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GlossaryHumidity

amount of water vapor in the air

Humidity refers to the amount of water vapor present in the air. It can significantly affect hair and skin; high humidity can cause hair to become frizzy and skin to feel sticky, while low humidity can lead to dryness. For professionals, understanding humidity is crucial in fields like meteorology, HVAC, and even dermatology, as it influences environmental conditions and human comfort.

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Research

5 / 1000+ results

research Discrete Nanoscale Distribution of Hair Lipids Fails to Provide Humidity Resistance

15 citations , August 2020 in “Analytical chemistry”

Hair lipids do not protect against humidity.

research Evaluation of hair humidity resistance/moisturization from hair elasticity.

4 citations , October 2007 in “PubMed”

Polyquaternium-70 shampoo is best for reducing frizz.

research EXPRESS: Structure Evolution in Hair Fibres During Strain and the Effect of Relative Humidity

May 2026 in “Applied Spectroscopy”

Humidity affects hair structure changes during stretching.

research Improved Humidity-Resistant Hair Straightening Using a Cysteamine-Derived Amino Acid Compound

July 2026 in “Preprints.org”

A cysteamine-derived compound helps hair stay straight in high humidity.

research The effect of relative humidity on the spreading of ethanol on human hair fibers

1 citations , December 1972 in “Journal of Colloid and Interface Science”

Ethanol spreads well on hair at low humidity but less so at higher humidity due to water condensation.

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Community Join

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community 9 month update 1st slide 2020 at my worst vs today. 2nd slide 9 months ago vs today. 3rd, wet hair. 4th, hairline. 5th, damp hair. 6th crown view. 7th, brushed back. 8 & 9, hair in high Summer humidity. 10th, no lighting.

in Progress Pictures 342 upvotes 2 years ago

User shared 9-month hair regrowth progress using a Fin/Min spray from HIMS, with additional microneedling. Other users praised the results and discussed the effectiveness of topical treatments.

community I bought 150€ worth of Avodart for nothing

in Finasteride/Dutasteride 18 upvotes 1 year ago

Dutasteride capsules were exposed to heat and humidity, causing them to soften, and the user considered replacing them with new ones from a local pharmacy. Suggestions included alternating between old and new capsules, storing them properly, and using them topically with Minoxidil, though the user decided to wait and see the effects of Dutasteride first.

community Why does hairloss look great one day and regression the next?

in Chat 49 upvotes 5 months ago

Hair appearance fluctuates due to factors like styling, product buildup, and humidity, causing frustration for those with diffuse thinning. Treatments mentioned include minoxidil, finasteride, ketoconazole shampoo, and RU58841, with mixed results.

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