I've contacted them myself about this, and I got a very promising reply from them, coming from one of their marketing executives:
Thank you for your email and your interest in the Kaeso collection.
Please see the below information which I hope is helpful to you.
Each product has been carefully designed to meet with Kaesos Innocence Criteria. To meet this criteria all products must be free from Parabens, Sulphates, Propylene Glycol and Mineral Oil and then they are proudly stamped with the Kaeso Leaf of Approval.
We do not test our products on animals, which actually prevents us from selling our products in China .
All Kaeso Manicure & Pedicure products have been checked and are Vegan-friendly.
All Kaeso Skincare and Facial product are also Vegan-friendly except for the Moisturising Soufflé Body Moisturiser which contains Lanolin and Beeswax and the Collagen and Micro Current Gels which contain Collagen.
All other products in the Kaeso range are safe for vegans and vegetarians.
As Kaeso are owned by Professional Beauty Systems (PBS), I feel confident in thinking their other products are also Cruelty Free. I have emailed them directly about their other products, and received similarly positive responses.
Their other products are SkinTruth, AromaTruth, and TanTruth, amongst others, the names of which escape me at the moment. I'll stress that I'm still a student, but I've done a lot of research. I decided to stay cruelty free early, and I've done plenty of research.