This is my 3rd Bottle of the Goodal serum! 4 words: An Absolute Holy Grail !!! Unlike other vitamin c serums, it doesn’t seem to oxidise so you know that it will still be good within 3 months (which is a standard timeframe for any skincare product of its size to run out). Definitely a value for money! My skin used to have a long turnover period thus it would take a while for my acne scars/hyperpigmentation to fade probably due to my dehydrated combination skin type but ever since I used the serum, they fade completely within a week!