Hair growth products are popular, especially among athletes, as they are thought to help athletes shed excess hair.
They also help improve athletic performance.
But research suggests that a hair-growth supplement, whether for an athletic purpose or not, may not help improve performance.
According to a new study, published in the Journal of Clinical Endocrinology & Metabolism, some hair growth supplement users actually had worse performance than controls.
The study analyzed the data of a nationally representative sample of 1,500 U.S. adult hair care professionals.
The results were stark.
For each participant who took at least three supplements during the three-month study period, their performance fell by 10 points.
Those taking at least two supplements had a 3.5 point improvement in their performance.
Those who took only one supplement had an 8.6 point improvement.
The difference was statistically significant, with a 95 percent confidence level.
The participants who were on hair growth supplements had significantly worse performance.
They had an average of 6.8 points of decline per month compared to the control group, who averaged 2.4 points.
Hair growth is a popular cosmetic product.
It is used in hair color, color correction and other hair growth treatments.
The drug used in the study, known as DHT1, is a potent inhibitor of the growth factor receptor (GFR), a protein that is found in hair.
In other words, hair loss results from a breakdown of the GFR.
The drugs used in this study also block the action of the hormone IGF-1, which is responsible for hair growth.
IGF-2 and IGF-3 also inhibit the GHR, and IGFBP-1 is involved in hair growth, but only the latter is a known growth factor.
“Our study provides a clear indication that hair growth drugs may have a negative impact on hair follicle growth and function in the short-term and may have negative consequences in the long term,” said study co-author Dr. Paul B. Vollmer, a dermatologist at Boston Children’s Hospital.
He said that IGF-BP-2 is a potential growth factor that may not be fully accounted for in hair loss.
“We need to understand what other factors are involved in this condition before making a final decision,” Vollmed said.
The researchers also said that hair loss is a complicated condition that can involve many factors.
“While the data in this paper is limited to the U.s., it is important to note that in general, hair growth is associated with a number of health problems including skin disorders, and these conditions are related to IGF-mediated growth factors, including growth factor-binding proteins,” Dr. Vellmer said.
Some studies have suggested that hair losses may also result in increased risk of certain cancers, particularly cancers of the cervix, uterus and ovaries.
“As hair loss becomes a more prevalent and chronic disease, it is imperative to understand and manage the risks associated with hair loss,” Dr Vollmers said.
Dr. Beketee Chatterjee, an endocrinologist at Harvard Medical School, agreed.
“In my opinion, the evidence is strong that hair and hair growth are important factors in the development of many diseases,” Chatterji said.
“These include a wide range of cancers, including cancers of breast, ovarian, and colon, among others.”
But she added that it is unclear whether taking hair-based products improves athletic performance or just helps people lose weight.
“It is not clear whether the benefits outweigh the risks,” Chaterjee said.
A new drug in the pipeline?
The study is not the first to suggest that hair-boosting supplements may actually worsen hair loss and lead to more cancer.
A study published in Nature last year found that a type of protein found in the skin called CCA-1-linked protein (CBLP), which is found primarily in skin, may be a candidate for hair-enhancing effects.
CBLP is the type of peptide found in many hair growth-boosters and hair loss supplements.
Researchers at the University of California, Los Angeles, studied a small group of participants, some of whom had taken hair growth and scalp treatment supplements, and found that those taking hair products had higher levels of CBLPs and lower levels of other peptides, such as IGF-binding protein (IGBP), compared to those who were not taking these products.
CABLPs have also been linked to a number other health problems, including diabetes, depression and anxiety.
A small group in a large study, however, found no connection between CBLAs and any of these conditions.