I got it 6 months back
the red line indicates how much is left
I know it's not much but if you want to not waste money on an entire bottle and just try for some time to see results then go for it.

how to apply? moisturize your face and after 5 minutes apply retinol (don't include your eye and mouth area). apply moisturizer on it again after 5 minutes. this is the sandwich method.
NEVER USE IT DURING DAY TIME.