Both are very inexpensive, which is what I am looking for, but not sure which one I should choose. I am also concerned about stability of the active ingredients in the bottle used. Can you provide any advice?
The chief difference between Neutrogena Healthy Skin and Neutrogena Ageless Intensives Deep Wrinkle is the former contains traditional retinol, whereas the latter has a new form of retinol called retinol SA.
Why Retinol SA is Better than Traditional Retinol
Retinol SA is perhaps the skin care and cosmetics industry’s first foray into a water-in-oil retinoid emulsion. This may not sound exciting, but it is. Retinol is one of the more unstable ingredients in skin care products. Even retinol in traditional “stable” oil-in-water emulsions only have a stability of about 60% after 13 weeks! For you science buffs out there, it is known the process involves some forms of oxidation and isomerization reactions, and worsens after prolonged exposure to light or air.
Retinol in water-in-oil emulsions before Ageless Intensives was even more chemically unstable than oil-in-water emulsions. Exactly why involves a myriad of reasons that are not completely understood. Despite this, the brilliant scientists at Johnson & Johnson figured out a way to use chelating agents to stabilize the retinol. Normally, metal ions rip electrons off of retinol, causing it to degrade and lose efficacy. However, chelating agents seize metal ions before they get the chance. Think of chelating agents like the police arresting obnoxious wedding crashers – they stop the uninvited before they can wreck matters up! Or see my silly cartoon below:
The chelating agent allows retinol to be active in a water-in-oil emulsion for the first time. The advantage of having the retinol in the water-in-oil emulsion rather than the oil-in-water is that it can be combined with other ingredients for a slow, sustained release throughout the day (and night).
So is it necessary to use products only containing retinol SA?
No. While Neutrogena’s retinol SA has a unique time-release formulation, we still don’t know how the maximum concentration of retinol SA available compares to the final effects of 0.025%, 0.5%, 1.0%, and 1.5% strengths of ordinary retinol – all of which are available on the market today. There needs to be a published study directly comparing the efficacy of retinol SA to different strengths of retinol. Neutrogena says retinol SA in its formulations is more potent than “retinol,” but we don’t know at what strength retinol. We also don’t know what the maximum concentration of retinol SA is!
Further, as exciting as retinol SA is, the effects are similar to what we see in studies with 0.5-1.0% regular retinol. For instance, Neutrogena reports after two weeks of use of Ageless Intensives Deep Wrinkle, women had improvements in skin softness, smoothness, fine lines, age spots, and deep wrinkles. Yet these are identical symptoms to what is seen with 0.5% regular retinol (Clinics in Dermatology, 2001).
How do retinol and retinol SA measure up to retinyl palmitate?
Neutrogena reports retinol SA is more potent than retinol, and retinol is 20 times stronger than retinyl palmitate (Clinics in Dermatology, 2001). This is because retinyl palmitate is attached to palmitic acid, and must be processed in the skin more than retinol.
How strong do you guess Ageless Intensives to be?
After using the product, I would estimate the “maximum strength retinol SA” in Ageless Intensives is stronger than the [approximate] 0.025% retinol available in Healthy Skin and weaker than the 0.5% retinol available in Skinceuticals 0.5.
Neutrogena Ageless Intensives contains technology that could revolutionize the over-the-counter retinoids market, with the world’s first proven stable water-in-oil retinoid formulation and subsequent sustained time release. Unfortunately, Johnson & Johnson owns the patent for this technology, and it is unlikely the pharmaceutical giant will risk using much higher concentrations of retinol SA, as retinol runs a high risk of initial redness, irritation, peeling, and the like. So it will probably be another 15-20 years before we have an extremely potent time-release over-the-counter retinoid. (!) At any rate, I estimate the efficacy of Neutrogena Ageless Intensives to be somewhat higher than Healthy Skin, but less mighty than Skinceuticals 0.5. I love the technology, and if you’re looking for a gentle retinol formula, Neutrogena Ageless Intensives is a great way to go.
Ingredients in Neutrogena Healthy Skin Night Cream
Water, C12 15 Alkyl Benzoate, Glycerin, Cetearyl Alcohol, Ethylhexyl Hydroxystearate, Dimethicone, Camellia Oleifera (Green Tea) Leaf Extract, Retinol, Panthenol, Disodium EDTA, Tocopherol, Cetearyl Glucoside, Tocopheryl Acetate, Polysorbate 20, Triethanolamine, Methylparaben, Propylparaben, Butylene Glycol, Diazolidinyl Urea, BHT, Carbomer
Ingredients in Neutrogena Ageless Intensives Deep Wrinkle Night Cream
Water, PPG 2 Myristyl Ether Propionate, Cetearyl Alcohol, Cetyl Dimethicone, Pentaerythrityl Tetraethylhexanoate, Hexadecyl Stearate, Caprylyl Methicone, Dimethicone, Behenyl Alcohol, Ethylhexylglycerin, Squalane, Glycerin, Shea Butter (Butyrospermum Parkii), BHT, Panthenol, Allantoin, Arginine, Erythorbic Acid, Tocopherol, Retinol, Polysorbate 20, Sodium Hyaluronate, Dipotassium Glycyrrhizate, Bisabolol, C13 14 Isoparaffin, Laureth 7, Cetearyl Glucoside, Glyceryl Stearate, PEG 100 Stearate, Polyacrylamide, Nylon 12, Disodium EDTA, Propylparaben, Ethylparaben, Methylparaben
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