Archive

Author · Joshua Franz

Joshua Franz writes Beauty After Thirty, a cited, one-variable-at-a-time notebook on skincare, makeup, and hair for skin that has been around a while. He reads the ingredient studies so you do not have to, tests things for a month before recommending them, and links every claim to its source.

Makeup Notes

Understanding the Role of Hyaluronic Acid in Tinted Moisturizers

As I explore the intersection of skincare and makeup, particularly in tinted moisturizers, one ingredient frequently stands out: hyaluronic acid. This widely…

Ingredient Notes

Observing the Effects of Single-Ingredient Products on Skin Health

In the world of skincare, it is easy to become overwhelmed by multi-ingredient formulations that promise rapid results. However, I have found…

Ingredient Notes

Decoding Alpha and Beta Hydroxy Acids: My Approach to Exfoliation

Exfoliation is a crucial aspect of maintaining healthy skin, especially as it ages. The process helps to remove dead skin cells and…

Ingredient Notes

Testing Azelaic Acid: Concentrations and Observations Over Eight Weeks

Azelaic acid is a naturally occurring dicarboxylic acid that has garnered attention for its potential benefits in treating a variety of skin…

Ingredient Notes

Peptides in Skincare: Evaluating Their Role and Results on Mature Skin

Peptides have gained attention in skincare for their potential benefits in supporting skin health and appearance, especially for those of us navigating…

Ingredient Notes

Exploring Vitamin C’s Efficacy in Daily Use: A Personal Experiment

Vitamin C, or ascorbic acid, has long held a prominent place in the skincare discourse. Known for its antioxidant properties and potential…

Ingredient Notes

How Niacinamide Supports Aging Skin and What to Expect

Niacinamide, or vitamin B3, is a water-soluble vitamin that has garnered attention in the skincare community for its multifaceted benefits. A growing…

Ingredient Notes

Understanding Retinoids in Skincare and Their Long-Term Effects

The term "retinoids" encompasses a class of compounds related to vitamin A, known for their ability to promote cell turnover and improve…

Skincare Foundations

The Importance of pH in Moisturizers and Its Effect on Skin Health

The pH of a moisturizer is a crucial aspect that often goes overlooked. While many consumers focus on ingredients and formulations, the…