iamnaked said:
Sorry - that should have been the effects of shampoo on hair, or the effects of not washing ones' hair. Been one of those days. :wink:
Yes, I made a vague reference to such a study earlier in this thread: "Studies on the Effect of Shampoos on Scalp Hair Lipids and Bacteria", Kligman
et al, from the book "Hair Research", Springer-Verlag, 1981. Here are some of the salient things they found, in no particular order:
1) Commercial shampoos all have about the same ability to remove lipids from the hair and scalp, regardless of whether they're supposedly designed for "dry", "normal", or "oily" hair. A shampoo is a shampoo is a shampoo is a shampoo...
2) Shampooing the hair frequently doesn't stimulate the scalp to produce more sebum.
3) It's almost IMPOSSIBLE to completely remove all the oil and sebum from hair, just by shampooing. There's always a residue left over which is virtually beyond the reach of shampoos. To completely remove ALL traces of lipids from the hair and scalp, the researchers had to do as many as literally a HUNDRED washings with ether! :shock:
4) Going for long periods of time without shampooing appears to be safe from a medical point of view, although it's not cosmetically very appealing.
5) Sebum doesn't get "soaked-up" or "wicked-up" by hair. Oil and sebum appears to get onto hair in the first place only by direct physical contact, like when we comb our hair, or touch or scratch our heads, or sleep on a pillow, etc.
Bryan