Seems very effective!

I've been using this serum for just a few days, twice a day, and have to say I really like it. It definitely reddens the lips almost instantly, which doesn't last very long but seems to be gradually helping to build up a bit of colour, I think, in between applications. I think my lips are looking just overall better for use - not Angelina Jolie plumped up or anything, but just "nicer". I like using it, and will be interested to see how it goes after 30 days' use. You do have to be careful not to get it round the surrounding area of your lips as it will redden that area too and have a certain amount of stinging/tingling (as it does on the lips for a while - but the sensations don't last that long). Even if you do get it around the lips, it settles down fairly quickly, just something to be aware of if you're about to go out, as it's not a terribly attractive look!