What Is Collagen Peptides? A Complete Guide

Collagen is the single most abundant protein in the human body, comprising approximately one-third of total proteins. It forms the structural foundation of skin, tendons, bones, cartilage, and all other connective tissues. The word Collagen comes from the Greek kolla (meaning "glue") and gene — reflecting the gelatinous, glue-like property people observed in cooled bone broth long before the underlying biology was understood.

So what is Collagen peptides exactly? Native Collagen is a large, complex polymer with low solubility and bioavailability. To be used by the body, that large polymer must be broken down into smaller segments through a process called hydrolysis. The result — Collagen peptides (also called hydrolyzed Collagen) — consists of small, low-molecular-weight amino acid chains (3–6 kDa) that the body can absorb and utilize far more readily than intact Collagen.

Studies have shown that when Collagen hydrolysate is taken orally, it is absorbed as di- and tripeptides (two or three amino acids) typically rich in hydroxyproline. These smaller peptides are believed to enter circulation and reach target tissues like skin or cartilage, where they may help support Collagen-producing cells called fibroblasts.

Collagen is rich in the amino acids glycine (33%), proline, and hydroxyproline (22%), which help provide Collagen's characteristic fiber-like structure and its rigidity and resistance to stretching. Notably, Collagen contains two amino acids found in very few other proteins: hydroxyproline and hydroxylysine.

Scientists have identified 28 subtypes of Collagen, with types I, II, and III making up 80–90% of the Collagen in the human body. Type I is the most abundant in skin (approximately 80%) and is also found in tendons, organs, bone, and vascular connective tissue. Type II predominates in cartilage (90–95% of the extracellular matrix), while Type III is found in reticular connective tissue and blood vessels.

The primary commercial sources of Collagen used in supplements include bovine (cattle) hide and bone, porcine hide and bone, chicken sternal cartilage, and fish skin and scales. Bovine and porcine tissues are the major sources due to their wide availability and biocompatibility with human tissues.

The dietary tradition of Collagen-rich preparations predates modern science by millennia. In Traditional Chinese Medicine, Collagen-rich foods were used to support skin elasticity, healthy aging, and joint strength. In Europe during the Middle Ages, hearty soups and stews made from bones and cartilage were common in folk medicine. Indigenous cultures around the world — from Native American tribes consuming boiled animal hides and bone marrow to Vietnamese pho simmered for hours — independently developed their own Collagen-rich preparations.

Modern Collagen peptide formulations represent a convenient, contemporary form of this continuous tradition — a powder that dissolves in a beverage rather than a broth requiring hours of simmering.

Skin Health and Anti-Aging: Research suggests that Collagen peptides may support skin health by promoting elasticity and hydration. A systematic review and meta-analysis of 10 RCTs with 646 participants found that Collagen supplements were statistically effective in increasing skin hydration and elasticity. Multiple studies have shown that hydrolyzed Collagen supplementation promotes decreased wrinkle formation, increased skin elasticity, increased hydration, and increased Collagen content and density — factors closely associated with aging-related skin changes.

Hair and Nails: Collagen peptides provide amino acid substrates — notably proline, glycine, and hydroxyproline — that support keratin synthesis and dermal matrix integrity around follicles. A systematic review found Collagen peptides may improve the clinical appearance, strength, and brittleness of hair. For nails, a 2017 trial found that bioactive Collagen peptides taken for 24 weeks increased nail growth rate by 12% and reduced the frequency of broken nails by 42% in women with brittle nail syndrome.

Joint Health: A systematic review and meta-analysis provides evidence of significant pain reduction in knee osteoarthritis patients who received Collagen peptides compared to placebo. For exercise-related joint pain, a systematic review of 15 RCTs found that Collagen supplementation increased pain-free time to exertion and Collagen synthesis. The beneficial effects appear to take effect after three months or longer.

Bone Health: Preliminary research indicates that Collagen supplementation may support bone strength, density, and mass. These findings principally derive from studies in postmenopausal women with osteopenia and are promising but require larger, independent replications.

It's worth noting that while the evidence is encouraging, many trials have been relatively short (4–12 weeks), and researchers continue to call for larger, long-term studies. If you have questions about how Collagen peptides might fit your personal wellness goals, our naturopath is available for a free consultation.

Nature's Sunshine's premium Collagen peptides are designed for anyone looking to support their body's natural Collagen needs. Since Collagen production naturally declines with age — and skin aging is accompanied by decreasing Collagen, elastin fiber, and hyaluronic acid levels — adults of all ages may benefit from supplementation.

These Collagen peptides may be especially relevant for those seeking to support skin elasticity and hydration for a more youthful appearance, promote healthy hair and stronger nails, or support bones and joints for an active lifestyle. The product also supports gut health and provides electrolytes and trace minerals.

With a non-GMO, Keto-friendly, dairy-free, gluten-free, soy-free, and Paleo-friendly formulation, this Collagen is designed to fit a wide range of dietary preferences. However, since Collagen supplements are sourced from animals, individuals with allergies to specific animal sources should exercise caution. Collagen is also an incomplete protein — it lacks the essential amino acid tryptophan — so it should not be used as a sole protein source.

Not sure if Collagen peptides are right for you? Our naturopath offers free consultations to help you make informed decisions about your wellness routine.

One of the best things about Collagen peptides is how effortlessly they fit into your day. Collagen is odorless, tasteless and mixes easily into any hot or cold beverage, smoothie or food. It is easily integrated into any daily wellness program.

Simply stir 1 scoop into any beverage (coffee, tea, water, fruit juice, etc.), or add it to your favorite recipes. Use daily for best results.

Research suggests that vitamin C is a cofactor in the hydroxylation of lysine and proline residues during Collagen synthesis, so pairing your Collagen with vitamin C-rich foods or beverages may complement your supplementation routine. For joint-related benefits, studies suggest that beneficial effects may take three months or longer to become apparent, so consistency is key.