Hi all, I’ve recently decided I want to try formulating some of my own personal care items and I’m taking a look at products I currently enjoy to get a baseline. However I also have been doing a lot of reading here on preservation systems, and I’m wondering if two products I use are sufficiently preserved. They are marketed green/natural/etc and I’m starting to get wary of that when it comes to preservation. Without knowing amounts, just the ingredient lists, how do these look?
Face cream by Oneka:
Water (Aqua), Aloe Barbadensis Leaf Juice (Aloe Vera), Calendula Officinalis (Marigold), Polyglyceryl 1-2 Dipolyhydroxystearate, Fucus Vesiculosus (Seaweed Extract), Ricinus Communis (Castor Seed) Oil, Xanthan Gum, Theobroma Cacao (Cocoa) Seed Butter, Rosa Canina Fruit (Rose Hip) Oil, Hypericum Perforatum (St.Johns Wort) Oil, Tocopherol (Vitamin E), Vegetable Glycerine, Panthenol, Hippophae Rhamnoides, (Sea Buckthorn) Oil, Polyaminopropyl Biguanide.
I only see polyaminopropyl biguanide (aka polyhexamethylene biguanide, PHMB). Can this preservative be used effectively as the sole preserving ingredient? Based on my limited reading it seems that it is effective vs gram negative/gram positive bacteria as well as yeast and mold. If that’s true and it doesn’t need other preservatives/boosting ingredients, is there any reason this doesn’t feature on more ingredient lists? I feel like I don’t see it very often. Or, should this product ideally have other ingredients in the preservation system?
And the product I’m most worried about, a body wash by Alevia:
Filtered Water, Coconut Oil, Aloe Vera, Dead Sea salt, Acadian Sea Kelp, Citric Acid, Plant Glycerin
There’s nothing in here that can actually preserve…right? I know salt, acid, and glycerin can have some antimicrobial activity but I highly doubt any of these are in high enough concentration. I quite like this body wash. It purports to be gentle to the skin’s microbiome. I have noticed a decrease in clogged pores on problem areas of my skin since switching to this body wash. I would love to recreate this, but properly preserved.
In reading through this forum, I’ve come across a few preservation systems that have been recommended in an oil in water emulsion (which I think this is?) that also avoid parabens/formaldehyde releasers, which I’d like to avoid. I know it’s impossible to predict based on ingredient list alone, but does the addition of the following seem reasonable?
0.5% phenoxyethanol (appears that 0.5% is recommended here just as well as 1%)
0.05% ethylhexylglycerin (booster, keeping in line with ratio found in Euxyl PE 9010)
Some amount (not sure how much?) of phytic acid (chelant) and sodium benzoate (to help with yeast/mold/fungi)
Any help with assessing the preservation system of either of these products, or feedback on how to make them safer if necessary would be much appreciated!