Essence Formula for Dry, Dehydrated Skin

Based on your goals for dry, dehydrated skin needing anti-aging properties without a sticky feel before applying carrier oils, your proposed formula is well-suited. The combination of ingredients targets hydration, skin repair, and revitalization. The staff has also confirmed that this formula can be mixed and should not result in a sticky texture, which is important for your routine of applying oils afterward.

Let's look at the key ingredients in your formula:

• Double Hyaluron Liquid: Contains both standard and nano-sized Hyaluronic Acid molecules. This helps provide hydration to both the surface and deeper layers of the skin, addressing dehydration.
• Natto Gum: Extracted from fermented natto beans, it contains Polyglutamic Acid, which is highly effective at moisturizing the skin, even more so than Hyaluronic Acid according to some research.
• Plankton GP4G™ (GP4G EX™): An extract from plankton that research suggests can help stimulate skin cell production and repair DNA damage, contributing to anti-aging effects.
• Repair Activator™ (Bifida Ferment Lysate): Derived from the fermentation of Bifida bacteria, studies have shown it can help repair skin DNA damaged by UVA light and support the skin's natural repair process.
• Galactomyces Ferment Filtrate (Pitera): A fermented ingredient known for its ability to nourish and revitalize the skin, leaving it smooth and hydrated. It is widely used in anti-aging and skin-conditioning products.
• NaturePreserve™ (Gluconolactone & Sodium Benzoate): This is a natural preservative blend that helps protect your water-based formula from microbial growth (bacteria, fungi, yeast), ensuring its safety and shelf life. It is effective within a pH range of 3-6.

The percentages you've chosen for these active ingredients are within typical recommended ranges and should provide noticeable benefits for dry, aging skin.

De-ionized Water and Disodium EDTA

Regarding your de-ionized water that has been opened for a while, boiling it is a good precautionary step to help ensure it is free from microbial contamination before use in your cosmetic formula.

Adding Disodium EDTA is also recommended, as advised by the staff. Disodium EDTA acts as a chelating agent, meaning it binds to metal ions that might be present in the water (even after boiling or from your container). These metal ions can sometimes interfere with the stability and effectiveness of cosmetic ingredients, particularly preservatives. Adding Disodium EDTA helps to prevent these issues, contributing to the overall stability and longevity of your product. A usage rate of 0.1-0.2% is typically recommended for this purpose.

Preservative

Your formula includes NaturePreserve™ at 1%, which is a natural broad-spectrum preservative. This is important for any water-based product to prevent spoilage. The staff's suggestion of Phenoxyethanol SA 1% in a separate reply might have been a general recommendation for a broad-spectrum preservative, but your formula already contains NaturePreserve™ which serves this purpose. NaturePreserve™ is effective and suitable for use in your formula's likely pH range.

Mixing Method

As confirmed by the staff, all the ingredients in your formula can be dissolved directly in the de-ionized water. You do not need to follow a specific order for mixing these water-soluble components. Ensure the water is at an appropriate temperature (below 40°C for ingredients like Plankton GP4G™ and Galactomyces Ferment Filtrate) when adding the heat-sensitive ingredients.

In summary, your formula is well-formulated for your skin concerns and should provide the desired hydration and anti-aging effects without being overly sticky. Adding Disodium EDTA to your water is a beneficial step for stability.