Physicians Formula Eye Booster, Lash-Enhancing 2-in-1 Eyeliner Serum, Dermatologist Approved, Hypoallergenic, Cruelty-Free & Vegan - Blackest Black

This is one of the few eyeliners I buy time and time again. The brush applicator is so smooth and makes such nice lines, so it's so much easier to apply and do wings if I want. It's not waterproof, but it's not advertised as such so I am happy with how long it stays. It never bothers my sensitive eyes and one pen will last a long time without drying out or picking up other makeup. Also love the deep brown color! Not as intense as a black liner while still giving dimension and brightening my eyes.

I absolutely LOVE the brush tip. It’s quite long and sharp, so it’s really easy to work with. The formula itself is good enough, and probably the best waterproof eyeliner I’ve gotten that’s reasonably-priced. It glides on well, is quite pigmented, and works great overall. I wouldn’t say it lasts all that long, but definitely far more than any typical liquid eyeliner will (especially if you layer it); I wear a LOT of eyeliner though as a goth woman lol. I’d say it reasonably lasts 6-8 hours, sometimes an entire day; it also helps if you regularly deal with the oil that might build up on or around your eyes during the day (because oil will take it right off). However, after having used like 6-8 by now, it typically dries out after the first couple days of use, then makes a come back a few days later. I have no idea why, but just know, if it seems to dry up fast, it’s probably not actually “gone” or used up. I’m impatient though, so sometimes I will add a touch of water… which you probably aren’t supposed to do for a waterproof eyeliner, but oh well 🤷‍♀️ It completely revives it, so I don’t really care. I’d recommend layering the eyeliner 2-3 times (not much more, or else it will pill and might flake off a bit), because the formula is pretty thin. Also, I have decently sensitive skin, and this formula has caused me absolutely zero irritation or any other problems. Idk I think it’s definitely worth a try at least if you’re looking for a reasonably-priced water-resistant eyeliner.

I’ve bought this eyeliner multiple multiple times, in brown and black. And use it every day. I like a natural look for daytime and I use a magnifying mirror and LOVE IT for tight lining precisely, right next to the lash line or even dotting between the lash hairs. Can also go more dramatic with it too for evenings. I wish it came in more colors but I’ve found I can also layer a different color eyeshadow as liner over it once it dries, even feather that shadow out for a soft look so it is actually versatile. Easy to control, stays put 1000% once dry, easy to remove, no irritation at all. It just works fantastically. Not so good for the waterline — better on skin. Occasionally will use for a missing eyebrow hair/tiny bald patch in the eyebrow.

***UPDATE: Since writing the original review I repurchased this product for the fourth time (in Ultra Black) to check again if I could make it work, since I stumbled across a couple recent reviews talking about having to shake up the pen A LOT. I am so happy to update this review to four stars. My newest one is just as deep, opaque black and smooth as I remember from my old ones. Surprisingly, I didn't have to shake more than 20 seconds initially. So I don't know for sure if the ones I bought before that were terrible were duds, or if some of the pens when new have to be shaken for quite a while to get them started. That's why I rated it four stars instead of five, since there may be quality control issues. BUT I still recommend this more than any other drugstore liquid liner. It's seriously worth giving a shot before writing it off. As for the eyelash growth claim, it is unlikely to work for that because the "active" ingredient (myristoyl pentapeptide-17) has no published, peer-reviewed studies backing it up for lash growth, although that doesn't mean it won't do something. It just means that it hasn't actually been scientifically shown to do anything yet. Some people say they have noticed a difference though so it probably can't hurt to try. But I recommend this liner because of its perfect tapered brush tip that blows any felt tip or cheap, skinny brush tip out of the water. It's also black black black and resists smudging quite well, even on my oily lids in the heat of a Texas summer. It takes a long time for the pen to dry out, too, although after a while you do sometimes have to stop during application and shake again a couple times, but I personally don't mind. It may smudge if you have seriously watery eyes and it does dry down to a slightly shiny finish, which you may dislike if you prefer completely matte black liner. In any case, I am so incredibly thrilled to be able to recommend this again and to use it again. I will repurchase forever, even with the possibility of dealing with duds. See original two-star review below. ***Original review: Writing this review breaks my heart. When this product first came out, it was definitely instantly in my top 5 list of fave makeup products ever. It was my number one fave liner ever. The brush tip is genius. So easy to use for a perfect line, thick or thin, and makes the flick of a cat eye so so easy. This product is the reason I will never be satisfied with anything but a brush tip liner for cat eyes again. I can't speak to the lash growing claim, but the brush tip, price, long wear, smudge resistance, and long period of use before dry out made this product a star. So what is the problem? Well, another of the winning features of this liner was that the shade Ultra Black was super super black, as you would expect. It pains me to say that, unfortunately, Physicians Formula at some point a couple of years ago reformulate the shade Ultra Black and now it is not as black. In fact, it's not even opaque, even after multiple passes. I was so incredibly disappointed in this that I have even purchased the product multiple times since the reformulation, hoping that it was just a fluke, but each purchase has ended in a return. No more. I am also not the only former fan to notice this change. I am looking for a replacement now. So far the new fave is Kat Von D Tatoo Liner, which is a bit pricier and harder to get. Too bad. I really can't imagine who would enjoy this product now, since it doesn't provide an opaque line. But, I can at least still say that the ease of use and brush tip are still great, hence the two stars.

