Evidence supporting the use of: PABA (para-aminobenzoic acid)
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Para-aminobenzoic acid (PABA) has a long history of use in alternative and folk medicine for supporting hair health, particularly in the context of hair loss or premature graying. The traditional belief stems from observations made in the mid-20th century, where anecdotal reports and a few early studies suggested that PABA supplementation could restore hair color and reduce hair thinning, especially in cases thought to be due to nutritional deficiencies. Notably, PABA is sometimes referred to as a “vitamin” (formerly called vitamin Bx), though it is not officially classified as such. The mechanism proposed is that PABA may influence the synthesis of folic acid and contribute to healthy hair growth by supporting cellular processes.

However, the scientific evidence supporting these claims is limited and dated. Most modern clinical studies have not confirmed a significant effect of PABA supplementation on hair loss or regrowth in the general population. Some older studies, such as those conducted in the 1940s and 1950s, reported hair repigmentation in certain cases, but these findings have not been robustly replicated in high-quality randomized controlled trials. Today, PABA is rarely recommended by dermatologists or hair specialists for the treatment of hair loss due to the lack of strong evidence. Its use persists mainly in traditional and alternative health circles, and it may still be included in some multivitamin or hair supplement formulations.

In summary, while PABA has a traditional reputation for supporting hair health, the evidence base is weak, and its efficacy for hair loss or thinning is not validated by contemporary scientific research.

More about PABA (para-aminobenzoic acid)
More about Hair (loss or thinning)

Other health conditions supported by PABA (para-aminobenzoic acid)

Hair (graying)
Hair (loss or thinning)