Collagen has become one of the most popular supplements in the wellness space, and unlike many trending ingredients, this one has a meaningful body of clinical research behind it. But the market is also flooded with confusing terminology, exaggerated claims, and products that vary wildly in quality. "Collagen peptides," "hydrolyzed collagen," "Type I," "Type III," "marine collagen," "grass-fed bovine" — if you've tried to make sense of collagen supplements, you've probably encountered more marketing than science.
This guide cuts through the noise. Here's what collagen is, what the different types do, how hydrolyzed peptides work, what the research actually supports, and what to look for when choosing a product.
What Is Collagen?
Collagen is the most abundant protein in the human body, accounting for approximately 30% of total protein content. It's the primary structural protein in connective tissue — the material that holds your body together. Skin, bones, tendons, ligaments, cartilage, blood vessels, teeth, the gut lining — all of these are built on collagen scaffolding.
Think of collagen as the structural framework of your body. It provides tensile strength (resistance to stretching) and structural integrity to tissues that need to hold their shape under stress. Without adequate collagen, skin loses elasticity, joints lose cushioning, bones lose density, and the gut lining becomes more permeable.
Your body produces collagen naturally, but production peaks in your mid-20s and declines roughly 1-1.5% per year after that. By age 40, most people have lost a meaningful percentage of their collagen production capacity. This decline is the biological basis for visible aging (wrinkles, thinning skin, joint stiffness) and is why collagen supplementation has attracted so much research interest.
Collagen Types: I, II, and III
There are at least 28 identified types of collagen in the human body, but three account for the vast majority of your collagen content.
Type I
The most abundant collagen type, making up roughly 90% of your body's collagen. Type I collagen provides structure to skin, bones, tendons, teeth, and connective tissue. It's the type most associated with skin health, hair strength, and nail growth. Most supplemental collagen — whether bovine or marine — is predominantly Type I.
Type II
Found primarily in cartilage, the flexible tissue that cushions joints. Type II collagen is the focus of joint health research and is most commonly sourced from chicken sternum cartilage. If your primary interest is joint support, look for products that specifically contain Type II collagen or undenatured collagen (UC-II), which works through a different mechanism than hydrolyzed peptides.
Type III
Often found alongside Type I, Type III collagen is a major component of skin, blood vessels, and the gut lining. It plays a role in skin elasticity, cardiovascular structure, and intestinal integrity. Bovine collagen is typically rich in both Type I and Type III, making it the preferred source for people focused on skin and gut health.
Hydrolyzed Collagen Peptides vs. Gelatin
Raw collagen molecules are enormous — too large for your body to absorb intact through the digestive tract. To make collagen supplementally useful, it needs to be broken down.
Gelatin is the result of partially breaking down collagen through heat. It dissolves in hot water, gels when cooled, and has been used in cooking for centuries. It's a step in the right direction for absorption, but the molecules are still relatively large.
Hydrolyzed collagen peptides take the process further. Through enzymatic hydrolysis, collagen is broken into small peptide chains (typically 2-5 kilodaltons in molecular weight). These small peptides are highly bioavailable — research shows they're absorbed through the intestinal wall into the bloodstream within hours of ingestion, with detectable peptide levels in the blood peaking at 1-2 hours post-consumption.
Once absorbed, these peptides serve a dual function. First, they provide the amino acid building blocks (primarily glycine, proline, and hydroxyproline) that your body uses to synthesize new collagen. Second, and perhaps more importantly, research suggests that the peptides themselves act as signaling molecules — they stimulate fibroblasts (the cells that produce collagen) to increase production. In other words, collagen peptides don't just provide raw materials; they tell your body to make more collagen.
What Does the Research Actually Say?
Skin Health
This is collagen's strongest research area. A 2019 systematic review of 11 randomized controlled trials (805 total participants) concluded that oral collagen peptide supplementation significantly improved skin hydration, elasticity, and wrinkle depth compared to placebo. Most studies used 2.5 to 10 grams per day over 8 to 12 weeks. A 2021 meta-analysis covering 19 studies reached similar conclusions, noting that hydrolyzed collagen significantly improved skin hydration and elasticity, with effects becoming apparent after 8 weeks of daily use.
Joint Health
A 2018 study published in the Journal of the International Society of Sports Nutrition found that athletes who supplemented with 5 grams of collagen peptides daily for 12 weeks experienced significant reductions in activity-related joint pain compared to placebo. A separate study on adults with knee osteoarthritis showed improvements in joint comfort and function after 6 months of collagen peptide supplementation.
Hair and Nails
A 2017 study found that women who took 2.5 grams of specific collagen peptides daily for 24 weeks experienced a significant increase in nail growth rate and a decrease in nail breakage compared to placebo. Hair research is less extensive but emerging, with preliminary studies suggesting improvements in hair thickness and growth.
Gut Health
This is an area with growing research interest. Collagen is rich in glycine and glutamine, both of which play roles in maintaining the intestinal lining. While large-scale clinical trials specific to collagen and gut permeability are still limited, the mechanistic rationale is supported by research on the individual amino acids. Glycine has anti-inflammatory properties in the gut, and glutamine is a primary fuel source for intestinal epithelial cells.
How Much Do You Need?
Based on the clinical research, effective doses for most benefits fall between 2.5 and 15 grams per day. The most commonly studied and recommended range for general skin, hair, and joint support is 5 to 10 grams daily. Consistency matters more than quantity — 5 grams daily for 3 months will likely outperform 15 grams sporadically.
Collagen peptides are unflavored and dissolve easily in both hot and cold liquids, which makes them one of the simplest supplements to incorporate into a daily routine. Adding them to coffee, matcha, or a morning smoothie is the most common approach.
Grass-Fed Bovine vs. Marine Collagen
Bovine (cow) collagen is the most common source, typically providing Types I and III. Grass-fed bovine collagen comes from cattle raised on pasture rather than feedlots, which reflects both ethical sourcing practices and potentially better amino acid profiles due to healthier animal nutrition. It dissolves well, is generally unflavored, and has the broadest research base.
Marine collagen is sourced from fish skin and scales, and is predominantly Type I. It has a slightly smaller peptide size on average, which some research suggests may improve absorption rates. Marine collagen is preferred by people who avoid red meat or who want a pescatarian-compatible option. The tradeoff is that marine collagen is typically more expensive and has a narrower type profile (mostly Type I only).
Both sources are effective. The best choice depends on your dietary preferences, the collagen types you're targeting, and your budget.
Why Adding Collagen to Matcha Works
Collagen peptides dissolve cleanly in warm liquids without affecting flavor — making matcha an ideal delivery vehicle. Beyond convenience, there's a functional synergy: matcha's antioxidants (particularly EGCG) may help protect existing collagen from oxidative degradation, while the collagen peptides stimulate new production. It's both defense and offense for your body's connective tissue infrastructure.
Shroomé includes grass-fed bovine collagen peptides (Types I and III) in every sachet, providing a clinically relevant dose alongside ceremonial matcha and functional mushroom extracts. Learn more about our full ingredient stack, or read about the specific benefits of collagen in matcha.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.