What to Look for in a Collagen Supplement — A Complete Buyer’s Guide

Originally published 2021. Updated July 2026 by Suzanne & Carl LaFlamme, Shaklee Ambassadors at All’s Well Health with current research and recommendations. Note: This post contains product recommendations and links. We may earn a commission on purchases but at no extra cost to you.

Walk into any health food store or scroll through any wellness site and you’ll find dozens of collagen supplements competing for your attention. Powders, capsules, gummies, liquids — all of them making similar promises about skin, joints, hair, and nails.

Here’s the problem: most of them don’t work. Not because collagen supplementation doesn’t work — it does, when done right — but because most products on the market cut corners on the very things that determine whether a collagen supplement actually delivers results.

After 34-plus years in the wellness space, we’ve seen a lot of products come and go. What we’ve learned is that buying collagen isn’t like buying most supplements. The differences between a product that works and one that wastes your money come down to specific, knowable criteria — and once you know what they are, you’ll never look at a collagen label the same way again.

Knowing what to look for in a collagen supplement is the difference between results and wasted money. This guide covers everything you need to evaluate any collagen supplement before you buy it. We’ll also share the products we use and recommend, and why they meet every standard on this list.

The First Question to Ask: Is It Hydrolyzed?

Before you look at anything else on a collagen label — the type, the dose, the added ingredients — you need to answer one question: is this collagen hydrolyzed?

Hydrolysis breaks collagen down into smaller peptides your body can actually use. This matters enormously because collagen molecules in their natural state are simply too large for your gut to absorb. Non-hydrolyzed collagen passes right through your digestive system. You’re essentially paying for something your body can’t use.

Research supports the superiority of low molecular weight collagen peptides in the range of 2,000 to 3,500 daltons for bioavailability and absorption. When you see “hydrolyzed collagen” or “collagen peptides” on a label, that’s what you’re looking for. If the label doesn’t say either of those things, put it back.

This is the single biggest mistake we see people make when buying collagen, and it’s one of the main reasons people conclude that collagen “doesn’t work.” They took a form their body couldn’t absorb in the first place.

Skip the Pills and Tablets

If a collagen supplement comes in pill or tablet form, move on. It’s not a matter of preference — it’s a matter of physics.

Delivering a therapeutic dose of collagen in a pill or tablet format requires far more capsules than any reasonable person will take consistently. And even then, the compressed tablet form affects how the product breaks down and absorbs. Collagen supplements work best in powder or liquid form, where the hydrolyzed peptides are already in a state your body can readily process.

Dose Matters — Don’t Settle for Less Than 5 Grams

One of the most deceptive practices in the collagen supplement industry is underdosing. A product can technically contain collagen and list impressive-sounding ingredients, but if the dose is too low to produce results, you’ll never notice a difference.

Based on our experience and the research we’ve reviewed, you need between 5 and 10 grams of collagen per serving to see visible benefits. If a product delivers less than 5 grams, it’s not going to move the needle — regardless of how good the rest of the formula looks.

Always check the supplement facts panel before buying. The collagen dose should be front and center, not buried in a proprietary blend where the actual amounts are hidden.

Know Your Collagen Types: Why I and III Are the Ones That Matter

There are at least 28 known types of collagen in the human body, but for most people’s goals — healthy skin, strong joints, resilient hair and nails — two types do the heavy lifting.

Type I Collagen

Type I is the most abundant collagen in the human body. It’s found throughout your skin, joints, bones, and tendons and plays a central role in maintaining skin’s firmness and structural integrity. If you’re using a collagen supplement as part of a skin health routine, Type I is non-negotiable.

Type III Collagen

Type III collagen is found alongside Type I in your skin and naturally co-exists with it in the body. It provides elasticity and structural integrity to expandable tissues including blood vessels, intestines, and other hollow organs. Importantly, Type III collagen decreases with age, which is why so many people notice their skin losing its bounce and resilience over time.

Together, Types I and III cover the full picture of skin and connective tissue health. A quality collagen supplement should contain both.

A note on marine collagen: fish-derived collagen delivers Type I effectively and has grown in popularity. But bovine collagen naturally contains both Type I and Type III. That makes it more comprehensive and typically more budget-friendly. If skin elasticity and joint health are both priorities — and for most of us they are — bovine collagen is the stronger choice.

The Ingredient Your Collagen Supplement Can’t Work Without: Vitamin C

This one surprises a lot of people, but the science is unambiguous: your body cannot effectively produce collagen without Vitamin C. When you think about what to look for in a collagen supplement, Vitamin C isn’t optional — it’s essential. Oregon State University’s Linus Pauling Institute confirms Vitamin C plays a direct role in collagen synthesis at the enzymatic level.

Vitamin C activates two essential enzymes in collagen synthesis — prolyl hydroxylase and lysyl hydroxylase. These enzymes hydroxylate proline and lysine residues in collagen molecules. That process stabilizes the collagen triple helix and drives collagen cross-linking.

