How to overcome the feeling of skin tightness?

We have recipe of light cream with 17% oil fase (axol c62, tegin m pellets, cetearyl alcohol, vitis vinifera seed oil).
aqua fase:xantahn gum, propanediol, sodium gluconate, water.
Active agents are most of all panthenol (5%).
Preservative: sodium benzoate, potassium sorbate

We noticed, that a lot of people who tested this recipe, said that skin tightness was observed (especially woman 30+).
Some people also noticed a disturbing burning sensation and red spots.
I am asking for advice on what could be the cause of this and how to remedy it.
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Comments

  • AbdullahAbdullah Member
    edited March 23
    Your product may be contaminated with microbes. 

    What is the pH?

    Non of those ingredients cause this at right level. Maybe if you write the percentage of all ingredients help. 
  • MicroformulationMicroformulation Member, Professional Chemist
    Panthenol at 5% is a waste and will have an effect on the stickiness of the final product.

    Again, it is important to know the pH, especially in regard to the organic acid preservative system. A chelant is also needed.
    markfuller@microformulation.com Microformulation.com Microformulation Cosmetic Consulting provides Custom Formulations for both large Commercial accounts as well as smaller entrepreneurs. We can provide Naturally compliant Formulations under the NSF, NPA, Whole Foods and USDA Organic Certifications. BS.Pharm Albany College of Pharmacy, Union University.
  • agaburagabur Member
    pH of cream is 4.9.
    The microbiological test came out correctly.
    Sodium Gluconate as a chelat was used.
  • agaburagabur Member
    I forgot about Isoamyl Laurate (oil fase)
  • I think it's preservative that causes these effects.
  • ozgirlozgirl Member, PCF student
    Some people are sensitive to potassium sorbate. It can cause redness, burning  and flushing reactions.
  • MarkBroussardMarkBroussard Member, Professional Chemist
    @agabur

    The redness, burning is definitely from the Potassium Sorbate.  Some people are also sensitive to Sodium Benzoate.

    Nothing you have listed would generally cause skin tightness, but then perhaps you did not list all of the ingredients.  As noted ... Panthenol at 5% is quite on the high side.
    Chemist/Microbiologist formulating in the Organic & Naturals & Clean Beauty arena under ECOCert/Natural Products Assn/Whole Foods/National Organic Program/Clean At Sephora/Credo Clean guidelines focused skincare & haircare products. 

    See website for details www.desertinbloomcosmeticslab.com
  • agaburagabur Member
    @MarkBroussard ; @ozgirl ; @ggpetrov @Microformulation @Abdullah
    thank you for all the answers. The reaction disappeared after increasing the amount of the oil phase and addition of shea butter. Interesting....
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