Biotin, also known as vitamin B7, is the most popular B vitamin associated with hair health—and for a good reason! Termed initially as vitamin H for Haar und Haut (German for "hair and skin"), experts have shown that this vitamin is crucial for maintaining healthy locks, brows, and lashes. 

A deficiency in this essential B vitamin can cause hair shedding, thinning, and even loss of color. Biotin is also used by the body for its role in energy production and has been shown to improve hair's overall health and vibrancy. When applied topically, evidence shows that biotin can improve hair strength, elasticity, and durability while promoting new hair growth. 

Castor oil, a nutrient-dense oil extracted from castor beans, is one of the most enriching oils for skin, scalp, and hair. On a molecular level, castor oil is a long-chain fatty acid that provides the hair follicles with essential nutrients, all while increasing beneficial circulation.

As a result, castor oil can strengthen hair strands, heal dryness, and make the skin a better environment for healthy hair growth. Paired with other beneficial hair ingredients, like those found in

The Brow Balm

, castor oil can increase the absorption of other products and ingredients so that each can penetrate the hair

Ricinoleic acid is an unsaturated omega-9 fatty acid and a hydroxy acid highly concentrated in castor oil (about 85-90%).  Castor oil can thank much of its hair (and health) benefits to this anti-inflammatory acid known to enhance hair follicles' health and protect against breakage and hair loss.

Jojoba oil is a gentle, occlusive plant oil that can be used around the eyes to help grow eyebrows out and maintain their thickness. Due to its intense moisturizing properties, jojoba oil nourishes and conditions hair strands from the inside out while keeping hair follicles clear and healthy. 

Research suggests that the molecular makeup of jojoba oil closely resembles our skin's natural oils, so you can expect this plant to hydrate and condition the skin beneath the brows too, repairing and maintaining the skin's delicate barrier. All of the nutrients and hydration that jojoba provides ensure that your brows are well nourished to support their growth and resilience.

As one of the best essential oils for hair growth, lavender oil is full of nutrients that your brows love. This antimicrobial, anti-inflammatory oil encourages hair growth by stimulating the hair follicles and improving circulation. 

Scientific studies have found lavender oil to be an effective, natural treatment for preventing hair loss and promoting growth. Those

studies performed on mice

showing that lavender supports a significant increase in hair follicles and a deepening of follicle depth.

Shea butter's natural emollient abilities soften and condition eyebrow hairs, providing them with the environment and nutrients they need to thrive. Shea butter will continue to nourish eyebrows and the surrounding skin with vitamins, antioxidants, and fatty acids. Even after the first application, shea butter can make your brows appear thicker and fuller.

Another essential oil widely used for hair growth is clary sage. Similar in makeup to lavender oil, clary sage is a known hair growth stimulant that is an excellent ingredient for treating the brows. One way clary sage supports hair growth is by boosting blood flow beneath the skin, which supplies the essential nutrients and oxygen needed for longer, fuller hair.