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Related Concept Videos

Physiological Barriers01:25

Physiological Barriers

Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
The blood endothelial barrier is the most porous of these. It allows all small ionized, un-ionized, and lipophilic molecules to pass through the endothelial lining into the interstitial space...
Factors Affecting Drug Distribution: Physiological Barriers01:23

Factors Affecting Drug Distribution: Physiological Barriers

Drug distribution in the body is intricately regulated by various physiological barriers that control the passage of substances. These include the capillary endothelial barrier, the blood-brain, blood-cerebrospinal fluid, blood-placental, and blood-testis barriers.
The capillary endothelial barrier allows only smaller molecules below 600 Da (Daltons) to pass through. It also restricts drugs like heparin that are bound to blood components, limiting their movement within the bloodstream.
The...
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...
The Blood-brain Barrier00:49

The Blood-brain Barrier

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Related Experiment Video

Updated: Jul 5, 2026

Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery
09:44

Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery

Published on: September 26, 2025

Caffeine improves barrier function in male skin.

J M Brandner1, M J Behne, B Huesing

  • 1Department of Dermatology and Venerology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany. brandner@uke.uni-hamburg.de

International Journal of Cosmetic Science
|May 21, 2008
PubMed
Summary
This summary is machine-generated.

Caffeine improves male skin barrier function by inhibiting phosphodiesterase, counteracting testosterone

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Area of Science:

  • Dermatology
  • Biochemistry
  • Cosmetic Science

Background:

  • Androgens like testosterone and dihydrotestosterone negatively impact male skin barrier function and hair viability.
  • Dihydrotestosterone acts as an adenyl cyclase inhibitor, while caffeine functions as a phosphodiesterase inhibitor.
  • Caffeine is a common cosmetic ingredient with potential to counteract androgen effects.

Purpose of the Study:

  • To investigate if caffeine can overcome testosterone-induced negative effects on epidermal barrier function.
  • To assess caffeine's impact on transepidermal water loss (TEWL) in male and female skin.

Main Methods:

  • A double-blind, placebo-controlled study involving healthy male and female volunteers.
  • Application of 0.5% caffeine in hydroxyethylcellulose gel (HEC) to one forearm and HEC alone to the other.
  • Measurement of TEWL before and after a 7-day treatment period.

Main Results:

  • Basal TEWL showed no significant difference between sexes.
  • Caffeine application significantly reduced TEWL in male skin compared to female skin.
  • Caffeine demonstrated a beneficial effect on barrier function specifically in male subjects.

Conclusions:

  • Caffeine effectively counteracts the detrimental effects of androgens on male skin barrier function.
  • Topical caffeine application can improve epidermal permeability barrier repair capacity in men.
  • Caffeine is a beneficial ingredient for enhancing male skin barrier health.