Propylene glycol

I notice this is in a lot of products. What is it and is it harmful or safe? I was going to buy the new Deva conditioner and I noticed that it had this ingredient...opinions?
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Sent from my SPH-L710 using CurlTalk App
Last Relaxer: 2/11/2012
Latest BC: 11/24/2018
The Truth About Propylene Glycol, According to a Chemist
3a, some 2c & 3b, medium texture, porosity normal, low elasticity :-(
washing/cowashing, conditioning, protein tx: curl junkie products
leave in:curl junkie conditioners and treatments as leave in
styling: curl junkie
sealants - jane carter nourish & shine
RO: IN Harmonic
LI: CJ Beauticurls; Jessicurl (JC) Gelebration Spray
DC: JC Deep Conditioning Treatment; Weleda Rosemary Conditioning Oil
Stylers: JC Confident Coils; IN Volumizing Spray; IN Perfect Hold Hairspray; John Masters Sea Mist; Bumble Bb. Gel; Kenra Firm-Hold Gel; Sevi Blue Yarrow Sea Salt Spray
Low-porosity 2a/b baby-fine hair