Liked it, but I didn't have any major nail issues when I started using this. Would repurchase.

I am almost certain this stuff works.
My nails peel all the time. I work at a cafe, and I wash my hands too much in general, which I think is why they peel so much.
Anyway, every single time I do my weekly manicure, base coat, top coat and all, five days in and the the top layer of nail has started to split from the rest of the nail on almost every finger. When I remove the polish, I have to buff the top splitting layer away, leaving me with flimsy, thin nails that peel even more quickly, eventually leading me to cut them all really short and starting this process again.
I used this as a base coat for the first time, and was kind of just like, "Yep, another "miracle cure" nail product that will do nothing, just sit of top of my nail and chip off and just be generally useless". But I was pleasantly surprised. For the whole week, it sat under my polish, keeping all of it mostly intact (even after three busy days at work), and it appeared as though my nails weren't peeling! I thought, surely the peeling is just hiding, and will reveal itself once I remove the polish.
But no! No peeling at all! This is the first time I have gone a week without peeling nails for as long as I can remember. Yay! So that was pretty good.
The only problem I have with this product, that I can think of, is one I have with all China Glaze polishes, the brush is a bit thin. But to be honest, I don't care about that, because it works.

For now, I will continue to use this as a base coat, and update if anything changes!

Veryy bad! It did nothing to my nails!

My nails are weak and tend to split so I'm looking for a good strengthener. I've been using CGF for about a month now and really haven't seen any great results. I've used Nailtiques in the past and this is nowhere near as good.

I love this, i don't use it everytime i do my nails, just when i want to grow them out or if they've been a little dry. Its sort of thick but i like that. I don't think its ment to really be a basecoat, more of a treatment, but i use it as a basecoat all the time and it works fine, polish goes over it with no problem, i really do see a diffrence in how fast my nails grow with this, i'll definitely buy another bottle when i run out.

A great base coat but I don't see anything major yet.
EDIT: Up to 5 lippies. My manicurist is convinced that this is the product that has changed my nails from brittle, soft and short to hard, strong and beautiful nails. Love this product and I'm on my second bottle.

I think CGF has made my nails stronger, but they do still tend to split. I love to use it as a basecoat and for that it workes great! Not sure if I'd repurchase.

I have gone through about 5 bottles of China Glaze's Calcium Gel basecoat, and that's unprecedented. It's my HG, though I know there are some others out there that sound just as good (Barielle's Camo, SH Nail Quencher). But I'm in love with Calcium Gel. It doesn't strike me as a nail treatment as much as a nail protector. It has a nice, somewhat thick (hence the gel designation) consistency. I've not only had less chipping with this base coat, my nails seem stronger when I am wearing it. The protection helps especially when it comes to water, as I'm not always good about wearing gloves. I have less peeling with Calcium Gel too. My only quibble is I have to order this online; I've never seen it in a store. Highly recommended, though! I will despair if ChG ever stops making this.

I am in need of better stronger nails. Cannot say that anything has really helped my nails get there. But this product has done a good job of protecting my nails and it does not flake off after multiple times of washing my hands which I was finding with some other products, very embarassing when working with patients. I found it to be moderately more expensive than say Sally Hanson, but will buy again if ever run out.