While eyebrow growth serum is specifically formulated for eyebrows, some people may also use it on other areas where they want to promote hair growth, such as around the hairline or on sparse patches in the beard. u003cbr/u003eu003cbr/u003eIt's generally considered safe to use homemade brow serum elsewhere on the body. But you may want to test a small amount first to make sure that there's no stinging, redness or other adverse reactions before goin all-in. And as we mentioned before, do not use it on the eyelashes!