat..." (as in the cult fav hair builder Viviscal - our review ) and also knowing that about ( at least ) 80% of anything applied ...