Green Tea Extract + Tripterygium Wilfordii Root Extract + Vitamin D3 (Cholecalciferol) is a botanical–vitamin combination that includes green tea extract (a source of polyphenolic catechins), Tripterygium wilfordii root extract (a traditional Chinese herbal preparation), and Vitamin D3 (cholecalciferol), which supports calcium absorption, bone mineralisation, and immune regulation. It is taken as an adjunct in inflammatory joint conditions and to address vitamin D insufficiency in patients with these conditions. Because Tripterygium wilfordii has a narrow safety margin, this combination should be used strictly under medical supervision with appropriate lab monitoring.

Persistent joint pain and inflammation, particularly in rheumatoid arthritis, are often accompanied by low vitamin D status, increased oxidative stress, and chronic immune activation. This supplement combines three components that act on different but overlapping pathways.

Green tea extract is standardised for polyphenolic catechins, with epigallocatechin gallate (EGCG) being the most abundant and most studied. Catechins are direct antioxidants and have been investigated for their effects on inflammatory signalling pathways. Notably, high-dose green tea extract supplements have been associated with rare but serious liver injury, an important consideration in long-term or combination use.

Tripterygium wilfordii (TwHF), known as thunder god vine, has been used in Traditional Chinese Medicine for centuries for joint and skin disorders. Standardised root extracts contain bioactive diterpenoids and triterpenoids, particularly triptolide and celastrol, with documented immunomodulatory activity. However, the same compounds carry well-documented risks: reproductive toxicity in both sexes, hepatotoxicity, bone marrow suppression, and gastrointestinal upset. Its therapeutic window is narrow, which is why baseline and follow-up testing are so important.

Vitamin D3 is the form synthesised in skin on sunlight exposure and obtained from animal foods. It is converted in the liver to 25-hydroxyvitamin D and then in the kidney to calcitriol, the active form, which drives intestinal calcium absorption, supports bone mineralisation, and helps regulate the immune system. Vitamin D insufficiency is common in people with chronic inflammatory disease and limited sun exposure.

• As an adjunct in inflammatory joint conditions such as rheumatoid arthritis, under specialist supervision.

• To address vitamin D deficiency or insufficiency in patients with joint or inflammatory conditions.

• To supply standardised green tea polyphenols as part of a broader nutritional strategy.

• Strictly as directed by a qualified healthcare professional, with baseline and follow-up monitoring.

• Vitamin D3 supports calcium absorption, bone mineralisation, and normal immune function.

• Green tea catechins contribute antioxidant capacity, which has been investigated in chronic inflammatory states.

• Standardised Tripterygium wilfordii extract has been investigated as an adjunct in rheumatoid arthritis in clinical research, including alongside conventional disease-modifying therapy.

• A single supplement supports adherence when the combination is medically indicated.

• Encourages a structured monitoring approach because of TwHF's safety profile.

Common

• Nausea, indigestion, or mild stomach upset
• Loss of appetite
• Loose stools or constipation
• Headache

Uncommon

• Skin rash or pigmentary changes
• Hair thinning (reported with TwHF)
• Menstrual irregularities (due to TwHF)
• Mouth ulcers
• Dry mouth

Serious side effects requiring immediate attention

• Liver injury, which may manifest as yellowing of skin or eyes, dark urine, severe fatigue, and right upper abdominal pain, and is usually reported with both high-dose green tea extract and TwHF
• Bone marrow suppression with TwHF, which may present as easy bruising, unexplained bleeding, frequent infections, and severe tiredness
• Reduced fertility, amenorrhoea, or menstrual disturbance in women, and reduced sperm parameters in men (TwHF)
• Vitamin D toxicity from chronic high-dose use (nausea, vomiting, excessive thirst, frequent urination, confusion)
• Severe allergic reaction (rash, swelling, breathing difficulty)
• Cardiac symptoms (palpitations, chest discomfort), often reported with TwHF in case reports

Take Green Tea Extract + Tripterygium Wilfordii Root Extract + Vitamin D3 (Cholecalciferol) orally with a meal containing some fat, which improves vitamin D3 absorption, as prescribed by your doctor. Swallow the medication whole with water. Do not crush or chew unless advised. Further, you must not exceed the prescribed dose or extend the duration of use without consulting your doctor. Baseline and periodic monitoring of liver function tests, complete blood count, and (where relevant) reproductive parameters is appropriate during longer use because of the Tripterygium component. Keep your doctor informed of any new medicines, supplements, or symptoms during treatment

Vitamin D3 is converted in the liver to 25-hydroxyvitamin D (the form measured on blood tests) and then in the kidney to calcitriol, its active form. Calcitriol binds the vitamin D receptor in the gut to drive active calcium absorption, in the kidney to support reabsorption, in bone to support normal remodelling, and in immune cells to help regulate inflammatory responses.

