Protein and moisture have a unique relationship, you can't have one without the other. Too much of one and your hair will become brittle, too much of the other and hair will become very dry. They work together to keep your hair healthy. Hair with the right amount of protein absorbs moisture well because water molecules (a moisturiser) bind easily to the protein structure in the hair.
So how do you know weather your hair needs protein or moisture? - Take a good look at your wet hair, especially when touching or combing.
If your hair...
-Stretches slightly and returns to it's original length without breaking, you are balanced. Stick to maintaining the balance.
-Stretches a little more than normal then breaks, you need more protein in your regimen.
-Keeps stretching with no significant breakage, add a bit more protein to your regimen.
-Feels weak, gummy, mushy or limp, you need to add more protein to your regimen.
-Experiences very little or no stretching, and simply snaps or breaks, you need to add more moisture to your regimen.
If your still not sure, add a little more moisture as too much protein in hair causes it to lack elasticity and will break very easily. Too much moisture in the hair will cause it to feel very elastic or overly soft, when combing it will always stretch lots until it breaks.
By scanning through the ingredients of a hair product you will easily be able to spot whether it contains protein or moisture. A moisturising product shouldn't contain any protein (e.g. hydrolyzed wheat protein or hydrolyzed soy protein) therefor a protein product will contain proteins. To help keep the hair moisturised you need to seal with a small amount of oil afterwards, make sure it is afterwards or you may end up sealing out moisture.
I hope this has been helpful, my information source was this article - ( http://www.associatedcontent.com/article/278612/the_fine_art_of_protein_and_moisture.html?cat=69 )
Take a look for some more information about balancing protein and moisture.
Mayonnaise can applied to hair for protein, Glycerin can be diluted and applied to hair for moisture.