I'm not an expert on this obviously, since I posted the question. However i would think using it as a leave in would be the problem because more of it stays in your hair.
That makes sense to me, too. I don't know if cleansers and rinse-outs leave behind any glycerin, but the amount left behind probably depends on how much glycerin is in the product. Wen Fig cleanser makes my hair funky during low dew points, and it's loaded with glycerin.
Like Knotty-Maddy and sewt15 said, it all depends on your own hair (and the mood it's in at any given time ). KCKT and KCCC are always the products I can count on during arid weather. I love to try new products and to experiment, but KCKT and KCCC are always, always in my cupboard. When it's not so dry, I really like KCSS (some glycerin) as well, but I have to be careful, because it can knot my ends if my hair is extremely dry.
3b/c, Coarse, Low Porosity, Desert Climate
CG since August 2011/Occasionally Modified since 2013
Favorites: KC Come Clean, As I Am Co-wash,KCKT, KCCC, CJCC, CIAB, Mist-er Right
Glycerin is not good to use in extremely humid or dry weather. Glycerin draws the moisture to what is drier. Since I live in a desert, using products with lots of glycerin makes my hair dry and brittle because the glycerin takes away moisture from the hair and gives it to the drier air. Glycerin itself isn't bad; it depends on the climate and dew point.
This. I use to live in Kansas, which was so SO dry. I couldn't a lot of stuff to deal with the dry air - silicones, glycerin, etc. Now that I'm on the East Coast there is much more moisture in the air here. I've been using glycerin well past my usually cut-off month without any probs.
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4a/b Texlaxed hair w/ highlights. Medium texture & high porosity.
HG's: CJ Daily Fix, Bobeam Cheris Hibiscus shampoo bar, KC Spiral Spritz, Knot Today, CJ Rehab, KBB LL Hair Mask, Cassia, KCCC, oil blend of Avocado, Camellia, Jojoba, & Meadowfoam oils