Facts you should know about the collagen diet

Collagen Diet
A collagen diet is relatively safe if carefully monitored.

  • Collagen is a general term for structural proteins in the skin and connective tissue.
  • A collagen diet is an eating plan to consume foods high in collagen that some reports claim to improve skin and beauty. Experts generally agree that more research is needed before these claims can be proven.
  • Decreases in collagen with aging may lead to skin and hair problems.
  • A collagen diet is relatively safe if carefully monitored.
  • Collagen supplements are relatively safe as long as 20 grams per day is a maximum dose. However, some supplements have determined not to be safe due to virus contamination or toxic content.

What is collagen? What is the collagen diet?

Collagen is general term for the main structural proteins found in the skin and connective tissues in humans and animals and makes up about 30% of the protein in the human body. Plants also contain collagen. Collagen is comprised of 19 amino acids (for example, glycine, proline, hydroxyproline, lysine and arginine). There at least 29 types of collagen. Humans have mainly Types I-III. Type I exists mainly in skin, tendon, vasculature, organs, and bone. Type II is in cartilage, and Type III is in reticular fibers (thin branching fibers in connective tissue).

The collagen diet is an eating plan to avoid too much sugar and refined carbohydrates and consume foods high in collagen that some sources report maintains youthfulness, energy, and beauty. Other forms of the diet may include consuming collagen supplements (for example, Dr. Axe diet supplements) and collagen injections.

What are food sources of collagen?

Food sources of collagen include the following:

  • Fish
  • Chicken
  • Egg whites
  • Citrus fruits
  • Berries
  • Red and yellow vegetables
  • Garlic
  • White tea
  • Leafy greens
  • Cashews
  • Tomatoes
  • Bell peppers
  • Beans
  • Avocados
  • Soy
  • Herbs high in collagen (Chinese knotweed, horsetail, gynostemma)
  • Herbs that help to produce collagen (gotukola, bala, ashwagandha)

The above foods are considered to be foods to improve skin elasticity, anti-aging, and help joint pain by individuals who recommend this diet. It is important to note that while small, limited studies have shown some benefits of consuming collagen, it is unclear whether these benefits would have also occurred by consuming any type of protein and maintaining a healthy diet in general. Also, since collagen cannot be absorbed and is broken down into amino acids when consumed, the consumption of collagen does not guarantee that any new collagen will be made.

Symptom of Low Collagen Levels

Joint Pain

Joint pain can be caused by injury affecting any of the ligaments, bursae, or tendons surrounding the joint. Injury can also affect the ligaments, cartilage, and bones within the joint. Pain is also a feature of joint inflammation (arthritis, such as rheumatoid arthritis and osteoarthritis) and infection, and extremely rarely it can be a cause of cancer of the joint. Pain within the joint is a common cause of shoulder pain, ankle pain, and knee pain. Joint pain is also referred to as arthralgia.

What happens when collagen levels drop?

Does collagen help skin and hair? The body's production of collagen decreases dramatically with aging. When this happens, there is a reduction in your skin elasticity and epidermal thickness. This leads to skin damage and an increase in wrinkles, crepey skin, and sagging skin. Decreases in collagen may also lead to stiffer and less flexible tendons and ligaments, shrinking and weakening muscles, joint pain, osteoarthritis, and gastrointestinal problems. Low collagen may reduce hair growth and contribute to hair thinning.

What are the health benefits of a collagen diet?

Many health benefits are claimed by those individuals who are proponents of the collagen diet and/or collagen supplements. The claims include

  • improved skin tone,
  • reduced hair loss,
  • restore collagen to the face,
  • improved sleep,
  • build stronger muscles,
  • promote bone health,
  • strengthen your immune system,
  • healthy for your heart,
  • increase antioxidant and detoxification,
  • increase your lifespan,
  • restore sexual and hormone health,
  • promote bone health,
  • help individuals to be calmer and more upbeat mood, and
  • help with weight control.

Although many of these claims have not been scientifically proven, the overall diet recommendations (minus the supplements) often contain many foods recommended by a dietitian for a healthy diet.

What are the cons of a collagen diet?

There seems to be little if any cons to a collagen diet (excluding supplements). However, there are a few such as

  • allergic reactions to potential allergens like shellfish or eggs;
  • heartburn;
  • some individuals complain of felling too full and others complain of a bad taste; and
  • too much collagen can result in thickened skin and organ damage.


Weight loss occurs in the belly before anywhere else. See Answer

Are collagen supplements safe?

Most collagen supplements undergo hydrolyzation to form hydrolyzed collagen that makes it easier to absorb and turn into tablets, capsules, and powders. Some supplements are infused foods that are drinks and/or edibles injected with collagen. Ingesting more than 20 grams per day may be harmful according to some dieticians. Bone broth supplement is in a trend to use as a supplement, but recent data suggests the collagen in it may not absorb very well. In addition, supplements can be made from animal byproducts (for example, bones, hoofs, tendons) and some may contain viruses (for example, mad cow disease) and others have had high concentrations of toxic metals found in the preparation. Check the ingredients before purchasing. Before using a supplement, consult with your doctor.

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Medically Reviewed on 3/24/2022
Cruz, J. "Dietary Collagen -– Should consumers believe the hype?" Today's Dietitian. March 2019. <https://www.todaysdietitian.com/newarchives/0319p26.shtml>.