Is glycerine safe to use on hair?

I understand glycerine is safe to use on the skin but I’m concern whether it would clog the scalp pores. I’m trying to make my own shampoo and I’m not quite sure if I should add glycerine? I would appreciate some insight on this please, thank you :)
Is glycerine safe to use on hair?
Is glycerine safe to use on hair?
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