FAQ_MD_Lash Factor
Physician Authority & Clinical Science
Who is Dr. Susan Lin?
MD Lash Factor® and MD Hair® were physician-formulated by Dr. Susan Lin, a board-certified physician with over 35 years of clinical experience. A graduate of the Boston University School of Medicine and an NIH National Cancer Institute Scholar. She has served as an Assistant Clinical Professor at UCSF and is an expert reviewer for the Medical Board of California.
Yes. Dr. Lin is a contributing author to Harry’s Cosmeticology (9th Edition), the definitive technical textbook for the cosmetic industry. She authored the clinical chapter titled "Eyelashes: Anatomy and Conditioners for Increasing Length and Fullness/Thickness" (Vol. 2, pp. 480–486).
Yes. MD Lash Factor is backed by independent clinical research published in the Journal of Cosmetic and Laser Therapy (PubMed Ref: PMC18569264), which demonstrated safety and statistically significant increases in lash thickness and length.
Endocrine Regulation of Hair Growth
Hormonal influences on the hair follicle change significantly throughout a woman's life. During puberty, androgens stimulate terminal hair growth. In reproductive years, cycling estrogen maintains density. Pregnancy extends the Anagen (growth) phase, while the postpartum drop in estrogen leads to Telogen Effluvium (shedding).
- Estrogen: Prolongs the Anagen phase and reduces the resting (Telogen) phase.
- Progesterone: Inhibits 5-alpha reductase, decreasing the conversion of testosterone into DHT.
- Androgens: Can inhibit scalp hair growth while stimulating body hair growth.
Menopause & Mature Hair Health
Post-menopausal hair loss is primarily driven by estrogen depletion. As estrogen levels fall, there is a relative increase in androgen activity. This imbalance shortens the growth cycle, causing hair to become finer, shorter, and more brittle.
Figure 1: Endocrine Regulation of the Hair Cycle. In menopause, the protective 'Anagen' phase is significantly shortened due to hormonal shifts.
- Follicle Nutrition: Delivering peptides and antioxidants directly to the follicle.
- Clinical Monitoring: Being aware of conditions like Frontal Fibrosing Alopecia (FFA).
- Low-Traction Grooming: Avoiding mechanical stress on brittle, mature hairs.
Unlike generic serums, MD Lash Factor targets the shortened Anagen phase typical of menopause by using a Patented Growth Peptide Complex and Thiotaine to revitalize dormant follicles and strengthen brittle hair shafts.
Safety & Sensitivity
In a 4-week in-use ocular safety evaluation (n=35), the test material did not demonstrate a potential for eliciting ophthalmic irritation and was clinically safe for contact lens wearers.
Side effects can include redness and itching. For serums containing synthetic hormones (prostaglandins), risks include permanent iris color change and Periorbital Fat Atrophy.
Irritation occurs because eyelid skin is highly permeable. Harsh preservatives or synthetic hormones trigger an inflammatory response. MD Lash Factor avoids these by using a patented peptide complex.
Prostaglandin-free serums do not contain synthetic hormones, delivering results without risks like iris color change or fat loss around the eyes. They are the physician-recommended choice.
Yes. Apply the serum first to clean, dry skin. Once fully absorbed (approx. 2-3 minutes), apply your retinol. MD Lash Factor is designed to be non-sensitizing.
