So, you already have a lash serum and are pretty pleased with your lash results but when you look at your eyebrows, you can’t stop but think how they’re in need of some extra love. Naturally, you start to wonder:

“Can you use an eyelash serum on eyebrows?”

As a lash tech, I often get asked this question so I wanted to cover it on my blog.

Let’s dive in!

Does Lash Serum Work on Eyebrows?

Now, have you ever heard of the saying: “just because you can, doesn’t mean you should“?

This here is a prime example. Although it would work, it certainly won’t be optimal. Let’s see what the drawbacks would be.

What Happens When You Use a Lash Serum on Your Eyebrows?

1- You Waste Product

The applicators used for both products may seem similar at first but they are actually very different and for good reasons.

Lash serums come with a fine eyeliner-type applicator that glides smoothly along the lash line. You need precision here to aim at the root of the lashes and you don’t need a lot of liquid.

On the other hand, the applicator for your brow serum is thicker and firmer so that the liquid can reach the root of the hair follicle without wasting too much along the way. You can imagine how your brows are a lot denser, thus the more sturdy applicator.

All this to say that the delicate lash serum applicator is not ideal for your thicker brows. You would most likely end up using more of the product that you need and waste a lot of that expensive liquid gold.

2- You Don’t Use Ingredients to Their Full Potential

Did you know that although brow serums and lash serums have similar ingredients, there are some key differences given the specific nature of each area?

For example, eyelash serums often focus on lengthening lashes, while eyebrow serums may contain ingredients that help to thicken and fill in sparse brows.

As such, brow serums are typically heavier on the keratine and amino acid while lash serums are more focused on peptides and prostaglandin analogs.

3- You Risk Irritation

Several eyelash growth serums on the market use an active ingredient called “prostaglandin analog”. These are clinically proven to promote lash growth, however, they also come with possible side effects because you’re using a lot more of the product.

Some of these are irritation, redness, itchiness, but also darkening of the skin, and fat atrophy.

Remember earlier I said you’ll most likely use too much product if you use a lash serum on your brows? Well, guess what, now you’ve increased your chances of having an adverse reaction.

Why Still Use an Eyelash Serum on Eyebrows?

I have to ask you this question…

Why do you want to use your lash growth serum on your brows in the first place?

We know there are drawbacks.

So why do it?

I personally can only think of two reasons:

1. You ran out of brow serum and therefore are using your lash serum temporarily.
2. You don’t want to buy two products to save money.

For the first reason, I can totally understand since it happened to me once.

However, for the second one, I am not so sure. Although it’s true that the initial investment in 2 products is more expensive, you also get more products! (I know captain obvious…).

If you only buy one lash growth serum to do your eyelashes and your brows, you will run out very rapidly and you’ll need to buy a new one sooner.

So in the end, I don’t think you’ll be saving anything at all.