I bought this out of curiosity after seeing it on YouTube without much expectation.. After using it for 3 days, I felt it was pretty good, so I recommended it to my daughter and decided to repurchase~~ It's a bit inconvenient to apply, but after using it, there's no stickiness and I feel healthy in the morning~~ The amount is smaller than I expected, so I use about 3-4 drops each morning and evening, and it runs out quickly.. I wish there was a refill size available.