In plain English: Vitamin C activates the enzymes that build and stabilize collagen at the molecular level. Without it, the process breaks down. Without Vitamin C, the body simply cannot produce strong, functional collagen.

Beyond its role in collagen synthesis, Vitamin C is a powerful antioxidant that helps protect skin cells from damage caused by reactive oxygen species — two factors that accelerate collagen breakdown.

Your body can’t produce Vitamin C on its own, which means you need it either from your diet or your supplement. A well-formulated collagen product should include Vitamin C as part of the formula — not as an afterthought, but as a core ingredient the collagen depends on to work.

Biotin: The Often Overlooked Essential

Also known as Vitamin B7, biotin is another ingredient we look for in any collagen supplement worth recommending.

Biotin supports healthy hair, skin, and nails, the same benefits most people take collagen for in the first place. More importantly, research links biotin deficiency directly to hair loss and skin and nail problems. If you’re taking collagen for those reasons, biotin in the same formula closes that gap. Don’t leave it to chance.

A collagen supplement that pairs biotin with Types I and III collagen and Vitamin C shows you the manufacturer built it to actually deliver results.

The Nine Essential Amino Acids and the Gap Most Products Miss

Here’s something that genuinely surprised us when we learned it: collagen itself contains only eight of the nine essential amino acids your body needs to synthesize it. Tryptophan, the ninth, is absent from collagen protein.

Why does this matter? Because all nine essential amino acids are required for your body to actually build and repair collagen. If your supplement doesn’t supply that ninth amino acid alongside the collagen, your body has to source it elsewhere — and if it can’t find it, the synthesis process is compromised.

Most collagen products on the market don’t address this gap at all. It’s one of those details that separates a product built around real nutritional science from one built around marketing claims.

Sourcing Matters: Choose Grass-Fed and Pasture-Raised

Since most collagen supplements derive their collagen from animal sources, where and how that animal was raised is a legitimate quality question — not just an ethical one.

Grass-fed and pasture-raised means the animal lived humanely and ate as close to its natural diet as possible. What an animal eats affects the nutritional quality of what comes from it. Most nutrition experts regard grass-fed sources as cleaner and higher quality than conventionally raised alternatives.

Beyond sourcing, look for a product free from artificial colors, artificial flavors, and added sugars. These ingredients have no business being in a collagen supplement and are a reliable signal that a manufacturer is prioritizing taste and shelf appeal over actual quality.

Clean Label Checklist: What to Look for in a Collagen Supplement

Here’s a quick summary of what to look for in a collagen supplement. Before buying anything, run it through this checklist:

Labeled as hydrolyzed collagen or collagen peptides — not just “collagen”
Delivered in powder or liquid form — not pills or tablets
Minimum 5 grams of collagen per serving — ideally 5 to 10 grams
Contains Type I and Type III collagen
Includes Vitamin C as part of the formula
Contains biotin (Vitamin B7)
Supplies all nine essential amino acids
Sourced from grass-fed, pasture-raised bovine
Free from artificial colors, flavors, and added sugars

If a product you’re considering can’t check every one of these boxes, it’s not a complete collagen supplement — no matter what the front of the label says.

Our Recommendation: Shaklee Collagen-9

After applying every criterion on this list, Shaklee’s Collagen-9 is the bovine collagen supplement we recommend without reservation.

Collagen-9 checks every box. It’s hydrolyzed, delivered in powder form, and properly dosed. It sources from grass-fed bovine collagen with both Type I and Type III. Vitamin C and biotin are core formula ingredients — not afterthoughts. And it closes the ninth amino acid gap that most products ignore entirely, delivering all nine essential amino acids your body needs to synthesize collagen effectively.

After 34-plus years of personal experience with Shaklee products, we’ve learned to trust results over marketing. Collagen-9 is one of those products that delivers exactly what it promises when you give it the time it needs; typically 30 to 90 days for meaningful, visible changes.

Want to Take It Further? Pair It With Liquid BioCell Life+

If you want to go beyond replenishment and support your collagen at every stage of its lifecycle, Collagen-9 and Liquid BioCell Life+ work together in a way that’s genuinely complementary.

Collagen-9 supplies the amino acid building blocks your body needs to produce new collagen. Life+ is formulated to help your body use those building blocks more effectively — protecting existing collagen from breakdown, stimulating natural collagen renewal, and building the supportive environment collagen needs to stay strong over time.

Together, they cover the complete collagen system — from raw material supply to lifecycle support. It’s the most comprehensive approach to collagen supplementation we’ve found. To read about our personal two-month experience with Life+ and what we noticed, start here.

The Bottom Line

Not all collagen supplements are created equal. If you’ve tried collagen before and didn’t see results, the most likely explanation isn’t that collagen doesn’t work — it’s that the product you used didn’t meet the criteria that make collagen work.

Use this guide as your buying checklist. Hold every product you consider up against these standards. And if you want a product that already meets every one of them, Shaklee’s Collagen-9 — backed by an unconditional money-back guarantee — is exactly where we’d start.

Suzanne and Carl LaFlamme are independent Shaklee Ambassadors. 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. Individual results may vary.