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Vitamin C Amitose cream turn a little brownish, Stability problem help
Hello, everyone.
I have problem with my vitamin C cream. this year it turned a
little brownish with an acidic smell after a long summer with Covid-19 situation
and had to be kept in the warehouse, consistency is still intact, no aeration seen.
It didn’t happen last year.It is a cream consistency emulsion, in a double-walled
airless pump dispenser to keep it from light and air.LOI:
Water, Cetearyl Alcohol, Pentaerythrityl Distearate, Glycerin,
Polymethysilsesquioxane, Dicaprylyl Carbonate, Saccharide Isomerate, Spent Grain
Wax, Acrylates/c10-30 Alkyl Acrylate Crosspolymer , EDTA, Dimethicone, Argania
Spinosa Kernel Oil, Sodium Stearoyl Glutamate, Caprylyl 2-Glyceryl Ascorbate,
Licorice Extract, Aloe Barbadensis Extract, Phenoxyethanol, Caprylyl Glycol,
Sorbic AcidThis product I don’t know the exact % of the ingredients. Only
details I know are pH 5.5 and Caprylyl 2-Glyceryl Ascorbate is 0.05% because I requested
it to be.It was initially proposed to me as 0.2% of Caprylyl
2-Glyceryl Ascorbate + 3% of Niacinamide but I cut Niacinamide out because I didn’t
want any risk of interaction even if they say it can be used in combination and
dropped Caprylyl 2-Glyceryl Ascorbate from 0.2 to 0.05 to be claim ingredient.1.My primary guess is Vitamin C. the problem might be due to
long storage time in high temperature 40-43 C or more in warehouse.2.pH might not be 5.5 as I reread LOI and didn’t see pH adjusting
agent. Will have to check with the lab.3.preservative problem? Phenoxyethanol, Caprylyl Glycol,
Sorbic Acid? Shouldn’t it be Phenoxyethanol/Caprylyl Glycol/Sorbic Acid?4.or is it have to be used together with Niacinamide? I searched
and found products with Caprylyl 2-Glyceryl Ascorbate. They have Niacinamide. And
they are not in airless pump.1.Deionized Water, Glycerin, Niacinamide, Acetyl
Glucosamine, Butylene Glycol, Aloe Barbadensis
Leaf Juice, Ethoxydiglycol, Phenoxyethanol, Triethylene
Glycol, Imidazolidinyl
Urea, Allantoin, Dipotassium
Glycyrrhizate, Trehalose, Sodium Citrate, Caprylyl
2-Glyceryl Ascorbate, Centella
Asiatica Extract, Sodium
Hyaluronate, Citric Acid, Prunus Yedoensis
Leaf Extract2. DI Water, Butylene Glycol, Glycerin, Niacinamide, Aloe
Barbadensis Leaf Juice, Caprylyl 2-Glyceryl Ascorbate, Methyl Methacrylate/PEG/PPG/PPG-4/3 Methacrylate
crosspolymer, Hyaluronic Acid, Phenoxyethnol, Sodium Polyacryloyldimethyl Taurate,
Hydrogenated Polydecene, Trideceth-10, Cyclopentasiloxane, Dimethicone
Crosspolymer, Phenyl Trimethicone, Dimethiconol, C12-15 Alkyl Benzoate,
Turmeric Root Extract, Disodium EDTA, Lactic Acid, Cl 47005I searched through the forum and found Amitose was mentioned
once by @EVchem and I couldn’t find much through google. I want to gather information as much
as I could before going to discuss with the formulator. my knowledge in cosmetics
chemistry is very basic can only make simple emulsion and anhydrous
gel.Any suggestion is appreciated. Thank you.
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