Collagen supplements are not proven to do much for most seniors. Some studies show small gains for skin and joint stiffness. But a 2025 review found that when you look only at high-quality studies, or studies not paid for by companies, the skin benefits disappear (Am J Med, PubMed 40324552).
If you want to try collagen, it’s unlikely to hurt you. Just know what you’re paying for. Below is the evidence, benefit by benefit.
What collagen is
Collagen is the most abundant protein in your body. Its fibers help build skin, bone, muscles, tendons and cartilage (Harvard T.H. Chan School of Public Health). Your body makes less of it as you age, which is one reason skin thins and wrinkles.
Supplements are usually sold as collagen peptides or hydrolyzed collagen. Here is the key point. When you swallow collagen, your stomach breaks it down into amino acids, the building blocks of protein. Your body then sends those amino acids wherever it needs protein most. It doesn’t send swallowed collagen straight to your face or knees.
What the research shows
Skin
- A 2021 review of 19 trials with 1,125 people (ages 20 to 70, 95% women) found better skin hydration and elasticity with collagen (PubMed 33742704).
- A 2025 review of 23 trials with 1,474 people looked deeper. All trials together showed gains. But studies not funded by companies showed no effect, and high-quality studies showed no effect either. The authors said there is no clinical evidence to support collagen for preventing or treating skin aging.
This is why who paid for a study matters. Many collagen trials are funded by the companies that sell it.
Joints and osteoarthritis
A 2019 review of trials in people with osteoarthritis found collagen lowered total symptom scores and pain on a 100-point scale by about 17 points. It also eased stiffness (PubMed 30368550).
But the details are mixed. On the separate pain and daily function parts of the main arthritis scale, the change was not significant. So collagen may help a little with stiffness for some people. It is not a replacement for proven care like exercise, weight control and physical therapy. If you’re also thinking of glucosamine, see our glucosamine guide.
Bones
One trial gave 5 grams a day of collagen peptides or a placebo to 131 women after menopause with low bone density. 102 finished the 12 months. Spine bone density rose slightly in the collagen group (T-score +0.1) and dipped slightly with the placebo (-0.03) (PubMed 29337906).
That is a small change in one study. It is nowhere near the effect of osteoporosis medicines. If you have osteoporosis, don’t swap your treatment for collagen. Our osteoporosis medications guide explains the options and what Medicare pays.
Muscle
Collagen is not a complete protein. It is missing tryptophan, one of the amino acids your body can’t make. For muscle, food protein like eggs, fish, dairy and beans is a better choice. Our protein needs guide shows how much you need each day after 65.
Doses used in studies
Doses and forms vary a lot from study to study. The bone trial above used 5 grams a day for a full year. Most other trials ran for weeks to months, not days.
So if you try collagen, follow the label and give it about 3 months. Write down how your skin or joints feel before you start. If you can’t tell a difference after that, stop and save the money.
Safety and quality concerns
Harvard notes that research has not shown harmful side effects in people given collagen. But there are real concerns:
- No review before sale. The FDA doesn’t check supplements for safety or effectiveness before they are sold.
- Unknown contents. You can’t always be sure what’s in the tub.
- Heavy metals. Some collagen products have been found to contain heavy metals.
- Allergies. Collagen is made from animal parts, often from cows, pigs or fish. If you have a fish allergy, check the source on the label.
- An excuse to skip healthy habits. Harvard warns that a supplement shouldn’t replace sleep, sun protection and not smoking.
- Kidney disease. If your doctor has told you to limit protein, ask before adding a collagen powder.
Tip: look for a product with a third-party seal, such as USP or NSF. It confirms the label matches what’s inside, though it doesn’t prove the product works.
Can food give you collagen?
Bone broth is sold as a collagen food. It has about 5 to 10 grams of protein per cup, mostly from gelatin. Despite the claims, it has only small amounts of minerals like calcium. One small study also found more lead in broth made from chicken bones than in broth made with the meat only, though the level was still low.
A better plan is to help your body make its own collagen:
- Protein foods: fish, poultry, eggs, dairy, beans and soy supply the amino acids collagen is made from. Cottage cheese is an easy, soft option.
- Vitamin C: citrus, berries, peppers, tomatoes and leafy greens. Your body needs it to build collagen.
- Zinc: shellfish, beans, nuts, seeds and whole grains.
- Sun protection and no smoking. Both help protect the collagen you already have.
My take
If you enjoy a collagen drink and can afford it, it’s unlikely to harm you. But the strongest studies don’t back the skin claims. The joint and bone effects are small. Spend first on foods with protein and vitamin C, sunscreen and regular exercise. Those have much better proof.
Common questions
Do collagen supplements work for seniors?
The proof is weak. Some studies show small skin and joint benefits, but high-quality and independent studies found no skin benefit.
Is collagen good for joint pain?
A review found small improvements in stiffness and total symptoms in osteoarthritis. The pain and function scores alone did not improve significantly.
Can collagen help osteoporosis?
One small trial found a slight rise in spine bone density with 5 grams a day. It is not a substitute for osteoporosis medicine.
Is collagen safe to take?
Studies have not shown harmful side effects. But supplements aren’t reviewed by the FDA before sale, and some have contained heavy metals. Choose a third-party tested product.
Is bone broth a good source of collagen?
It has 5 to 10 grams of protein per cup, mostly from gelatin. It has only small amounts of minerals.
Written by Khasim Basha Shaik. I research and compare Medicare plans and health topics for readers. I am not a doctor, dietitian or licensed insurance agent. This article summarizes Harvard, FDA and published research and is not medical advice. Last reviewed October 20, 2026.
