Effectiveness of collagen peptides in the treatment of age-related skin changes

Collagen is the main structural protein that provides skin elasticity. As we age, its production decreases, leading to the appearance of wrinkles. A review published by Dr. Liji Thomas summarizes the evidence on whether popular supplements actually work. Skin aging is influenced by two types of factors:

1. Internal factors: the natural decline in the activity of fibroblasts (cells that produce collagen) and the disruption of extracellular matrix metabolism.
2. External factors (photoaging): damage caused by ultraviolet radiation, which leads to thickening and shortening of collagen fibers, as well as activation of matrix metalloproteinases (MMPs), enzymes that destroy the matrix.

Many cosmetic products contain whole collagen, but its molecules are too large to penetrate the skin’s protective barrier (epidermis). Modern research has shifted its focus to collagen peptides, which are fragments of protein that have been broken down by enzymes. Due to their low molecular weight, they are easier for the body to absorb when consumed orally.

To illustrate which route of administration is scientifically supported, the following is a comparison table. It helps to understand why buying an expensive cream may be less effective than taking capsules or powder. Unlike whole collagen, peptides have a low molecular weight, which ensures their high bioavailability.

The study revealed an important pattern in the dosage of the drug. A clinically significant result is observed when 2.5 to 5 grams of collagen peptides are taken per day.

This fact is explained by the physiological limit of absorption: exceeding the dose of 5 grams does not lead to accelerated skin regeneration. The body simply cannot use an excessive amount of amino acids to synthesize specific protein in the dermis. Therefore, consuming large portions of the supplement is not economically feasible.

Despite the overall positive findings, scientists urge caution. It is important to note that collagen derived from fish or seafood can cause severe reactions in sensitive individuals. Marine-based products may contain traces of heavy metals (such as mercury or lead), which requires strict monitoring by manufacturers. Currently, there are limited large-scale studies that have confirmed the complete safety of continuous collagen intake over several years.

However, scientific evidence suggests that ingesting collagen peptides can slow down the visual aging of the skin by stimulating the body’s internal resources. However, this is not a magic pill: the effect depends on the quality of the raw materials, the regularity of intake, and the absence of negative factors such as smoking and excessive UV exposure.