January 1992 in “Proceedings of the New Zealand Society of Animal Production” Ferret hair growth starts between 0 and 4 days after melatonin treatment, with cell growth peaking in the hair germ and declining as the hair matures.
73 citations
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July 1977 in “Archives of Dermatology” Applying safflower oil to the skin reversed fatty acid deficiency symptoms in 21 days.
59 citations
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July 2015 in “Journal of innovative optical health sciences/Journal of innovation in optical health science” Nanoparticles around 600-700 nm can effectively enter and stay in hair follicles for days, which may help in delivering drugs to specific cells.
40 citations
,
July 1989 in “Journal of Cell Science” Rat hair follicles can be kept alive in a lab for 7 days but then stop growing.
36 citations
,
October 1993 in “British Journal of Dermatology” Human hair follicles can grow in a lab for at least 9 days without serum, keeping their natural characteristics.
27 citations
,
March 2022 in “Forensic Toxicology” Micro-segmental hair analysis helps detect drug use patterns and estimate drug consumption days.
25 citations
,
December 2021 in “Journal of Medical Virology” COVID-19 can cause a type of hair loss that usually starts 74 days after infection, affecting mostly women, but most patients eventually recover.
16 citations
,
August 2022 in “Drug Testing and Analysis” Transdermal exposure to certain steroids can be detected in urine for up to 14 days.
13 citations
,
January 1993 in “Archives of dermatological research” Human hair follicles can grow and stay healthy for up to 8 days in a lab setting.
5 citations
,
November 2002 in “Aesthetic Plastic Surgery” Storing hair follicles at -20°C keeps them good for up to 15 days, which may help with hair transplants.
4 citations
,
May 2021 in “medRxiv (Cold Spring Harbor Laboratory)” Long-lasting COVID-19 symptoms like fatigue and breathing difficulties can persist for over 60 days, requiring ongoing care.
4 citations
,
January 2021 in “Cell transplantation” Scientists found the best time to transplant human stem cells for hair growth is between days 16-18 when they have the right markers and growth potential.
1 citations
,
January 2024 in “Journal of Community Medicine & Public Health” Non-hospitalized COVID-19 patients often have lingering symptoms for at least 30 days.
1 citations
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June 2019 in “International Journal of Applied Pharmaceutics” Nanostructured lipid carriers can effectively repair hair split-ends for over 3 days.
September 2025 in “Intisari Sains Medis” The combination therapy improved severe alopecia areata in a patient after 14 days.
February 2025 in “Buletin Veteriner Udayana” Ivermectin and sulfur effectively treated the cat's scabies and sporotrichosis in 14 days.
December 2024 in “Journal of Pharmaceutical Research International” The gel effectively delivers dutasteride for hair loss treatment and remains stable for 90 days.
TrichoSolTM is safe for hair loss treatments with specific ingredient stability for up to 180 days.
December 2023 in “Indian Journal of Canine Practice” A dog's MRSA skin infection was cured with linezolid and fungal treatment in 28 days.
July 2023 in “Journal of lasers in medical sciences” Red laser therapy helped regrow hair in an alopecia areata patient within 21 days.
June 2023 in “Hanguk ingeurie hakoeji” Eating fermented protein made from black bean powder twice a day for 60 days improved hair density but not scalp condition or hair thickness.
April 2022 in “Journal of Cosmetic Dermatology” Trimax-360 Serum, when used for 98 days, safely and effectively improves hair growth, thickness, and density without any side effects.
September 2021 in “Crop research/Crop Research” Aluminum foil packaging kept the biotin nutrition bar with the least bacteria after 30 days.
Candlenut oil nanoemulsion increases hair growth in male rats and remains stable for 14 days at room temperature.
January 2008 in “Anhui nongye kexue” Mongolia sheep hair follicles grew well in a serum-free medium for 19 days.
Keratinocytes grew and migrated into hair follicle areas but disappeared after 15-20 days.
88 citations
,
October 2020 in “Open Forum Infectious Diseases” Some people who recover from COVID-19 continue to have symptoms like fatigue and cough for over 120 days, and some experience hair loss about 59 days after getting sick.
86 citations
,
March 1993 in “Toxicology and Applied Pharmacology” Finasteride affects male rat genitalia development, causing abnormalities during specific pregnancy days.
24 citations
,
November 1997 in “Journal of Biological Chemistry” Mouse high-glycine/tyrosine proteins have distinct patterns in hair follicles, peaking at specific hair cycle days.
11 citations
,
January 2013 in “Methods in molecular biology” The method allows for 3D tracking of hair follicle stem cells and shows they can regenerate hair for up to 180 days.