{"id":19124,"date":"2026-06-17T14:58:58","date_gmt":"2026-06-17T07:58:58","guid":{"rendered":"https:\/\/www.tibdglobal.com\/product\/essence-stability\/"},"modified":"2026-10-06T13:37:21","modified_gmt":"2026-10-06T06:37:21","slug":"toner-stability-testing","status":"publish","type":"product","link":"https:\/\/www.tibdglobal.com\/en\/product\/toner-stability-testing\/","title":{"rendered":"Toner, Essence and Hydrating Toner Stability Testing Service"},"content":{"rendered":"
[vc_section][vc_row][vc_column][vc_column_text css=”” woodmart_inline=”no” text_larger=”no”]\r\n

Toners, essences, and hydrating toners (\u0e19\u0e49\u0e33\u0e15\u0e1a) are among the most popular product categories in the Thai cosmetics market, driven by K-Beauty and J-Beauty routines that have made multi-step skincare a mainstream consumer practice. These products, which are high-water-content and frequently contain high concentrations of active ingredients such as Vitamin C, Niacinamide, Hyaluronic Acid, Retinol, and Peptides, face specific stability challenges that differ from cream or lotion products.<\/p>\r\n

The hot and humid conditions of Thailand and the ASEAN region, classified as ASEAN Zone IVb (30\u00b0C \/ 75% RH long-term), accelerate the oxidation and degradation of active ingredients, alter the pH balance, and promote microbial growth in water-based formulations. These conditions make comprehensive stability testing not just a regulatory requirement but a quality assurance necessity for products claiming active ingredient benefits.<\/p>\r\n

TIBD’s service covers stability protocol design, active ingredient assay by High Performance Liquid Chromatography (HPLC) and advanced analytical methods, Preservative Efficacy Testing (PET) per ISO 11930, microbial limit testing per ISO 17516, and physical parameter assessment, in partnership with VISBIO as an Independent Quality Assurance Verifier (IQAV) using Validated Methods per ICH Q2(R1), to produce a stability report supporting Thai FDA Cosmetic Notification, export market submissions, and Product Information File (PIF) preparation.<\/p>\r\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]\n\t\t

\n\t\t\t\n\t\t\t
\n\t\t\t\t

<\/span>Toner, Essence and Hydrating Toner in the Thai Cosmetics Market<\/span><\/h4>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\n\t\t[vc_column_text css=”” woodmart_inline=”no” text_larger=”no”]\r\n

These three product types are related in their high-water-content format but serve distinct functions in the skincare routine and require different stability considerations.<\/p>\r\n\r\n

    \r\n \t
  • Traditional Astringent Toner was the original format, with a water and alcohol base designed to remove residual cleanser, tighten pores, and prepare skin for subsequent steps. This format generally has simpler stability requirements due to its high alcohol content providing inherent antimicrobial protection, but must still be assessed for pH stability and fragrance degradation.<\/li>\r\n \t
  • Hydrating Toner or \u0e19\u0e49\u0e33\u0e15\u0e1a is the format popularized through K-Beauty routines. It is a water-rich, low- or no-alcohol product applied in multiple layers (the 7-Skin Method) to deliver deep hydration. This format typically contains Hyaluronic Acid, Glycerin, Panthenol, and botanical extracts. Without alcohol as a preservative, the microbial challenge is more significant, and PET per ISO 11930 is essential.<\/li>\r\n \t
  • Essence is a more concentrated format positioned between toner and serum, often containing higher concentrations of targeted active ingredients such as Vitamin C (10 to 20%), Niacinamide (5 to 10%), Retinol, Peptides, or Ferment Filtrates. The high active ingredient concentration creates complex stability challenges across pH, oxidation, and ingredient-ingredient interactions that require active ingredient assay testing at multiple Pull Points throughout the study.<\/li>\r\n<\/ul>\r\n[\/vc_column_text][vc_single_image image=”18951″ img_size=”full” alignment=”center” css=”” parallax_scroll=”no” woodmart_inline=”no”][\/vc_column][\/vc_row][vc_row][vc_column]\n\t\t
    \n\t\t\t\n\t\t\t
    \n\t\t\t\t

    <\/span>Challenges of High-Concentration Active Liquid Systems<\/span><\/h4>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\n\t\t[vc_column_text css=”” woodmart_inline=”no” text_larger=”no”]\r\n

    Four specific challenges arise in stability testing of toners and essences that do not commonly occur in emulsion-based products.<\/p>\r\n\r\n

      \r\n \t
    1. The first is Vitamin C oxidation. Pure L-Ascorbic Acid (Vitamin C) at effective concentrations (typically 10 to 20%) requires a pH of 3.0 to 3.5 to maintain stability. At higher pH values, it oxidizes rapidly to Dehydroascorbic Acid, which is then further degraded to inactive compounds. Color change from clear or pale yellow to orange or brown is the first visual indicator of significant Vitamin C degradation.<\/li>\r\n \t
    2. The second is preservative system stability in a challenging pH environment. Products formulated at pH 3.0 to 3.5 for Vitamin C stability present a challenge for broad-spectrum preservative systems, as many preservatives have reduced efficacy at low pH or are restricted in concentration under regulatory frameworks. PET per ISO 11930 must be conducted under the same pH and formula conditions as the final product.<\/li>\r\n \t
    3. The third is pH change over time. The pH of water-based formulations can shift during storage due to CO2 absorption from the environment, degradation of acidic active ingredients, or reaction between formula components. A pH change of more than 0.5 units from the initial value is typically considered a significant change in cosmetic stability assessment.<\/li>\r\n \t
    4. The fourth is component separation or turbidity. Essences containing botanical extracts, high molecular weight Hyaluronic Acid, or poorly soluble compounds may develop turbidity or sedimentation over time, particularly at refrigerated storage conditions or following temperature cycling tests.<\/li>\r\n<\/ol>\r\n[\/vc_column_text][\/vc_column][\/vc_row][vc_row][vc_column]\n\t\t
      \n\t\t\t\n\t\t\t
      \n\t\t\t\t

      <\/span>Specific Testing Parameters for Toners and Essences<\/span><\/h4>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\n\t\t[vc_column_text css=”” woodmart_inline=”no” text_larger=”no”]\r\n

      TIBD’s stability testing for toners and essences covers parameters designed to capture both physical stability and active ingredient integrity.<\/p>\r\n\r\n