Myths About Hyaluronic Acid

Hyaluronic acid has moved from cosmetology and orthopedics into sports nutrition, and with it a whole range of beliefs, from "not absorbed at all" to "replaces joint injections." The editorial team checked the most common claims against scientific data.

Myth 1: "Hyaluronic acid from a capsule is simply digested and has no effect anywhere"

This myth looks logical: hyaluronic acid (HA) is a large polysaccharide, and the digestive system usually breaks such molecules down into simple components. Hence the conclusion that oral HA is no different from ordinary sugar. However, the real picture is more complex, and the editorial team considers it necessary to examine it in more detail.

In a classic study by Balogh and co-authors (2008), rats and dogs were given radioactively labeled high-molecular-weight HA. The label was later found in the blood, joints, skin, and other tissues. This does not prove that the whole molecule reaches the joint, but it shows that its breakdown products are absorbed and distributed by the body rather than merely excreted in the feces.

Another possible mechanism discussed in reviews is indirect. HA fragments may interact with receptors in the intestinal wall (in particular, Toll-like receptor 4) and influence the immune response and cytokine production. This hypothesis still needs to be confirmed in humans, but it explains how the substance can act even without large-scale delivery to the joint.

So it is correct to put it this way: oral HA is partly broken down and partly absorbed, and its effects most likely have both a direct and an indirect component. The claim "has no effect at all" is just as unsupported by data as the advertising claim "reaches the joint directly."

Myth 2: "Capsules replace joint injections"

Intra-articular injections of HA preparations (so-called viscosupplementation) and HA dietary supplements are often confused, because the active substance has the same name. In reality these are fundamentally different approaches with different doses, routes of administration, and levels of evidence.

With an injection, a doctor introduces tens of milligrams of HA directly into the joint cavity. A supplement, on the other hand, usually contains 80–240 mg per day, which passes through the gastrointestinal tract and is distributed throughout the body. Comparing these approaches "milligram for milligram" is incorrect.

Even regarding injections, professional societies do not share a single opinion. The 2019 OARSI guidelines assess intra-articular HA cautiously, as an option for select patients with knee osteoarthritis. Thus, neither approach is a universal solution.

For an athlete with acute joint pain or a suspected meniscus or ligament injury, no supplement will replace examination by an orthopedist and imaging. Oral HA is at best an adjunct for chronic discomfort, not an alternative to medical intervention.

Myth 3: "The higher the molecular weight, the better"

Manufacturers often emphasize "high-molecular-weight" HA as premium, while others, on the contrary, advertise "low-molecular-weight, which is better absorbed." Both marketing arguments have a rational kernel, but neither is a proven advantage.

In the body's tissues, HA exists as very long chains, and it is precisely these that are responsible for the viscosity of synovial fluid. At the same time, fragments of different lengths have different biological activity: short chains can even act as inflammation signals. Therefore "smaller" does not always mean "better," and vice versa.

Clinical studies in humans have used different forms: rooster comb extract containing HA (Kalman et al., 2008), enzymatically produced polymeric HA (Tashiro et al., 2012), and others. There are almost no direct comparisons of forms in large, high-quality studies, so it is impossible to unequivocally recommend a particular molecular weight.

The editorial team's practical conclusion: it is more important that the product matches the composition used in studies, has a transparent specification, and confirmed quality, than that the label carries a fashionable word about molecular weight.

Myth 4: "HA is only for the skin" and myth 5: "The effect is visible within a week"

The popularity of HA in cosmetics has created the impression that it is a purely "beauty ingredient." In reality, hyaluronan is one of the basic substances of connective tissue. According to the review by Fraser and co-authors (1997), the body of an adult weighing 70 kg contains about 15 g of HA, a significant part in the skin, as well as in synovial fluid, cartilage, and the vitreous body of the eye.

Studies of oral HA cover both directions. Kawada and co-authors (2014) described an improvement in skin hydration, and the review by Oe and co-authors (2016) summarized work on knee joint pain. So for athletes, it is precisely the "joint" aspect that is of interest, although the evidence base here is modest.

As for the speed of the effect: in clinical work, the duration of intake ranged from a few weeks to 12 months. In the study by Tashiro and co-authors (2012), the difference from placebo in certain subgroups appeared gradually over months of intake.

You should not expect noticeable changes within a few days. If joint pain disappeared within a week, it is more likely the natural course, a change in loads, or a placebo effect than the result of the supplement's action.

• The minimum reasonable period for assessment is 8–12 weeks.
• It is better to assess the effect using a diary of pain and function rather than by "eyeball" impressions.
• In parallel, you should review technique, training volume, and recovery.

Myth 6: "Natural HA is absolutely safe for everyone"

Oral HA is indeed considered a substance with a good safety profile: in clinical studies, the frequency of side effects did not differ significantly from placebo. However, "well tolerated" does not mean "suitable for absolutely everyone and in any form."

HA for supplements is obtained in two main ways: from rooster combs or by bacterial fermentation. Products of animal origin may be undesirable for people with an allergy to bird proteins or for those who follow a vegetarian diet. Fermented HA does not have this problem, so it is worth paying attention to the source of the raw material.

There is insufficient data on taking HA during pregnancy and breastfeeding, so in these situations the decision should be made by a doctor. The same applies to people with a history of oncological diseases, since the role of hyaluronan in tumor biology is being actively studied.

Finally, many "joint" complexes contain HA together with glucosamine, chondroitin, curcumin, and other components. The safety profile of such a mixture is determined by all the ingredients, not just hyaluronic acid.

Editorial conclusions

Most myths about hyaluronic acid arise from mixing cosmetic, medical, and sports contexts. Oral HA is not an "empty" substance, but it is also not a replacement for injections or treatment.

Available studies point to a moderate potential effect on joint discomfort and skin hydration with prolonged intake. The evidence base is limited by small samples and the heterogeneity of products.

When choosing a product, it is worth considering the source of the raw material, the transparency of the composition, and correspondence to the doses used in studies, rather than loud advertising claims about molecular weight.

We also recommend reading our materials on combining hyaluronic acid with other supplements, on glucosamine and chondroitin, and on MSM for joint support.

References

1. Fraser JR, Laurent TC, Laurent UB. Hyaluronan: its nature, distribution, functions and turnover. J Intern Med. 1997;242(1):27–33.
2. Balogh L, Polyak A, Mathe D, et al. Absorption, uptake and tissue affinity of high-molecular-weight hyaluronan after oral administration in rats and dogs. J Agric Food Chem. 2008;56(22):10582–10593.
3. Oe M, Tashiro T, Yoshida H, et al. Oral hyaluronan relieves knee pain: a review. Nutr J. 2016;15:11.
4. Kalman DS, Heimer M, Valdeon A, et al. Effect of a natural extract of chicken combs with a high content of hyaluronic acid (Hyal-Joint) on pain relief and quality of life in subjects with knee osteoarthritis: a pilot randomized double-blind placebo-controlled trial. Nutr J. 2008;7:3.
5. Tashiro T, Seino S, Sato T, et al. Oral administration of polymer hyaluronic acid alleviates symptoms of knee osteoarthritis: a double-blind, placebo-controlled study over a 12-month period. ScientificWorldJournal. 2012;2012:167928.
6. Kawada C, Yoshida T, Yoshida H, et al. Ingested hyaluronan moisturizes dry skin. Nutr J. 2014;13:70.
7. Bannuru RR, Osani MC, Vaysbrot EE, et al. OARSI guidelines for the non-surgical management of knee, hip, and polyarticular osteoarthritis. Osteoarthritis Cartilage. 2019;27(11):1578–1589.