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The collagen molecules used in skin-care products are too large to effectively penetrate the skin barrier and stimulate collagen synthesis.

The lightweight texture absorbs instantly, but I like to really slather it on and let it sit like a mini mask for a few minutes before gently rubbing any excess into my neck and décolletage.

Fortunately, collagen creams can work to firm and rejuvenate skin if (and only if) topical collagen is joined by ingredients that have been scientifically proven to enhance collagen production, as Dr.

Desai mentioned earlier.