8 citations
,
January 2020 in “International Journal of Cosmetic Science” The combination of specific chemicals improves hair density in women.
7 citations
,
September 2004 in “대한의생명과학회지” An extract made from Polygoni multiflori Radix, Angelica gigantis Radix, and Lycii Fructus was found to increase hair density and prevent hair loss in most users when applied daily for 18 months.
5 citations
,
May 2004 in “Dermatologic Surgery” A hair restoration technique was introduced that mixes different types of hair groupings to reduce procedure time, limit damage, and potentially increase hair density, suggesting more hair can be transplanted than previously thought.
1 citations
,
December 2025 in “International Journal of Molecular Sciences” Atelocollagen boosts collagen production and improves skin elasticity in aged skin.
August 2023 in “Skin Research and Technology” BLH308, with persimmon leaf, green tea, and sophora fruit extracts, safely increased hair density and thickness.
September 2021 in “VNU Journal of Science: Medical and Pharmaceutical Sciences” Platelet-rich plasma, which has growth factors, is used in many medical fields and can promote tissue repair, stimulate hair growth, and increase hair density.
April 2023 in “Journal of Investigative Dermatology” ENERGI-F701 solution was found to be more effective and safer than Regaine® 2% minoxidil solution in treating female pattern hair loss, with increased hair density and less side effects.
72 citations
,
October 1998 in “Baillière's clinical endocrinology and metabolism” Long-term testosterone therapy can cause hormone suppression, affect prostate and heart health, and alter physical characteristics, but does not increase prostate cancer risk and needs more research for full risk assessment.
71 citations
,
August 2019 in “The journal of sexual medicine” Testosterone treatment effectively causes male physical development in transgender male adolescents but may lead to side effects like acne, higher BMI and blood pressure, lower good cholesterol, and decreased bone density.
6 citations
,
March 2016 in “British Journal of Dermatology” Low IGF-1 and high HDL cholesterol levels are linked to more hair loss in middle-aged women.
5 citations
,
April 2024 in “bioRxiv (Cold Spring Harbor Laboratory)” Aging skin shows thinner layers, fewer hair follicles, and new biomarkers like increased space between cells and smaller sebaceous glands.
2 citations
,
October 2021 in “Clinical Epidemiology and Global Health” High uric acid levels are more common in PCOS patients, especially those with androgenic PCOS, and are linked with increased cardiovascular risk and other metabolic issues.
1 citations
,
June 2017 in “PubMed” Keratogrow®, a spray made from patients' own blood, was found to increase hair growth and density when used twice daily for three months.
Editing the FGF5 gene in sheep increases fine wool growth.
January 2012 in “Human health handbooks” Low-level light therapy is FDA-approved for male pattern hair loss, increases hair count and strength, and is considered safe for use.
June 2021 in “Egyptian Journal of Dermatology and Venereology” Psoriasis, acne, and hair loss are linked to unhealthy cholesterol levels, increasing heart disease risk.
3 citations
,
January 2003 SPELA 707, a mix of eight herbal extracts, may help treat hair loss by activating hair growth and increasing hair density.
23 citations
,
May 2020 in “Cell Death and Disease” Blocking the FGF5 gene in sheep leads to more fine wool and active hair follicles due to changes in certain cell signaling pathways.
February 2026 in “Journal of the Korean Society of Cosmetology” The ampoule significantly improves hair density, thickness, and usability without side effects.
58 citations
,
January 2020 in “International Journal of Molecular Sciences” Different methods of preparing Platelet-Rich Plasma (PRP) can affect wound healing and hair regrowth in plastic surgery. Using a kit with specific standards helps isolate PRP that meets quality criteria. Non-Activated PRP and Activated PRP have varying effects depending on the tissue and condition treated. For hair regrowth, Non-Activated PRP increased hair density more than Activated PRP. Both treatments improved various aspects of scalp health.
32 citations
,
September 1997 in “Dermatologic Surgery” Mini-micrografting in hair transplants can give similar density to older methods with fewer sessions.
61 citations
,
April 2012 in “British Journal of Dermatology” Caucasian women's hair appears thickest in their 20s, with perceived thinning after mid-30s due to both decreasing density and diameter.
51 citations
,
November 1988 in “The Journal of Clinical Endocrinology & Metabolism” Higher levels of a specific hormone are linked to more chest hair and acne in men.
47 citations
,
June 1987 in “Journal of Plant Nutrition” Soil phosphorus is key for maize phosphorus uptake.
41 citations
,
December 2008 in “International Journal of Dermatology” South Korean women with hair loss have lower hair density and thickness compared to healthy women.
30 citations
,
December 2017 in “Clinical, Cosmetic and Investigational Dermatology” Parietal scalp area has lower hair density and smaller hair diameter in women with hair loss.
16 citations
,
January 2021 in “BMC Genomics” Higher hair follicle density leads to more wool in rabbits, influenced by specific genes and lncRNAs.
1 citations
,
May 2002 in “British Journal of Dermatology” Hair loss caused by longer latent hair cycle and sudden miniaturization, not gradual follicle size reduction.
Amaranthus extract cream safely boosts hair growth in men with hair loss.
August 2019 in “Journal of the American Academy of Dermatology” Ginseng and Albizia extracts help prevent hair thinning with age.