"Love the fact the concentrate comes in a dripper bottle - so handy and doesn't allow for waste of product. I dropped the instructed 5 drops of the solution into my night-time moisturiser to begin with and found this really elevated the effects of the night cream. No stickiness or skin irritation after use. Further into testing, every few days I applied the drops straight on to my face directly and, again, no sign of irritation, which is fantastic for someone with senstive skin. My skin is looking brighter and slightly more even in colour (I have dark/red blotches here and there). Looking forward to continuing using this concentrate and the effects hereafter."