Description
This supplement helps with: joint pain, stiffness, seasonal allergies, skin itching and healthy aging in dogs and cats. MSM provides bioavailable sulfur for cartilage and connective tissue. Quercetin stabilizes mast cells as the natural antihistamine and clears out senescent cells.
How Does MSM/Quercetin Complex Work?
Two complaints that often occur together in dogs and cats are joint pain and skin problems or allergies. This is no coincidence: chronic inflammation is the common denominator in both. MSM/Quercetin Complex tackles this from two sides at the same time.
MSM (methylsulfonylmethane) provides bioavailable sulfur, an essential building block for collagen, cartilage, tendons and skin. Sulphur is essential for the disulfide bridges that give cartilage its strength, and for the synthesis of glutathione, the body’s most powerful antioxidant. At the same time, MSM inhibits NF-kB, the central switch of chronic inflammation, so that it also acts directly as an inflammation modulator.
Quercetin is a bioflavonoid that stabilizes mast cells by blocking calcium influx, the critical step for histamine release in allergic reactions. This makes quercetin mechanistically different from antihistamines: they block histamine after it has already been released, quercetin prevents its release. In addition, quercetin has senolytic effects: it helps clear up senescent cells that drive chronic inflammation.
What does this supplement do?
- Helps with joint pain, stiffness and cartilage wear via sulfur liver
- Supports seasonal allergies, skin itching and histamine-related complaints
- Inhibits chronic inflammation via NF-kB modulation on two complementary pathways
- Helps clean up senescent cells via senolysis for healthy aging
- Supports glutathione synthesis for liver and cell protection
When do you see results?
MSM and quercetin work through two different time scales. From a systems biology point of view, mast cell stabilization by quercetin reacts relatively quickly, while the structural sulfur delivery by MSM for cartilage building takes more time. Two processes, one supplement.
Quercetin begins to stabilize mast cells. Less histamine release noticeable in less itching and redness. MSM starts sulphur supply.
Significantly less itching and allergic reactions. First improvement in joint flexibility. Better coat and skin quality visible.
Significantly fewer allergy symptoms. Better mobility and less stiffness. Senolytic effect of quercetin noticeable in increased vitality.
Daily use structurally maintains cartilage quality, mast cell balance, and cellular health. For allergies and joint complaints long-term supplement.
Don’t see any difference after 6 weeks? Contact us via our app or email, or schedule an intake with integrative veterinarian Stefan Veenstra via NatuurlijkGezondeDieren.nl.
Why NGD Care MSM/Quercetin Complex?
| Characteristic | NGD Care | Medium supplement |
|---|---|---|
| First result | Allergies week 1-2, joints month 1-2 | MSM alone: often only noticeable after 6-8 weeks |
| Mechanism | MSM (nutrient + NF-kB) + quercetin (mast cell + senolysis): four complementary pathways | Single MSM or single quercetin |
| Form of | Liposomal capsule with only active ingredients | Tablet or chew: often 40-70% flavors and fillers |
| Unique synergistic formulation | ✅ Yes — MSM plus quercetin targets joints and allergies at the same time | ❌ Single, only one mechanism |
| Senolysis | ✅ Yes — quercetin clears senescent cells in aging | ❌ Not present in standard joint supplements |
| Scientifically substantiated | ✅ Yes — multiple RCTs and reviews per ingredient | Variable |
| Human Grade quality | ✅ | Often not |
| Green label | ⚠️ In transition to a fully green label | Rarely |
| Free of flavours and fragrances | ✅ | Often not |
| Free from animal by-products | ✅ | Often not |
| Part of systemic protocol | ✅ Yes — Joint Protocol, Skin Protocol and Old Age Protocol | ❌ Individual supplements |
| Developed by veterinarian | ✅ Stefan Veenstra DVM | Rarely |
| Personal guidance | ✅ Intake possible via Naturally Healthy Animals | ❌ Not available |
Comparison based on common MSM and quercetin supplements for dogs and cats on the Dutch market.
Part of a protocol
MSM/Quercetin Complex is part of the Joint Protocol as a structural building material component, the Skin Protocol as a mast cell stabilizer, and the Old Age Protocol as a senolytic component.
[trustindex no-registration=google]Works well with
MSM/Quercetin Complex targets joints and allergies. The supplements below enhance this through additional mechanisms.
MSM provides sulfur as a cofactor for collagen and cartilage matrix. Mobility Support supplies the complete cartilage matrix including growth factors IGF-1 and TGF-beta. Together, the most complete building material support for joints available.
Quercetin inhibits mast cell activation and NF-kB. PEA inhibits pain and inflammation signaling via PPAR-alpha. Boswellia inhibits 5-LOX. Together the broadest natural anti-inflammatory combination for joints and skin.
Omega-3 inhibits the COX pathway and supports the skin barrier via EPA/DHA integration into cell membranes. Quercetin inhibits histamine via mast cell stabilization. Together broad-spectrum approach to allergic skin complaints from two mechanisms.
Quercetin is senolytic and removes senescent cells. Longevity Support activates through NAD+ sirgardens for cellular repair and energy metabolism. Together a complete anti-aging strategy: removing senescent cells and allowing healthy cells to function optimally.
Want to know more about the science behind this supplement?
Stefan Veenstra DVM explains how MSM provides sulfur for cartilage and how quercetin stabilizes mast cells and cleans up senescent cells.
Developed and clinically substantiated by Stefan Veenstra DVM, integrative veterinarian and founder of NGD Care. More about Stefan →
This information is educational in nature and does not replace a veterinary consultation. When used in animals with kidney problems or immunosuppressive therapy, always consult a veterinarian.

Evelyn de Jong –
Boca heeft na een oorontsteking deze pillen 2x per dag om hooikoorts tegen te gaan en het helpt gweldig.