Warming, Burning or Tingling Sensation

I've been working on some formulas for a work project and about 1/3rd of our focus group is experiencing what they describe as a 'warming', 'tingling' or 'burning' sensation when applying the product. No redness occurs and the sensation disappears within at least 1 minute. 

I've noticed that samples without the preservative Phenoxyethanol + Caprylyl Glycol do not have this same warming sensation... Has anyone come across a similar situation with Phenoxyethanol? In the products its in at upwards of 0.85% concentration w/w. I'm having difficulty with my research on Phenoxyethanol causing such a sensation as it has a lot of mixed media regarding its use.


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