How Much Collagen Should You Take Daily?

There is no official recommended daily amount of collagen. In studies, hydrolysed collagen peptides have most often been used at about 2.5 to 15 grams a day, depending on the product and what the researchers were testing. Undenatured Type II collagen is a different ingredient and is studied at about 40 milligrams a day. For any product, the safest starting point is the serving size on its label, along with advice from your doctor.

It is the question almost everyone asks before buying a collagen supplement: how much do I actually need? Unlike vitamin C or iron, collagen has no official daily target, so the answer is less straightforward than the advertising suggests.

This guide explains the amounts researchers have tested, why those numbers cannot simply be copied, how to read a label correctly and what is known about taking too much. 

Is There an Official Daily Amount of Collagen?

No. Health authorities have not set a recommended daily allowance or a safe upper limit for collagen. That is partly because collagen is not an essential nutrient. Your body makes its own from the protein you eat, with the help of vitamin C and other nutrients.

What exists instead is a collection of clinical trials, each testing a particular product at a particular dose for a particular goal. That is why the numbers you see online vary so much.

What Amounts Have Studies Used?

A review of the published research found that effective amounts of collagen peptides in studies ranged from 2.5 to 15 grams a day. Here is how that breaks down by area. These are amounts that researchers tested, not a prescription.

Notice that none of these rows says "take this much". They say "this is what was tested".

Why There Is No One-Size-Fits-All Number

Several things make it unsafe to copy a number from a study:

• Different products: Studies often test one specific product, made from a particular source with particular peptides. A result from one does not automatically transfer to another.

• Different goals:A dose studied for skin hydration tells you little about what might suit joint comfort.

• Different people: Many trials involve a particular group, such as postmenopausal women or people with knee osteoarthritis.

• Different lengths: Most studies last between about two and twelve months, so we know less about use over years.

• Funding: As covered in our research guide, some results look weaker when only independent studies are counted.

So instead of searching for the "right number", it is more useful to know how to read the number that is actually on your product.

Grams, Servings and Capsules: Reading the Label Correctly

This is where many people get tripped up. Three points matter.

1. Serving size is not the same as the amount of collagen:  A label might say "one scoop (12 g)", but the collagen could be only part of that weight if the product also contains flavour, sweetener or other ingredients. Look for the line that states the collagen content per serving.

2. Capsules add up: If each capsule holds 500 mg of collagen, then 5 g (5,000 mg) would take 10 capsules. Do the arithmetic before comparing a capsule product with a powder.

3. Milligrams and grams are very different: One gram is 1,000 milligrams. An undenatured Type II product labelled "40 mg" and a hydrolysed powder labelled "10 g" are not competing doses. They are different ingredients.

Be cautious with "proprietary blends", where the total weight is listed but the amount of each ingredient is not. And always follow the directions on the product itself, since the manufacturer has set the serving size for that formulation. 

Can You Take Too Much Collagen?

Since no upper limit has been set, there is no official number to point to. Here is what is known:

• Trials at studied doses report few problems:  Studies using amounts up to about 15 grams a day have generally reported mild or no side effects. A 2023 meta-analysis of collagen peptides in knee osteoarthritis found no significant difference in side effects between collagen and placebo, although the quality of that evidence was rated very low.

• Long-term data is limited:  Most trials last months, not years, so we do not have strong evidence for very high amounts over long periods.

• More is not proven to be better: No study shows that doubling the dose doubles the result.

• Larger amounts may upset digestion:  Bloating, a feeling of fullness or stomach discomfort are the most commonly reported complaints.

• Kidney considerations: Collagen is rich in hydroxyproline, which the body can convert into oxalate, a substance linked to kidney stones in some people. If you have kidney disease or a history of kidney stones, speak to your doctor before taking collagen.

In short: staying within the label's directions is sensible, and exceeding them is not supported by evidence.

A Sensible Way to Approach Daily Use

This is general guidance, not personal medical advice.

1. Start with the label: Use the serving size the manufacturer recommends for that product.

2. Check with a professional first:  If you have a health condition, take medication, are pregnant or breastfeeding, or have allergies.

3. Be consistent: Studies involve daily use over weeks or months. Taking it now and then is not what was tested.

4. Watch how you feel: If you notice bloating or discomfort, talk to a healthcare professional. Some people find that splitting a serving across the day is more comfortable.

5. Set a review point: After a couple of months, ask yourself whether you have noticed anything and whether it is worth continuing. There is no guaranteed timeframe for results, and some people notice nothing.

6. Do not use collagen to replace protein: It lacks tryptophan, so it should sit alongside your normal protein foods. 

Does the Amount Change With Age, Weight or Gender?

There are no established adjustments. Most studies were done in adults, and some focused on groups such as postmenopausal women, older adults or people with joint problems. No dosing rules based on body weight or gender have been set. Children, teenagers, pregnant women and breastfeeding women should not start collagen supplements without medical advice.

Frequently Asked Questions

How much collagen should I take per day? 

There is no official amount. Studies of hydrolysed collagen peptides have mostly used about 2.5 to 15 grams a day, but the right serving depends on the product, so follow its label and ask your doctor.

How much collagen per day for skin?

 Skin studies have generally used about 2.5 to 10 grams a day for several months. Results are mixed, and no amount guarantees a visible change.

How much collagen per day for joints? 

Studies on knee joint symptoms have commonly used about 5 to 10 grams of hydrolysed collagen a day. Undenatured Type II collagen is studied at about 40 milligrams a day. Ongoing joint pain needs a medical check-up.

Is 10 grams of collagen a day enough? 

Ten grams is within the range used in many studies, but "enough" depends on your goal and product. There is no proof that a particular amount is ideal for everyone.

Is 20 grams of collagen a day too much? 

Twenty grams is above the range used in most trials, and there is little long-term data at that level. It may cause digestive discomfort in some people. Stick to the label unless a doctor advises otherwise.

Can I take collagen every day?

 Most studies used daily intake for weeks to months and reported few side effects. Long-term data beyond a year is limited, so review your use with a healthcare professional from time to time.

What should I do if I miss a day?

 Just continue with your normal serving the next day. There is no evidence that doubling up helps.

What time of day should I take collagen? 

There is no clear evidence that one time is better than another. Many people choose a time they can stick to. 

Does more collagen give better results?

 No study has shown that higher amounts always work better. Exceeding the label is not recommended.

Key Takeaways

• There is no official recommended daily amount of collagen and no set upper limit.

• Studies of hydrolysed collagen peptides have mostly used about 2.5 to 15 grams a day. Undenatured Type II collagen is studied at about 40 milligrams a day.

• Amounts from one study cannot be copied across products, goals or people.

• Check the collagen content per serving, not just the serving size, and do the math for capsules.

• More is not proven to be better. People with kidney conditions, allergies, pregnancy or regular medication should speak to a doctor first.

Health Precautions and Disclaimer

This article is for general information and education only. It is not medical advice and is not intended to diagnose, treat, cure or prevent any disease.