Mini brown mascaras are a niche product in the beauty industry, often overshadowed by their black counterparts. However, they are worth considering for several reasons.

Firstly, brown mascara can provide a softer, more natural look compared to black mascara. This makes it an excellent choice for those who prefer a subtle enhancement to their lashes rather than a dramatic effect. It's also a great option for individuals with lighter hair colors, as it can blend more seamlessly and look more natural.

Secondly, the mini size of these mascaras can be a significant advantage. Mini mascaras are perfect for travel or carrying in a small purse for touch-ups throughout the day. They also allow you to try a product without committing to a full-size version, which can be particularly beneficial if you're experimenting with a new brand or formula.

From a formulation perspective, the color of the mascara (be it brown, black, or any other color) does not affect its efficacy. The primary function of mascara is to enhance the length, volume, and curl of the lashes, and this is determined by the formula's ingredients, not its color. Therefore, a brown mascara can perform just as well as a black one, provided it has a well-formulated, effective formula.

In conclusion, mini brown mascaras are worth it if you're looking for a more natural look, want a travel-friendly product, or wish to try a new formula without committing to a full-size product. However, as with any beauty product, individual preferences and needs will ultimately determine whether it's the right choice for you.