Name: Latisse (Bimatoprost Ophthalmic Solution)
Brand: hers

Overview

What it is

Prescription with 8 ingredients

Cool Features

It is cruelty-free, fungal acne (malassezia) safe, and reef safe

Free From

It doesn't contain any harsh alcohols, common allergens, fragrances, oils, parabens, silicones or sulfates

Fun facts

hers is from United States. This product is used in 10 routines created by our community.

What's inside

Ingredients Explained

Bimatoprost

Bimatoprost is a synthetic prostaglandin analog used to promote eyelash growth.

This ingredient can cause side effects such as periorbital fat atrophy (a reduction in fat around the eyes) and increased iris pigmentation which may make the eye color appear more brown.

One study found that some of these changes can reverse after discontinuation.

Learn more about Bimatoprost

Benzalkonium Chloride

Antimicrobial, Preservative, Surfactant

Benzalkonium Chloride (aka BAC) is a preservative that has been around since the 1930's. It is also a surfactant that gives it mild cleansing and antistatic properties.

BAC works because it carries a positive electrical charge that attract the negative charge of microbe cells (like a magnet). Once BAC sticks to a microbe, it breaks the microbe cell's outer wall and scrambles its proteins to kill it.

The maximum usage percentage for this ingredient is 0.1% in both the EU and Chinese cosmetic regulations.

The CIR Expert Panel has concluded it to be a safe antimicrobial agent in concentrations up to 0.1% and it is permitted up to 3% in rinse off hair products.

BAC can be irritating at higher concentrations but a true allergy to it is pretty rare. Be sure to patch test if you have a damaged skin barrier or just sensitive skin.

Because it's a cation, it is incompatible with anionic surfactants like SLS (they neutralize each other).

Learn more about Benzalkonium Chloride

Sodium Chloride

Masking

Chances are, you eat sodium chloride every day. Sodium Chloride is also known as table salt. This ingredient has many purposes in skincare: thickener, emulsifier, and exfoliator.

You'll most likely find this ingredient in cleansers where it is used to create a gel-like texture. As an emulsifier, it also prevents ingredients from separating.

You might see people debate whether Sodium Chloride is comedogenic, but there actually haven't been any comedogenic tests done on it. Either way, the overall formulation of a product matters a lot more than any single ingredient.

You might see this ingredient used in scrubs as a primary exfoliating ingredient.

Learn more about Sodium Chloride

Sodium Phosphate

Buffering

Sodium Phosphate is is behind-the-scenes formulation helper. Its main job is buffering, or locking in the product's pH.

This helps ensure the formula stays at its intended acidity through manufacturing, shipping, and sitting on your shelf. Many active ingredients like vitamin C or retinoids are pH sensitive so maintaining their happy pH range matters.

It is synthetic and reported use concentrations are very low (up to 0.086% in face powders).

Learn more about Sodium Phosphate

Citric Acid

Buffering, Masking

Citric Acid is an alpha hydroxy acid (AHA) naturally found in citrus fruits like oranges, lemons, and limes.

Like other AHAs, citric acid can exfoliate skin by breaking down the bonds that hold dead skin cells together. This helps reveal smoother and brighter skin underneath.

However, this exfoliating effect only happens at high concentrations (20%) which can be hard to find in cosmetic products.

Due to this, citric acid is usually included in small amounts as a pH adjuster. This helps keep products slightly more acidic and compatible with skin's natural pH.

In skincare formulas, citric acid can:

While it can provide some skin benefits, research shows lactic acid and glycolic acid are generally more effective and less irritating exfoliants.

Most citric acid used in skincare today is made by fermenting sugars (usually from molasses). This synthetic version is identical to the natural citrus form but easier to stabilize and use in formulations.

Read more about some other popular AHA's here:

Learn more about Citric Acid

Water

Skin Conditioning, Solvent

Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.

So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.

You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Remember to stay hydrated!

Learn more about Water

Sodium Hydroxide

Buffering

Sodium Hydroxide is also known as lye or caustic soda. It is used to adjust the pH of products; many ingredients require a specific pH to be effective.

In small amounts, sodium hydroxide is considered safe to use. However, large amounts may cause chemical burns due to its high alkaline.

Your skin has a natural pH and acid mantle. This acid mantle helps prevent harmful bacteria from breaking through. The acid mantle also helps keep your skin hydrated.

"Alkaline" refers to a high pH level. A low pH level would be considered acidic.

Learn more about Sodium Hydroxide

Hydrochloric Acid

Buffering

Hydrochloric Acid can be found in the human body. It used to adjust pH levels of basic solutions.

Another name for this ingredient is muriatic acid.

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