I’ve ordered this eyeliner several times, and it never disappoints! It’s very easy to apply, even if you’re not great at doing eyeliner. The tip is precise, the color is rich, and it lasts all day without smudging. This has become one of my favorite eyeliners, and I’ll definitely keep buying it. Highly recommend!

This is really great eyeliner I've never found one I could use without it irritating my eyes and this one doesn't irritate my eyes!!! Yay and it helps to nourish lashes!? Double yay! It has great flow for even application and a precise fine line. It doesn't smudge and it's humid and hot out here in MI so I give it 10 stars!!!

I've tried it for 3 months and now the tip gets dry by the time I'm doing my 2nd eye, leaving me to finish the look with another liner. Not great. I really liked it at the beginning. It doesn't smudge, lasts all day, no allergic reaction, great color pigmentation. It's true that it'll crumble if you rub your eyes, but it will not smudge. However, the Stila and KVD liners I got in the same order are still going strong, and the liner itself seems to be plenty full so it's the tip drying that leaves me hanging every time now (last two weeks). I think the value for the money gets cancelled by this issue, so it's unlikely I'll get it again. Bummer, because I did like it better than the Stila since the line is smoother on application and dries out even. I'm still looking for my ride or die liner.

Wanted to try a brown liquid eyeliner I typically do go for clean formulas. I’m not sure if this is very clean. I know it’s for sensitive eyes, but I thought I’d just give it a try. this product is absolutely amazing. It works like a dream. I will follow up with a photo, and also will follow up how long it lasts. I’m not using it on a daily,but I’m very pleased with how easy it goes on how good it looks. The color is awesome and stays all day even through chiropractic appointments when my face is squished in that pillow, it’s not a flake, not a smudge and to come off even water takes it off even though I double cleanse every night this is highly recommended in the price point is inexpensive and it came really quick as far as it being a serum for eyelash growth. I have not noticed anything yet, but will follow up if I do that’s not why I bought this, but it was a nice bonus.

My favorite eyeliner ever!!!! It’s amazing and so easy to apply. I buy 6 at a time so I never run out

I got an eye allergy! Do not buy !

Lo compre por probar ya que el que uso generalmente no estaba disponible. Siendo más barato es mucho mejor, con mejor aplicación, más densidad del color y aguanta mejor. Volveré a comprar este.

I wear eyeliner every day, and this is the best one I have ever tried. I have purchased this many times, and will continue to do so as I have yet to find one that can beat its quality. I have very oily skin, and oftentimes eyeliner will smudge or lose its pigment on my eyelids. This one stays in place. The best part about this eyeliner is that the tip is a brush and not a traditional felt tip pen; I find with felt pens the black pigment inevitably stops reaching the pointiest, tiniest part and ruins the precision of my looks. This eyeliner retains the continuous colour to the very tip thanks to the brush applicator. I use Ultra Black and it lasts all day. Worth every penny.

Don’t mind my struggle to get the package open it was not as hard as I probably made it look. I really like the formula of the liquid, the feel on the skin, and the shape of the applicator. Was very easy to get a nice shape and a smooth line. The one thing is if I bought again I probably would by the true black rather than just the ‘black’ as this one is more of a charcoal or dark grey and I do like a really rich black.