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Research

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research Patch tests with commercial hair dye products in patients with allergic contact dermatitis to para-phenylenediamine

6 citations , January 2016 in “Indian Journal of Dermatology Venereology and Leprology”

This study found that the majority of "hypoallergenic" hair dyes still triggered allergic reactions in patients sensitive to para-phenylenediamine.

research 55 cases of allergic reactions to hair dye: a descriptive, consumer complaint‐based study

98 citations , November 2002 in “Contact Dermatitis”

This study found that adverse reactions to para-phenylenediamine in hair dye, including severe allergic contact dermatitis, may be more common than currently reported and often misdiagnosed.

research Patterns of Sensitization and Cross-Reactivity in Hair Dye Allergy: An 18-Year Tertiary-Center Experience from Greece.

February 2026 in “PubMed”

This study reported that para-phenylenediamine and toluene-2,5-diamine are the main sensitizers in hair dye-related allergic contact dermatitis, with significant cross-reactivity to several other compounds.

research Association of hair dye use with circulating levels of sex hormones in premenopausal Japanese women

6 citations , March 2015 in “European Journal of Public Health”

This study suggests that long-term use of hair dyes may be associated with higher testosterone levels among premenopausal Japanese women.

research Effect of cosmetic hair treatment and natural hair colour on hair testosterone concentrations

1 citations , October 2023 in “PloS one”

This study found that testosterone concentrations in hair samples were moderately stable over three months, with cosmetic treatments like coloring increasing testosterone levels, while natural hair color in untreated hair did not affect testosterone measurements.

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Community Join

5 / 1000+ results

community 200 days on dut + min, what do you think?

599 upvotes 11 months ago

The user reports significant hair regrowth after 200 days using dutasteride and minoxidil, attributing changes to hair dye. Others doubt the authenticity and discuss treatment effectiveness and side effects.

community Yo!! One year update chooms!!!!

in Progress Pictures 2858 upvotes 1 year ago

Significant hair regrowth was achieved using 0.5mg oral finasteride, a topical mix of finasteride and minoxidil, and dermastamping. Initial side effects like achy testicles were managed by adjusting the regimen.

community 2 months back on Fin/Min after stopping treatment for 2 years. First pic is a bit deceptive because I had a 1mm buzzcut and lighting right above me, but it's definitely filling back in.

in Progress Pictures 406 upvotes 2 years ago

A user shared progress pictures showing significant hair regrowth after two months back on finasteride and minoxidil, following a two-year break. The user also mentioned experimenting with hair dye and considering growing their hair for an undercut.

community 6 month 0.5 fin and nanoxidil update

1582 upvotes 1 year ago

The user reported positive hair regrowth results after six months of using 0.5 mg finasteride and nanoxidil, despite experiencing initial side effects like testicular pain and changes in libido. They noted that nanoxidil was chosen over minoxidil due to less scalp irritation.

community How biotin benefited you? Could it strengthen hair?

in Product 6 upvotes 1 year ago

Biotin may strengthen existing hair and reduce hair loss, but it doesn't promote new hair growth. Some users report stronger, darker hair, while others see no benefits or experience acne.

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Learn

2 / 801 results

learn Hair Transplant

Can I dye my hair after a hair transplant? Wait 4-6 weeks before dyeing your hair after a hair transplant.
Can I style or care for my transplanted beard after the hair transplant? You can style and care for your transplanted beard like natural hair after it heals.
When can I cut or style my hair after a hair transplant? You can cut or style your hair about 1 month after a hair transplant.
All 4 questions on Hair Transplant →

learn Scalp Micropigmentation

Can I still color or style my hair after scalp micropigmentation? You can color and style your hair after scalp micropigmentation once fully healed.

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Clinics

6 / 13 results

All 13 clinic results →

Experts

1 / 5 results

Unscored
SMP Specialist
Hairo Fallas
Newark, NJ, United States

Hairo Fallas