[eisen]

@David 
Does this mean that because the bacteria survive in Chrisal soap because there is no preservative? If I compare the ingredients of Lactacyd and Chrisal, if one gets rid of preservatives one could just add the yogurt bacteria? 

This probiotic / prebiotic stuff realy interests me. It is a step further from just making an emulsion? Imagine the Chrisal variant for intimal care .

[eisen]

In Belgium there are number of producers with live bacteria in the skin or surface care and cosmetics. I know of Chrisal who does everything from the industrial spray cleaners to feminine hygiene.

As far as I understand the big problem is the bactericidal action of surfactants. Sodium lauryl and laureth sulphate kill the bacteria. Unless you have a solution, you need a surfactant to suspend the bacteria. And you need a lot of it. I have read that glycereth is milder, i guess you should just use the glycereth and be fine. The Chrisal is extremely thick but almost not oily - I would guess 10 to 15 weight % of surfactant and ten times less of bacteria.
Bacteria is probably better than the typical vaginal soap - Lactacyd ( as the name says) is based on lactic acid. Imagine the lactic acid bacillus in Lactacyd. Just use enough lactic acid to have the right pH needed for vaginal care (acidic, but not too much) and let the bacteria produce it on the spot. 

Does Lactacyd have any preservatives? I guess it is designed to kill the “bad” bacteria but it should not interfere with the “good” bacteria?

[eisen]

The idea was to make something usefull as after-sun. 
Yogurt is a known remedy which brought me to try the sample which I got during the In Cosmetics. 
It worked well on the sun burned skin. 

[eisen]

I can report of the successful implementation. A contract manufacturer was not needed, I would like to thank the In Cosmetics. During the fair in NYC last September they provided free-of-charge sessions at the Formulation Lab – a purpose-built laboratory complete with benches and a range of equipment.
Ww tested the idea of the lyophilised bacteria but wanted to avoid parabens. The solution was simple: Avoid water and sugars which are food for bacteria. The formulation was based on the mixture of lactic acid producing lypohilisate in inert cyclosilicone. Intead of hyaluronic acid as a moisturiser we used glycerine and to exclude water we even added silica gel. To minimize the access of moisture, we decided to use a pumpable spray container. 
Wanted to share because just looked after the 6 months.