Information about Vitamin C (L-ascorbic acid) (Ultra-Fine)

Here is the information regarding your questions about Vitamin C (L-ascorbic acid) (Ultra-Fine):

1. Origin or Synthesis: L-ascorbic acid is typically produced through synthesis. While the description for the Ultra-Fine grade doesn't specify the exact origin or synthesis method, the Standard grade of L-ascorbic acid is noted as being sourced from China as a budget option.

2. Incompatibility and Usage Restrictions: L-ascorbic acid (Ultra-Fine) should not be mixed directly with water as it can lead to oxidation and degradation. When formulating with water, it is essential to include a chelating agent like Disodium EDTA to bind metal ions (such as Iron, Copper, and Nickel Salts) that can destroy L-ascorbic acid. To further protect Vitamin C from deterioration, especially from oxidation and UV light, it is recommended to use stabilizers like Protec™ OX and Protec™ UV in the formula.

3. Burning Sensation on the Face: The warming or burning sensation you feel when using Vitamin C (L-ascorbic acid) is likely due to its acidic nature. L-ascorbic acid is most effective at a low pH, typically between 2.0 and 4.0 (with the FDA requiring a minimum pH of 3.5 for cosmetics applied to the skin). This low pH can cause a tingling or stinging sensation, particularly at higher concentrations (usage rates are typically 3-15%). If the sensation is mild and temporary, it might be normal, especially when your skin is adjusting. However, if the burning is severe, persistent, or accompanied by redness or irritation, you should consider reducing the concentration of Vitamin C in your formula or stopping use. It's important to listen to your skin.

4. Usage During Pregnancy or Breastfeeding: The product description does not contain information regarding the safety of using Vitamin C (L-ascorbic acid) during pregnancy or breastfeeding. For advice on using cosmetic ingredients during these periods, it is best to consult with a healthcare professional or your doctor.