[Marika]

I love Trehalose, once tried it and now have it in all my creams, heat it in the water phase. 3% is too much, no wonder it feels sticky. I add 1%, but I’d suggest starting with 0,5%.

[Marika]

I guess the culprit is NeoDefend (Gluconolactone, Sodium Benzoate). Here are some tips from Lotioncrafter (they sell NeoDefend):

In some formulations, NeoDefend^TM has been found to cause a pH drift downwards. In such situations, sodium citrate or phosphate buffers can be used to stabilize the pH. Dose the final product with the required level of NeoDefend^TM along with 1.5x amount of sodium citrate. For example, a 2% dose of NeoDefend^TM should be accompanied by 3% sodium citrate. Mix thoroughly to ensure all solids have dissolved and adjust the pH of the formulation to 7.00 - 7.25 with 30% sodium hydroxide. Finally, adjust the pH to desired final product pH (pH 5.4 – 5.5 is ideal) with dilute sodium hydroxide or citric acid solution.

In fact, these recommendations have been taken from one of Lonza’s docs for Geogard Ultra (same INCI as NeoDefend). There is a bit more detailed info on the last page of another Lonza’s guide:

geogard_ultra_product_users_guide_bh.pdf 1 MB PDF - Click to view

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