What is collagen? Collagen is the most abundant protein in the human body, accounting for roughly 30% of total protein mass. It serves as the primary structural component of skin, muscles, bones, tendons, ligaments, and other connective tissues. Collagen is also found in organs, blood vessels, and the intestinal lining, where it plays a vital role in maintaining structural integrity, hydration, and elasticity.
To date, researchers have identified at least 28 types of collagen, each characterized by distinct differences in amino acid composition, structural configuration, and interactions with other molecules. These structural differences are often influenced by nutrients such as vitamin C, zinc, copper, and manganese, which support the formation of collagen’s signature triple-helix shape.
Collagen supplements provide the body with key amino acids and bioactive peptides that may help stimulate natural collagen production. These peptides act as signaling molecules that support the ongoing maintenance of tissues, including skin, nails, joints, and bones.
For brand owners developing collagen products, it’s important to highlight that collagen supplements offer functional protein, particularly beneficial when protein intake is low. Inadequate protein consumption is associated with visible signs of aging, such as thinning hair, brittle nails, and reduced mobility—all areas where collagen-based formulations may offer support.
The human body relies on about 20 different amino acids, and collagen supplements with a diverse amino acid profile are often preferred. Selecting a collagen source that delivers the right type and peptide profile can help support the body’s ability to maintain a resilient and youthful appearance over time.
As one of the leading contract manufacturers of collagen supplements, we prioritize clean, traceable, and ethically sourced raw materials. Our collagen sources include:
Because collagen powders are a premium ingredient in the nutraceutical space, they are sometimes vulnerable to adulteration. For this reason, robust quality control measures, including identity testing and supply chain transparency, are critical to ensure product integrity and brand trust.
As the body ages, collagen production naturally declines. In women, this decrease can be especially pronounced – up to 30% of skin collagen may be lost within the first five years of menopause. This loss contributes to visible signs of aging such as fine lines, wrinkles, and reduced skin elasticity.
Several lifestyle and environmental factors can accelerate this decline, including:
With age, collagen fibers in the deeper layers of the skin become less structured, transitioning from a dense, organized network into a looser, more fragmented matrix. External stressors further degrade these fibers, diminishing their thickness and resilience, which contributes to the appearance of aging on the skin’s surface.
Collagen supplements are widely used to support skin health, joint comfort, bone density, hair and nail strength, and muscle tone. Below is an overview of the key areas where collagen supplementation may offer value:
Skin – The results of numerous studies have shown that type I bovine collagen peptides may help reduce the appearance of fine lines and wrinkles while improving skin elasticity and hydration. Similar benefits have also been observed with type II collagen from chicken sternal cartilage and collagen sourced from unhydrolyzed eggshell membrane (rich in type I, V, and X). The best type of collagen for skin is generally considered to be type I, though type II may also provide supportive effects.
Joints – Type II collagen, particularly from chicken sternal cartilage, has been shown to promote joint comfort and support mobility. Collagen from eggshell membrane has also demonstrated benefits for functional joint capacity. While type II is best known for joint support, some studies suggest type I may offer complementary benefits.
Bone – In postmenopausal women, supplementation with type I and III bovine collagen peptides has been associated with improvements in bone mineral density, suggesting a role in maintaining bone strength as part of a broader nutritional approach.
Hair and Nails – Supplementation with type I collagen peptides has been linked to increased hair thickness and follicle activity. Additional research on eggshell membrane collagen (rich in types I, V, and X) reported improvements in hair texture and nail strength. The best type of collagen for hair is widely considered to be type I, given its structural role in supporting hair growth and resilience.
Muscle – A combination of type I and III collagen peptides, when paired with resistance training, has been shown to improve body composition by increasing fat-free mass, muscle strength, and lean body mass more effectively than exercise alone.
Women – For many female consumers, collagen offers a multi-benefit approach. Type I collagen, in particular, supports skin, hair, and nail appearance, making it the most relevant form when considering collagen benefits for women across various stages of life.
Although approximately 28 types of collagen have been identified in the human body, only a few are commonly used in dietary supplements – primarily types I, II, and III. Below is an overview of the most relevant collagen types and their functions.
Type I collagen is the most abundant form in the human body, comprising up to 90% of total collagen. It is a key structural protein found in skin, bones, tendons, ligaments, and major organs. Type I collagen supports tissue strength and integrity, playing a central role in maintaining skin elasticity and hydration. It also contributes to hair and nail strength, bone health, and the wound healing process.
Type II collagen is primarily located in cartilage and plays a central role in maintaining its structural integrity. It also exists in the intervertebral discs, the vitreous humor of the eye, the inner ear, and the nasal septum. This collagen type provides tensile strength and resistance to compressive forces within joints, while also supporting the environment required for healthy cartilage cells.
Type III collagen is a fibrillar collagen often found alongside type I. It is highly concentrated in tissues requiring elasticity and structural flexibility, such as the skin, lungs, blood vessels, and intestinal walls. It supports organ structure and vascular function. Mutations or deficiencies in type III collagen have been linked to certain connective tissue conditions.
Unlike the fibrillar structure of other types, type IV collagen forms a sheet-like matrix that serves as a foundational element of basement membranes. These membranes separate and support layers of cells in tissues such as the skin and kidneys. Type IV collagen plays a vital role in cellular adhesion, migration, and differentiation, making it essential for tissue regeneration and development.
Type V collagen helps regulate the formation and diameter of type I collagen fibrils. It is present in connective tissues including skin, bone, the cornea, and the placenta. While it is less abundant than other types, its regulatory role is critical to proper fibril assembly and tissue organization.
Type X collagen is a network-forming collagen found mainly in cartilage, particularly in the growth plate and calcifying regions of developing bone. It plays a specialized role in endochondral ossification, the process by which cartilage is converted to bone.
