Though a slowdown in collagen production is natural as we age, it's often the root cause of visible fine lines and wrinkles. Continual sun exposure, environmental aggressors, and poor diet are a few other factors that contribute to this loss of elasticity over time. But according to New York-based dermatologist Dr. Marina Peredo, applying a collagen peptide cream regularly can help restimulate collagen growth, in turn improving the appearance of pigmentation, texture, and sagginess.

As an added bonus, you won't have to pay more than $15 to find one that really works. Thousands of Amazon shoppers have left the NatureWell Collagen Intense Moisture Cream glowing ratings thanks to its ability to transform a number of skin concerns on the face and body. These include stubborn acne scars, dry "alligator" skin, fine lines, sun damage, and stretch marks.

According to Dr. Peredo, this multipurpose cream is formulated with many key antioxidants that bring an influx of benefits. "Vitamin A is a retinoid which is most commonly used for its anti-aging properties. Vitamin C also works to boost collagen and elastin to slow signs of aging, while vitamin E reduces inflammation in the skin," she tells InStyle. With continued use, you should begin to see an improvement in overall skin hydration and tone within the first month.

Shop now: $15; amazon.com

Multiple reviewers said they're "stunned" by the difference the cream has had on their skin, leading some shoppers to immediately stock up on multiple tubs.

"I'm 64, [and have] been using this cream for around three weeks," wrote one customer. "My skin has never been this soft and luminous. I'm not one to review things often, but I highly recommend this moisturizer — it's not at all greasy, but skin stays moisturized all day. And it's not overpriced like the tiny jars of wrinkle cream that don't even work. Love this stuff!

"This moisturizer is AMAZING," shared another. "I'm 41 years old and I've been using it for almost a year now. I started seeing 11's wrinkles between my eyes, and a few forehead wrinkles. As soon as I applied it, they pretty much disappeared. I can't say enough good about this product. Just buy it, you'll see what I mean. AMAZING!"

The verdict is in: This anti-aging cream is one of Amazon's best-kept secrets. Snag a tub for just $15 right now.