Rejuv’s Immune Boost: Unlocking Everyday Immunity with Botanicals and Nutrients for Immune Balance

The past week has truly tested my family's resilience. All three kids and my husband, Dirk, have been battling an aggressive COVID-related flu strain, with antibiotics and hospital visits all part of our reality. All while far from home in remote Africa on holiday!

As a clinician and mum, these moments serve as a powerful reminder: no one is immune to life's health curveballs. What matters most is how we prepare, respond, and support our bodies with evidence-backed nutrition, lifestyle, and targeted supplements.

I'm thrilled to report that my whole family is now on the mend! This experience inspired me to share the science and insights behind the Rejuv Immune Boost Pack—the go-to supplement for my family. Strategic nutrition empowers you to protect yourself and your loved ones, no matter what challenges arise.

Key Ingredients: Science-Backed Choices for Immune Support

• Immune Support Capsules: acerola cherry, parsley leaf, blackcurrant extract, rosehip, elderberry¹
• Prebiotic Immune Complex: psyllium husk, flaxseed, fenugreek, apple pectin, rhubarb, beet fibre, prune, broccoli, carrot, fig, fennel²
• Organic Turmeric Blend: turmeric powder and extract, ginger, cayenne, piperine, zinc, B6³
• Immune Restore Complex: vitamin C (acerola), baobab, zinc, vitamin E, Lactobacillus acidophilus, astragalus, reishi, olive leaf, garlic, selenium, turmeric, elderberry, & more¹

The art of crafting an immune formula lies in carefully selecting scientifically validated ingredients. Let’s take a closer look at how each key ingredient is supported by research and why it matters for your immune resilience.

Elderberry (Sambucus nigra)

Formula Role: Featured in both Immune Support Capsules and Restore Complex.
Science Says:

• Clinical trials show that elderberry extracts can shorten the duration and reduce the severity of flu symptoms compared with a placebo ⁴.
• Laboratory studies reveal elderberry’s extracts stimulate immune signalling and help monocytes produce cytokines ⁵.
• Systematic reviews consider it safe, with a call for higher-quality data ⁶.

Elderberry stands out as one of the most evidence-backed botanicals for supporting the upper respiratory immune system, making it a smart choice for seasonal support.

Black (Aged) Garlic

Formula Role: Immune Restore Complex.
Science Says:

• Black garlic, enriched by natural aging, provides higher antioxidant and immune-supporting compounds than regular garlic ⁷.
• Studies show benefits in enhancing natural killer (NK) cell function and modulating key immune cytokines ⁸.
• Unique “melanoidins” from aging may boost gut microbial diversity ⁹.
• Sulphur compounds have broad immunomodulatory and anti-inflammatory effects ¹⁰.

Thoughtfully included, aged garlic supports both gut–immune axis and immune modulation—exactly what a modern formula needs.

Astragalus (Astragalus membranaceus)

Formula Role: Immune Restore Complex.
Science Says:

• Astragalus polysaccharides regulate immune balance and dampen excess inflammation ¹¹.
• Clinical data show reduced hypersensitivity and broad immune modulation ¹².
• Shows positive results as an adjunct to immune-supportive treatments in complementary medicine ¹³.

Astragalus is a time-tested adaptogen, supporting both activation and balance in your immune system.

Zinc, Selenium, Vitamin C, E, D & Co-nutrients

Formula Role: Present in Turmeric Blend (zinc, B6) & Restore Complex.
Science Says:

• Zinc: Essential for immune cell development, T-cell function, and antiviral defence ¹⁴.
• Selenium: Vital in antioxidant enzymes; low levels correlate with reduced antiviral immunity ¹⁵.
• Vitamin C: Supports barrier integrity and leukocyte function ¹⁴.
• Vitamin E: Helps regulate oxidative stress and supports adaptive immunity ¹⁴.
• Vitamin D: Universally recommended for its immunoregulatory roles (though not explicitly listed in formula) ¹⁴.

Botanical and micronutrient synergy ensures comprehensive support—covering both the foundational and advanced needs of your immune system.

Prebiotic Fibre & Gut-Immune Support

Formula Role: Prebiotic Immune Complex.
Science Says:

• Fibres like pectin and inulin feed beneficial gut microbes, which produce short-chain fatty acids (SCFAs) that regulate immune function and reduce inflammation¹⁴.
• Prebiotics support barrier integrity and immune resilience via the gut-immune axis¹⁴.
• Flaxseed and other fibres deliver antioxidant phytonutrients¹⁴.

This formula invests in "the soil"—your microbiome—not just the "soldiers" of your immune defense.

Why Synergy Matters More Than Isolated Ingredients

1. Combines nutrients and botanicals for optimal action.
2. Balances activation and regulation for smart immune support.
3. Includes gut support: training ground for healthy immunity.
4. Sources nutrients from whole-food, phytonutrient-rich plants. 

Caveats & Clinical Advice 

• Botanicals like elderberry show promise but should not be overhyped—evidence is encouraging yet limited ⁶.
• Herbal supplements may interact with medications—consult with your healthcare professional.
• Quality, dosage, and extraction methods impact efficacy (not all elderberry or astragalus is equal).
• Supplements are supportive, not substitutes: continue to prioritise vaccination, hygiene, sleep, nutrition, and medical care.

The Rejuv Immune Boost—Key Points

• Combines botanicals, minerals, and gut-supporting fibres for true immune resilience.
• Elderberry, astragalus, and black garlic—each supported by clinical and animal studies for their multifunctional benefits.
• Zinc, selenium, and vitamins C/E—core micronutrients for efficient immunity.
• Diverse fibres foster a resilient microbiome, the foundation of long-term health.
• Designed for synergy—so each ingredient works smarter, not harder.

1. Rejuv Wellness Immune Boost Pack, Product Information, Rejuv Wellness® website
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3. Hewlings SJ, Kalman DS. "Curcumin: A Review of Its' Effects on Human Health." Foods 2017;6(10):92. MDPI
4. Tiralongo E et al. "Elderberry Supplementation Reduces Cold Duration and Symptoms." Nutrients 2016;8(4):182. PMC
5. Barak V et al. "The effect of sambucol, a black elderberry-based, natural product, on the production of human cytokines." European Cytokine Network 2001;12(2):290-296. PMC
6. Hawkins J et al. "The safety and efficacy of elderberry supplements for respiratory health." Complement Ther Med. 2021 Jun;58:102682. PubMed PMID: 33827515
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9. Cao CP et al. "Impact of melanoidins from black garlic on gut microbiota." Foods 2024;12(10):2004. MDPI
10. Bayan L et al. "Garlic: A Review of Potential Therapeutic Effects." Pflügers Archiv 2014;466(2):399-405. Frontiers
11. Wang Z et al. "Astragalus polysaccharides reduce inflammation and modulate immune signaling." Frontiers in Pharmacology 2025;1585697. Frontiers
12. Biogena AG. "Study: Astragalus helps keep our immune system on an even keel." biogena.com
13. Ma X et al. "The antitumor effects of astragalus membranaceus in immunotherapy." International Journal of Functional Nutrition 2023;4(2):31. Spandidos Publications
14. Maggini S et al. "Selected vitamins and trace elements support immune system function— PubMed Review" PMC 2023;10321448. PMC
15. Hiffler L et al. "Selenium and viral infection: are there lessons for COVID-19?" ScienceDirect 2022. ScienceDirect