The Joints Research Hub

Cartilage has no blood supply. This single fact explains most of what is counterintuitive about joint health.

Every other tissue receives nutrients through capillaries. Cartilage does not. It is nourished by synovial fluid, and that fluid is driven into the cartilage matrix by compression. The joint is loaded, fluid is pressed in, the load is released, fluid flows back out carrying waste. Movement is not merely tolerated by cartilage. It is the mechanism by which cartilage is fed.

The intuitive response to an aching joint is to rest it. Rest reduces the loading cycles that deliver nutrition to the tissue. Over time, unloaded cartilage thins. This is why prolonged immobilisation degrades joints and why the fear that exercise wears them out inverts the actual relationship in most circumstances.

Menopause adds a second factor. Oestrogen receptors are present in cartilage and in the synovium, and falling oestrogen is associated with changes in cartilage turnover and with increased inflammatory signalling. Stiffness after menopause is not imagined and not simply the accumulation of years.

Why joints are a connective tissue system

A joint is not only cartilage. It is cartilage, the collagen-rich capsule and ligaments that hold it, the tendons that transmit force across it, and the muscles that control how force arrives.

Type II collagen predominates in cartilage, type I in tendon and ligament. Collagen synthesis requires vitamin C as an enzymatic cofactor. Without it the molecule cannot be cross-linked correctly, and the resulting tissue is mechanically inferior. Several trace minerals, including copper and manganese, participate in the enzymes that assemble and stabilise the collagen matrix.

This is why joint comfort responds poorly to single-ingredient thinking. The tissue is a composite, built by enzymes that require cofactors, maintained by loading, and controlled by the muscle around it. Strengthening that muscle reduces the peak force the cartilage absorbs. Nutrition supplies what the tissue is built from. Neither addresses the other's function.

How Silvie evaluates the evidence

We select ingredients by form, not only by name. The form determines how much of a nutrient reaches the tissue that needs it, and two products naming the same compound can differ substantially in what the body absorbs. Where a specific form has been used in the human trials, that is the form we use.

We dose to the levels tested in those published trials rather than to the smallest quantity that permits a claim on the label. A dose below the studied range is not a smaller version of the same effect. Often it is no effect at all.

We prioritise human studies. Mechanistic and animal research is useful for understanding why something might work, but it is not evidence that it does. Where the human evidence is mixed, preliminary or limited to a narrow population, we say so in the article rather than omitting it from the marketing.

We are also clear about what supplementation cannot do. Nutrition supplies the components of connective tissue. Loading delivers nutrition to cartilage and builds the muscle that protects it. No formulation substitutes for movement.

You can read how we assess evidence, select ingredient forms and set doses in our approach to research.