Human vs Yarn?

My hair texture is past sholder length and is between a 3b/3c. I work in a scent-free chemical-free environment and was told that I could use braids/twist as protective styling but it must be human hair because it is scent free. If that's the case what kind is recommended? I was also doing some research on yard braids/faux locs/twists and wanted to know if that would be considered scent/chemical-free alternative as well as which brands. I'll take any help I can get lol.

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