A couple of years ago I wrote this post about the amazing M2 Beaute Eyelash Activating Serum and since then there has been a influx of similar lash enhancers that claim to make your eyelashes grow. My lashes aren't particularly short or sparse and I hadn't tried any others since the M2 Beaute but since I stopped using it my lashes kind of went back to the length they were before. I started using Rapid Lash about a month ago and within a week I noticed a massive difference. I immediately stopped using it nightly and I probably only use it once a week, maybe twice, and my lashes look great; if they were any longer they would be too long, as it they reach my eyebrows when I curl them.
I do think these topical treatments only work as long as you use them, which is something to consider with upkeep. The directions advise use nightly before going to bed but as soon as you're happy with the length I think you can dial that back just to upkeep, which also makes a tube last a lot longer and becomes much more cost effective.
Personally I think the Rapid Lash is fantastic, I had serious results in a super fast time. I will say I did also try the Rapid Brow at the same time and that had no effect on my brows at all, but I have tried many things over the years to grow my brows with little effect (I think the hair follicles no longer exist) so I wasn't surprised I had no brow luck. I know there are quite a few of these lash products on the market, please let me know in the comments which ones, if any, you've had success with or not. I had excellent success with both Rapid Lash and M2 Beaute, they were both brilliant but also wildly different in price; M2 Beauty is £125 while Rapid Lash is a much more agreeable £39.99.
You can also try castor oil as a natural option to grow your eyelashes and eyebrows. This is easily found in your local pharmacy for very cheap and you apply the oil to the base of your lashes and brows with a cotton bud. This does tend to go in your eye and, whilst not harmful, is not particularly pleasant. It does work, but definitely not as well or as fast as the serums.