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Glycerin is far more water soluble than some of the other conditioning alcohols such as lauryl alcohol and cetearyl alcohol.
Glycerin is an alcohol, known also by the chemical names glycerol and 1,2,3, propane triol. It can be obtained via hydrolysis of naturally occurring plant or vegetable fats (triglycerides) or via chemical synthesis from petrochemicals. It is a conditioning alcohol similar to other conditioning alcohols, but it has three very hydrophilic hydroxyl (-OH) groups as opposed to a single one.
Synthetic glycerin has received some publicity as being a potential health hazard, and many consumers prefer to avoid it. It is typically produced from the starting material epichlorohydrin, which is a toxic chemical that is classified as a probable carcinogen.
Glycerin can be a great moisturizer and humectant for the hair. Care should be taken to use it in environments of moderate humidity.
Many heat-styling techniques can generate sufficient heat to boil the water inside the hair shaft, which can cause terrible breakage. One way to prevent or minimize this problem is to coat the hair with an emollient that seals in the moisture and that does not transfer the heat from the appliance to the hair as readily. Unfortunately, glycerin conducts thermal energy pretty efficiently (it transfers heat readily to the hair), especially when compared to silicones, proteins, and polyquaternium conditioning ingredients.
MORE INFO: http://www.curlynikki.com/2013/08/is-glycerin-good-or-bad-for-curly-hair.html
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