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GlossaryDiffusion Coefficient

measure of how quickly particles spread in a medium

The diffusion coefficient, also known as diffusivity, is a measure of how quickly molecules or particles spread out over time in a given medium, such as air, water, or within biological tissues. It quantifies the rate at which substances move from areas of high concentration to areas of low concentration, and is influenced by factors like temperature, medium viscosity, and the size of the diffusing particles.

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research Preparation, Optimization, In Vitro Evaluation and Ex Vivo Permeation Studies of Finasteride Loaded Gel Formulations Prepared Using Response Surface Methodology

3 citations , September 2018 in “Current Drug Delivery”

The combination of propylene glycol and Tween® 80 improves finasteride gel effectiveness.

research Kinetics and Equilibrium of Solute Diffusion into Human Hair

8 citations , July 2012 in “Annals of biomedical engineering”

Hair absorbs molecules differently based on their size, charge, and love for water, and less at higher pH; this can help make better hair products.

research Skin Permeation of Curcumin Nanocrystals: Effect of Particle Size, Delivery Vehicles, and Permeation Enhancer

15 citations , February 2023 in “Colloids and surfaces. B, Biointerfaces”

Smaller curcumin nanocrystals penetrate skin better, but additives and particle size affect absorption and accumulation.

research Investigation of In Vitro and In Vivo Skin Permeability Using Laser Scanning Microscopy

January 2022 in “OPAL (Open@LaTrobe) (La Trobe University)”

Nanoparticles in sunscreen are generally safe as they stay on the skin's surface.

Development of a Two-Dimensional Model for Predicting Transdermal Permeation with the Follicular Pathway: Demonstration with a Caffeine Study

research Development of a Two-Dimensional Model for Predicting Transdermal Permeation with the Follicular Pathway: Demonstration with a Caffeine Study

35 citations , June 2017 in “Pharmaceutical research”

Researchers developed a model that shows hair follicles increase skin absorption of caffeine by 20%.

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community If apply topical fin goes systemic then does it matter where I apply it on the scalp?

in Finasteride/Dutasteride 10 upvotes 1 year ago

The conversation is about whether topical finasteride and minoxidil need to be applied directly to the affected areas of the scalp or if they can be spread through blood vessels. It also asks how long topical finasteride remains on a pillow.

community A doctor says to NEVER massage Minoxidil

in Minoxidil 11 upvotes 5 years ago

A user is concerned about the best method to apply Minoxidil for hair loss, noting conflicting advice from doctors. Another user mentions that not massaging the liquid can cause it to drip, suggesting slight spreading with fingers.

community Peptides that Stop Hair Loss? | In-depth Literature Review Video

in Research/Science 74 upvotes 1 year ago

Peptides like TB500, KPV, GHK-CU, and BPC-157 are overhyped for hair growth with limited proven effectiveness in humans. Combining peptides with delivery methods like iontophoresis and sonophoresis shows promise, but many claims remain unproven.

community Where to find Botox online

in Treatment 6 upvotes 5 years ago

The user is looking for a place to buy genuine Botox online for scalp use. They are seeking recommendations for reliable sources.

community One-sided diffuse thinning - what should I do?

Aran in General 101 upvotes 3 months ago

The user is experiencing one-sided diffuse thinning and has been using finasteride and liquid minoxidil for 4-5 years with minimal results. They are considering whether to save for a hair transplant or address scalp sensitivity and irritation first.

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