keep chilled [SEP] it s a great vitamin c ampoule but you need to use it within mths i keep it in the fridge to extend the life of this serum it s slightly thick like oil and has a very pale yellow hue to it the scent of this stuff is faint and subtle but doesn t smell bad it s kept in a dark glass bottle to prevent light when effecting the serum it absorbs into the skin well and it has helped with my skin complexion great stuff