Green tea catechins, particularly EGCG, are direct antioxidants that scavenge reactive oxygen species. In laboratory and clinical research, they have been described as modulating inflammatory signalling pathways such as NF-κB and the activity of several cytokines involved in chronic inflammation. The clinical relevance of these effects from supplement use is still being investigated.

Tripterygium wilfordii contains active compounds called triptolide and celastrol. In laboratory and clinical research, these molecules have been shown to calm down overactive immune cells (T cells), lower the levels of pro-inflammatory chemical messengers like TNF-α, IL-1, and IL-6, and reduce inflammation inside the joint lining. This is why TwHF has been investigated as an add-on treatment in rheumatoid arthritis. The catch is that the same compounds also act on fast-dividing cells in the liver, bone marrow, and reproductive organs — which means the dose that helps and the dose that harms are very close together.

• Meals containing some fat (BENEFICIAL): Vitamin D3 is a fat-soluble vitamin. Taking it with a meal rich in fat, such as eggs, nuts, avocado, dairy, and ghee, improves its absorption from the gut.

• Iron-rich foods or iron supplements (CAUTION): Green tea catechins can reduce iron absorption. Separate the supplements by at least 1 hour.

• Grapefruit and grapefruit juice (CAUTION): May inhibit CYP3A4-mediated metabolism of TwHF compounds, potentially increasing systemic exposure and toxicity risk. Best avoided during treatment.

• Large amounts of caffeinated beverages (CAUTION): Can compound the caffeine in some green tea extracts, increasing the risk of jitteriness or sleep disturbance.

• Methotrexate and other DMARDs (CAUTION): TwHF has been studied alongside methotrexate in randomised research, which compared TwHF with methotrexate in active rheumatoid arthritis. But such combinations require close monitoring for additive liver, bone marrow, and gastrointestinal toxicity.

• Anticoagulants such as warfarin (CAUTION): Green tea contains vitamin K, which may affect INR (how long it takes to form a blood clot). Further, TwHF can affect platelets.

• Other hepatotoxic drugs (CAUTION): Additive risk of liver injury.

• Immunosuppressants (CAUTION): They increase the risk of additional immunosuppression due to TwHF.

• Thiazide diuretics (CAUTION): Green Tea Extract + Tripterygium Wilfordii Root Extract + Vitamin D3 (Cholecalciferol), when combined with high-dose vitamin D, increases the risk of hypercalcaemia.

• CYP3A4 substrates (CAUTION): TwHF can affect drug metabolism via hepatic CYP enzymes.

• Liver disease (CAUTION/CONTRAINDICATED): Both high-dose green tea extract and TwHF have been associated with liver injury.

• Bone marrow suppression or pre-existing cytopenias (CONTRAINDICATED): TwHF can suppress bone marrow.

• Pregnancy or planning conception (CONTRAINDICATED): TwHF has reproductive toxicity concerns.

• Hypercalcaemia, sarcoidosis, or granulomatous diseases (CAUTION/CONTRAINDICATED): Additional vitamin D can worsen hypercalcaemia.

• Cardiac disease (CAUTION): TwHF has been associated with cardiac effects in case reports.

Overdose of Green Tea Extract + Tripterygium Wilfordii Root Extract + Vitamin D3 (Cholecalciferol) can cause vitamin D toxicity (hypercalcaemia), which presents as nausea, vomiting, dehydration, confusion, and, in some cases, kidney injury. Overdose of green tea extracts may result in severe gastrointestinal upset and acute liver injury. TwHF toxicity is the most serious concern and may include bone marrow suppression, severe liver injury, cardiac effects, and reproductive harm. If an overdose is suspected, consult with a medical professional immediately.

If you miss a dose, take it as soon as you remember on the same day with a meal. If the missed dose of Green Tea Extract + Tripterygium Wilfordii Root Extract + Vitamin D3 (Cholecalciferol) is close to the next dose, skip it and continue with your regular schedule. Do not double the dose, particularly because of TwHF's narrow therapeutic window.