I found several search results related to retinol skin serums, but none of them specifically mention a product called "Regen Skin Serum Retinol." However, I can provide some general information about retinol serums and their ingredients.

Retinol is a form of vitamin A that is commonly used in skincare products to reduce the appearance of fine lines, wrinkles, and other signs of aging. Retinol serums typically contain other ingredients as well, such as hyaluronic acid, vitamin C, and antioxidants, to help nourish and protect the skin.

Here are some ingredients that are commonly found in retinol serums:

Positive ingredients:

• Retinol: a form of vitamin A that helps reduce the appearance of fine lines and wrinkles.
• Hyaluronic acid: a hydrating ingredient that helps plump and moisturize the skin.
• Vitamin C: an antioxidant that helps brighten and even out skin tone.
• Antioxidants: such as green tea extract, vitamin E, and resveratrol, which help protect the skin from damage caused by free radicals.

Negative ingredients:

• Fragrance: some retinol serums may contain added fragrance, which can irritate the skin.
• Alcohol: some serums may contain alcohol, which can be drying and irritating to the skin.
• Harsh exfoliants: some serums may contain harsh exfoliants, such as physical scrubs or acids, which can be too abrasive for some skin types.

Its important to note that everyones skin is different, and what works well for one person may not work for another. If youre interested in trying a retinol serum, its a good idea to do a patch test first to make sure your skin doesnt have an adverse reaction. Additionally, its always a good idea to consult with a dermatologist or skincare professional before starting a new skincare regimen.