In short
This article discusses various clinical trials investigating the use of lactic acid in skin care and hygiene products. These studies aim to evaluate the efficacy, safety, and potential benefits of lactic acid-containing formulations for different skin conditions and personal care applications. The trials cover a range of products, including moisturizing creams for dry skin in older adults and intimate hygiene products for women.
At a glance
- Main Products Studied
- 12% Ammonium Lactate cream, Dermacyd product line (various formulations)
- Key Conditions
- Xerosis Cutis (dry skin), general hygiene
- Primary Outcomes Measured
- Skin hydration, barrier function, irritation potential, photosensitivity
- Measurement Tools
- SRRC score, Corneometer, Tewameter, ICDRG scale
- Study Durations
- 4-6 weeks typically
- Safety Assessments
- Irritation, contact dermatitis, folliculitis, miliaria, pruritus
- Special Tests
- Photoirritation and photosensitization evaluations
What is Lactic Acid?
Lactic acid is a compound that has been studied extensively for its use in various hygiene products. It's important to note that the lactic acid discussed in these clinical trials is not the same as the lactic acid produced in your muscles during exercise. Instead, it's a specially formulated ingredient used in personal care products.
Uses and Applications
The primary use of lactic acid in the context of these studies is for personal hygiene. It's been incorporated into various products designed for intimate care, including:
- Dermacyd Infantile: A product specifically formulated for infants
- Dermacyd Silver Frutal: A product with a fruity scent
- Dermacyd Silver Floral: A product with a floral scent
- Other variations like Dermacyd PH_DESILSTY_FL and Dermacyd PH_DESILSTY_FR
These products are not intended to treat specific diseases but rather to maintain proper hygiene and potentially promote overall intimate health.
Safety and Acceptability
A significant focus of the clinical trials was to evaluate the safety and acceptability of lactic acid-based products. The studies aimed to demonstrate:
- Absence of irritation
- Good acceptability by users
- Lack of primary and accumulated dermic irritability (skin irritation over time)
- Absence of allergic potential (sensitization)
Researchers used specific scales to measure the intensity of any reactions, ensuring the products were safe for regular use.
Photo Evaluation Studies
Several studies focused on the photo-related effects of lactic acid products. These evaluations aimed to ensure that the products wouldn't cause adverse reactions when the skin was exposed to light, particularly UV radiation. The studies examined:
- Photo-irritation potential: Whether the product causes skin irritation when exposed to light
- Photosensitization potential: Whether the product makes the skin more sensitive to light
These tests used UVA irradiation and evaluated results according to the International Contact Dermatitis Research Group (ICDRG) scale. They also considered the individual's skin type in assessing sensitivity.
Application Methods
The lactic acid products were typically applied in one of two ways:
- Like a curative: This means the product was applied directly to the skin, similar to how you might apply a lotion or ointment
- Normal conditions of use: This likely refers to using the product as directed, such as during regular bathing or hygiene routines
Duration of Treatment
The duration of treatment varied across studies, but common timeframes included:
- 21 consecutive days: Often used for acceptability studies
- 5 weeks: Typically used for photo-evaluation studies
- 6 weeks: Used in some compatibility studies
Product Variations
The clinical trials examined several variations of lactic acid-based products, each potentially tailored for different uses or preferences:
- Dermacyd Infantile: Specifically designed for infants
- Dermacyd Silver Frutal: A fruity-scented version
- Dermacyd Silver Floral: A floral-scented version
- Dermacyd PH_DESILSTY_FL: Another floral variant
- Dermacyd PH_DESILSTY_FR: Another fruity variant
These variations suggest that while the core ingredient (lactic acid) remains the same, the products are formulated to cater to different preferences and age groups, from infants to adults.