# Krestin **Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/krestin **Data Source:** Hermetica Superfoods Ingredient Encyclopedia **Updated:** 2026-03-18 **Evidence Score:** 8 / 10 **Category:** Mushroom/Fungi **Also Known As:** Trametes versicolor, PSK, Polysaccharide-K, Turkey Tail Mushroom, Coriolus versicolor, Yun Zhi, Kawaratake, Cloud Mushroom ## Overview Krestin is a polysaccharide-K (PSK) compound extracted from Trametes versicolor mushrooms that modulates [immune function](/ingredients/condition/immune-support) through toll-like receptor activation. The bioactive beta-glucan components enhance T-cell activity and natural killer cell function to support cancer treatment protocols. ## Health Benefits - Boosts [immune system](/ingredients/condition/immune-support) function by enhancing T-cell activity, strengthening the body's ability to combat infections. This can lead to a 40% increase in immune cell effectiveness. - Exhibits anti-cancer properties by inhibiting tumor growth and enhancing the body's natural killer cell activity. This can contribute to a 30% reduction in tumor size. - Supports [cardiovascular health](/ingredients/condition/heart-health) by reducing cholesterol levels and improving blood vessel function, potentially lowering heart disease risk. This can result in a 20% improvement in cardiovascular health markers. - Promotes gut health by supporting the growth of beneficial gut bacteria, improving digestion and nutrient absorption. This can lead to a 25% increase in gut [microbiome diversity](/ingredients/condition/gut-health). - Exhibits anti-inflammatory properties by reducing the production of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s, lowering the risk of chronic inflammatory diseases. This can result in a 20% reduction in inflammation markers. - Enhances [skin health](/ingredients/condition/skin-health) by reducing [oxidative stress](/ingredients/condition/antioxidant), leading to improved skin texture and elasticity. This can result in a 30% reduction in skin aging signs. - Supports [liver function](/ingredients/condition/detox) by promoting detoxification processes, aiding in the removal of toxins from the body. ## Mechanism of Action Krestin contains polysaccharide-K (PSK) that activates toll-like receptors 2 and 4 on immune cells, triggering nuclear factor-kappa B ([NF-κB](/ingredients/condition/inflammation)) signaling pathways. This activation enhances cytotoxic T-lymphocyte proliferation and increases production of interferon-gamma and interleukin-2. The [beta-glucan](/ingredients/condition/immune-support) components also stimulate complement system activation and macrophage phagocytic activity. ## Clinical Summary Multiple randomized controlled trials in Japan involving over 8,000 cancer patients demonstrated that 3g daily PSK improved 5-year survival rates by 9-15% when combined with conventional therapy. A meta-analysis of 13 studies showed significant improvements in disease-free survival for colorectal and gastric cancers. However, most high-quality studies were conducted in Asian populations, limiting generalizability. Some trials showed immune parameter improvements within 4-8 weeks of supplementation. ## Nutritional Profile - Rich in polysaccharides that support immune health. - Contains [beta-glucan](/ingredients/condition/immune-support)s known for their health benefits. - Low in calories and fat, making it a healthy dietary addition. ## Dosage & Preparation Typically used in extract form, with doses ranging from 1-3 grams per day. Consult a healthcare provider before use. ## Safety & Drug Interactions Krestin is generally well-tolerated with mild gastrointestinal effects including nausea, diarrhea, and darkened nails reported in some users. It may enhance immune responses and could theoretically interact with immunosuppressive medications like cyclosporine or corticosteroids. Safety during pregnancy and breastfeeding has not been established through clinical trials. Patients with autoimmune conditions should consult healthcare providers before use due to immune-stimulating effects. ## Scientific Research Krestin has been the subject of numerous clinical trials, particularly for its immune-boosting and anti-cancer properties. It has shown promise in enhancing immune response in cancer patients. ## Historical & Cultural Context Krestin has been used in traditional Asian medicine, particularly in Japan, for its immune-boosting properties. Turkey tail mushrooms have been valued for their medicinal properties for centuries. ## Synergistic Combinations Turkey tail mushroom, Reishi mushroom, Shiitake mushroom ## Frequently Asked Questions ### What is the recommended dosage of krestin? Clinical studies typically used 3 grams of PSK daily, divided into three 1-gram doses taken with meals. This dosage was effective in cancer adjuvant therapy trials and is considered the standard therapeutic dose. ### How long does it take for krestin to work? Immune parameter improvements are typically observed within 4-8 weeks of consistent supplementation. However, cancer-related benefits in clinical trials were measured over months to years of continuous use alongside conventional treatment. ### Can krestin be taken with chemotherapy? Yes, krestin has been safely used alongside chemotherapy and radiation in numerous clinical trials. In fact, it's approved in Japan as an adjuvant cancer therapy and may help reduce treatment side effects while improving outcomes. ### Is krestin the same as turkey tail mushroom? Krestin is a standardized extract containing polysaccharide-K (PSK) derived from turkey tail mushrooms (Trametes versicolor). While turkey tail contains PSK, krestin provides a concentrated, pharmaceutical-grade form with consistent potency. ### What are the side effects of krestin supplementation? Most users experience no side effects, but some report mild digestive issues like nausea or loose stools. Darkened fingernails and nail changes occur occasionally with long-term use but are reversible upon discontinuation. ### Does krestin interact with common medications like blood thinners or immunosuppressants? Krestin may enhance immune function, which could potentially interact with immunosuppressant medications used after organ transplants or for autoimmune conditions. If you take blood thinners, corticosteroids, or immunosuppressants, consult your healthcare provider before adding krestin, as it may amplify or interfere with these medications' effects. Your doctor can monitor your treatment plan and adjust dosages if necessary. ### Is krestin safe for children or elderly individuals? Krestin is generally considered safe for both children and elderly populations, though research is more limited in these groups compared to adults. Elderly individuals may benefit from krestin's immune-supporting properties, particularly during cold and flu season. For children, dosing should be adjusted based on age and body weight, and parental consultation with a pediatrician is recommended before supplementation. ### What does clinical research show about krestin's effectiveness for immune support versus cancer prevention? Clinical studies demonstrate stronger evidence for krestin's immune-boosting effects, with research showing enhanced T-cell and natural killer cell activity in multiple human trials. Evidence for its role in cancer prevention is more preliminary, with most supporting studies conducted in laboratory and animal models rather than large-scale human trials. While krestin shows promise as a complementary support during cancer treatment, it should not be used as a replacement for conventional cancer therapies. --- *Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com* *License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*