Preservative: Dehydroacetic Acid + Glycerin; Aqua; Sodium Levulinate; Sodium Anisate

Hi, 
I was asked to prepare a face cream with electrolytes and niacinamide. I already have a formula in mind, but before ordering the ingredients I'd love to know your opinion on the following:

1. Will : Dehydroacetic Acid (0.6%) +Dermofost 1388 eco 3,5% (Glycerin; Aqua; Sodium Levulinate; Sodium Anisate) + chelator Sodium Phytate 0.1% be sufficient to preserve a cream at pH 5.45?

2. Do you know where can I buy pure Dehydroacetic Acid in small quantities?

3  Will Montanov 68 (Cetearyl Alcohol & Cetearyl Glucoside) + Cetyl Alcohol + sclerotium gum work well with Sodium PCA and Calcium PCA?


The other ingredients in the formula include:
- apricot karnel oil, shea butter, meadowfoam oil, borage oil,  lactic acid, feluric acid, propanediol, squalane, turmeric CO2, hyaluronic acid, sodium lactate, tocopherol, papain, essential oils, water. 

4. In case I can't find pure dehydroacetic acid, will AMTicide coconut (Lactobacillus, Cocos Nucifera (Coconut) Fruit Extract) work instead of it? I know AMTicide coconut is cationic so I have some doubts it will be ok for my formula. 


Thanks guys! :)
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