Hair lotion preservative/emulsifier problems
Hi to everyone. First to say, this forum is realy great discovery for me! Lot of helpfull advices for formulators.
I am trying to formulate hair growth and antidandruff, leave on, hair lotion (so far had about 30 test with different ingredients and concentrations).
Urticae folii tincture (55% ethanol)
Rosemary essential oil
Myrtus communis essential oil
Tea tree essential oil
Lavender essential oil
C02 rosemary extract
Tetrasodium glutamate diacetate
I have several issues:
1. I wanted to use Geogard ultra as persevative but as I red, several people in disscusion here on forum claim it is not strong enough. Than I changed to Geoguard 211, but many traders mention that it is incopatibile with nonionic surfactants (I have polysorbat 80 as emulgator). What is your experience with this combination? Do you advice me to use this two substances in same product?
Lonza has studies where they use Polysorbate 80 (0,5% conc) with Geoguard 211 in hair conditioner, and it is fine with them.
2. I am using Dynamix mixer for emuslification, polysorbate 80 as u/v emulsifier and span 80 (antifoaming agent) but my emulsion is not stable for long time. I will put instruction “shake well before use” but could you suggest me something to improve here?
Essential oils are 12% of the all ingredients.
3. Looking on the ingredient table, do you have any other advice what can I improve?
Thank you very much!
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