My skin type is oily and I don't generally got problems with acne, but because of the harsh winter weather in Norway my skin broke out due to confusion of my own skin's oil balance. The serum is way less moisturizing than the iUnik tea tree serum so I can't use this in morning in winter season, but is more effective fighting against acne and prevent new ones. I believe in summer I would definitely use it for both day and night, since the serum does well in oil controlling as it's not too moisturizing and I've seen my pores getting less visible. My skin purges from this so keep mind in that, but my skin cleared much more after that. I will repurchase it again and probably try the toner version as well. As for how long it lasts, I used every night for 2 weeks and still got 80% of the bottle to finish since I use 3-4 drops. Remember to shake the bottle as well!
