Thank you for your question and for sharing the helpful response from the staff. It seems the staff has already addressed several of your points regarding the suitability of ingredients for the eye area, the availability of Adenosine Complex, and the benefit of PE-1 Aqua.

Based on the information from the staff and the product descriptions:

Eye Cream Formulation Advice

The staff has provided valuable feedback on your formula. Here's a summary and further details to help you refine your eye cream:

1. Should you add Orange Peel Extract and/or Slim-Coffee™ (Caffeine)?

Yes, as the staff mentioned, you can add either or both of these ingredients to your formula if desired.

2. Which is better for dark circles: Orange Peel Extract or Slim-Coffee™ (Caffeine)?

Both Orange Peel Extract (containing Hesperidin Methyl Chalcone) and Caffeine are known to help with dark circles, particularly those related to poor blood circulation and inflammation.

• Orange Peel Extract specifically works by stimulating blood flow around the eyes and has anti-glycation effects, which can help reduce dark circles caused by blood stagnation or inflammation. It can cause a warming sensation upon application due to increased blood flow.
• Caffeine is commonly used in eye products to reduce puffiness and also helps diminish dark circles.

Given that your formula already includes REGU®-AGE and Safe-B3™ (Vitamin B3), which also target dark circles by improving blood circulation and strengthening the skin, adding either Orange Peel Extract or Caffeine can further enhance these effects. The staff suggested adding both at low concentrations if you want to incorporate both benefits.

If you choose to add only one, consider whether addressing puffiness is also a priority (Caffeine is beneficial for this) or if you want to specifically target blood glycation (Orange Peel Extract).

3. How to adjust the formula if adding ingredients?

The staff suggested potentially reducing the percentage of Matrixyl 3000 from 7% to 5%, which is within its recommended usage range (3-5%).

If you decide to add Orange Peel Extract and/or Caffeine, you will need to adjust the percentages of other ingredients to keep the total formula at 100%. The staff recommended using low concentrations if adding both.

• Encapsulated Caffeine is recommended at up to 2% for the eye area.
• Orange Peel Extract is recommended at 1-5%, noting that higher concentrations might cause a warming sensation.

If you add 3% of either Orange Peel Extract or Caffeine as you initially considered, and reduce Matrixyl 3000 by 2% (from 7% to 5%), you would need to reduce the water percentage by 1% to maintain 100%. If you add both Orange Peel Extract and Caffeine at lower percentages (e.g., 1.5% each), you would need to make further adjustments to other ingredients, likely reducing water and potentially other actives as suggested by the staff. Always ensure the total adds up to 100%.

Also, remember the staff's advice that Lift-Now™ is not suitable for the eye area due to the temporary tightening effect which can cause discomfort.

4. Is Adenosine Complex still available?

As confirmed by the staff, Adenosine Complex is temporarily out of stock. The company is awaiting new stock but does not have a confirmed arrival date yet.

5. Will adding PE-1 Aqua improve efficacy?

Yes, the staff confirmed that adding PE-1 Aqua can improve the efficacy of your formula for the eye area. It acts as a penetration enhancer for water-soluble ingredients, helping them absorb better into the skin. The recommended usage rate for eye products is 1.0-2.0%. If you add PE-1 Aqua, you will need to reduce the percentage of other ingredients, most likely water, to keep your formula at 100%.

In summary, you can enhance your eye cream by adding Orange Peel Extract and/or Caffeine at low concentrations (up to 5% for Orange Peel Extract, up to 2% for Encapsulated Caffeine in the eye area), adjusting other ingredients like Matrixyl 3000 and water accordingly. Adding PE-1 Aqua at 1-2% can also improve the delivery of your active ingredients.