Jarrow Formulas Immune Optimizer is a immune support supplement that boosts your natural defences with a robust PeakO2 mushroom blend and AP-Bio Andrographis paniculata. This vegan, gluten free formula combines six medicinal mushrooms known for immune activity and a clinically studied leaf extract to support balanced immune responses. Jarrow Formulas is trusted for quality, with careful crafting aimed to help you stay well.

Available Sizes & Variants:

90 vcaps Immune Optimizer - convenient daily dose in vegetarian capsules.

Benefits & Features:

• Supports everyday immune function with PeakO2 mushroom blend.
• Three capsules daily deliver 1000 mg PeakO2 mushroom blend and 200 mg AP-Bio Andrographis for a steady immune system booster.
• Andrographis bioactives modulate inflammatory signaling, helping support balanced immune responses and resilience against common seasonal stressors.
• PeakO2 mushrooms include six species that may help immunological surveillance.
• Designed for daily use, the formula fits vegan lifestyle choices while offering reliable support during cold seasons, thanks to clinically studied ingredients and careful sourcing.

Jarrow Formulas Immune Optimizer draws on PeakO2 mushroom blend and AP-Bio Andrographis to offer a genuine immune system booster. PeakO2 brings six mushroom species, rich in beta glucans that support immune surveillance. AP-Bio Andrographis paniculata leaf extract supplies seven bioactives that modulate inflammatory signals for balanced immune responses. The product is vegan, gluten free and non-GMO, produced in dedicated facilities to protect potency and purity, and it pairs nicely with probiotics for gut health. Not a vitamin d supplement, it focuses on mushroom actives with transparent per serving details.

Cordyceps miltaris (Cordyceps) (Mycelial Biomass and Fruit Body), Ganoderma lucidum (Reishi) (Mycelial Biomass and Fruit Body), Pleurotus eryngii (King Trumpet) (Mycelial Biomass and Fruit Body), Lentinula edodes (Shiitake) (Mycelial Biomass and Fruit Body), Hericium erinaceus (Lion's Mane) (Mycelial Biomass and Fruit Body), Trametes versicolor (Turkey Tail) (Mycelial Biomass and Fruit Body), Andrographis Extract (Andrographis paniculata) (Leaf) (AP-Bio®), Microcrystalline cellulose, capsule (hydroxypropylmethylcellulose), myceliated oats, magnesium stearate (vegetable source), silicon dioxide.

• GTIN: 790011350002
• Manufacturer: Jarrow Formulas
• Categories: Best SellersImmune System Vitamins & SupplementsJarrow Formulas
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Take three capsules daily, preferably with food. Store in a cool, dry place. Keep out of reach of children. Consult a healthcare professional before use if you are pregnant, nursing, taking medication, or have a medical condition.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Mushroom Complex (PeakO2)

Mushroom complex means a mix of medicinal fungi that helps normal immune function through bioactive compounds found in the fruiting bodies. This formulation concentrates a broad range of beta-glucans in the PeakO2® blend, boosting the body's natural defences and cellular health support. The product is vegan and gluten-free, aligning with everyday quality practices for plant-based ingredients.

This formula also includes a clinically studied blend of mushrooms intended to deliver a consistent, traceable component profile and to support overall immune resilience as part of a balanced lifestyle.

What Does Mushroom Complex Do?

Mushroom beta-glucans help with immune surveillance and the function of innate immune cells, contributing to normal immune system activity. They also help defend cells against oxidative stress and support general cellular health.

These actions align with EU/UK guidance on nutrient function and regular bodily processes, emphasising normal immune and antioxidant support.

This product is not intended to diagnose, treat, cure, or prevent any disease.

Jarrow Formulas is Welzo chosen for Immune Optimiser because of its long standing commitment to high quality, ethically aligned manufacturing. This brand is recognised for delivering vegan, gluten free and non-GMO formulations, made in facilities that align with careful manufacturing practices to support purity and potency across their range. Our review highlighted the brand's reputation for sourcing clinically studied ingredients like AP-Bio® Andrographis and PeakO2® mushroom blends, showing a clear approach to ingredient quality.

Our medical team checked Jarrow Formulas against Welzo's standards and criteria, confirming solid alignment with our quality expectations and manufacturing philosophy our ingredient quality and purity standards. This brand's long heritage in the supplement sector, paired with really rigorous product design, positions Jarrow Formulas as a reliable partner for Immune Optimiser. The partnership prioritises patient safety, traceability and consistent delivery of the intended blend, making sure solid value for customers seeking dependable immune support. Learn more about our team our medical team as they evaluated this collaboration.