Yoggu! is natural product that does not contain any preservatives, artificial colours or stabilizers. Product discolouration is normal and safe to consume! Fun fact: strawberry is a great source of anthocyanin which is a natural antioxidant and anti-inflammatory compound. With all the benefits of anthocyanin, the compound itself is very sensitive and subject to degradation easily. Both oxygen and pH can accelerate the degradation of anthocyanin causing the colour to turn blue and grey.