4.8/5 based on 137,135 reviews

Good Kidney Health Is Just A Bottle Away.

30-Day Money-Back Guarantee

Excellent 4.7 out of 5

Resorin Kidney Function Support with Elderberry, Zinc & Vitamin C

  • Helps restore insulin sensitivity and stabilize blood sugar naturally
  • Repairs gut lining damage from emulsifiers in processed foods
  • Supports gut health and promotes gentle, natural regularity
  • Restores the bacterial signal your gut needs to move waste naturally

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One Berry. Four Powerful Compounds.

Elderberry Extract

Elderberry Extract

1,200mg per serving of cold-extracted Sambucus nigra — one of the most studied botanicals for kidney and immune support, used for over 2,000 years in traditional medicine to support filtration and fluid balance.

Anthocyanins (C3G)

Anthocyanins (C3G)

Elderberry's signature active compound, cyanidin-3-glucoside is the bioactive behind its kidney research — binding to glomerular capillaries, neutralizing oxidative stress, and supporting nephron repair at the cellular level.

Zinc Citrate

Zinc Citrate

Naturally deficient in most CKD patients, zinc plays a critical role in kidney cell repair and immune regulation. Resorin uses zinc citrate — the most bioavailable form — to restore what CKD depletes.

Buffered Vitamin C

Buffered Vitamin C

Standard vitamin C can stress compromised kidneys. Resorin uses a buffered form that delivers antioxidant protection and collagen synthesis support without the oxalate load that damages kidney tissue.

What Our Customers Say

4.8/5 based on 1,250+ customer reviews

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Expert Advice from Dr. Steven Chen, Integrative Medicine & Immune Health Specialist

"Your immune resilience and metabolic health depend on balanced cellular signaling and proper nutrient support. When chronic inflammation, insulin resistance, or immune dysfunction overwhelm your system, even the healthiest lifestyle can leave you feeling exhausted, sick, or stuck. Tonava's elderberry formula offers a natural, science-backed approach that supports immune modulation, restores cellular glucose uptake, and calms inflammatory pathways without harsh side effects or overstimulation. It's a safe, daily way to restore vitality, metabolic balance, and immune confidence."

We're serious about clean health, ask away

Transparency matters when it comes to daily supplements. Below you'll find answers to the most common questions about our elderberry supplement

How do I take Resorin capsules? +

Take 2 capsules daily with food and water. For general maintenance and immune support, take 2 capsules once daily, preferably with breakfast or lunch. At the first signs of illness (sore throat, fatigue, etc.), you may take 2 capsules twice daily (morning and evening) for 3-7 days for acute support, then return to the maintenance dose. Do not exceed 4 capsules per day without consulting a healthcare professional.

Can I take it with other medications or supplements? +

Tonava can generally be taken alongside most vitamins and supplements. However, if you are taking:

  • Immunosuppressant medications (e.g., for organ transplants or autoimmune conditions): consult your doctor, as elderberry may modulate immune function
  • Diabetes medications: monitor blood sugar closely, as elderberry may improve insulin sensitivity
  • Diuretics: elderberry has mild diuretic effects; consult your healthcare provider
  • Blood thinners: vitamin C in high doses may interact; stay within recommended dosage

Always separate Tonava from tetracycline or quinolone antibiotics by at least 2 hours, as zinc can reduce their absorption

What are the possible side effects? +

Resorin is generally well-tolerated with minimal side effects when taken as directed. Some users may experience mild digestive changes as their gut microbiome adjusts (this typically resolves within a few days). High doses of zinc (above the recommended amount) may cause nausea or metallic taste—stick to the suggested 2-4 capsules per day. If you experience any unusual symptoms, discontinue use and consult a healthcare professional.

Who should avoid using Resorin? +

Many customers take Resorin alongside their medications without issues, but you should always consult your doctor first. Aged garlic is generally well-tolerated, but your healthcare provider needs to monitor your numbers as they may improve and require medication adjustments.

What's your money-back guarantee? I've wasted money on supplements that didn't work before. +

We offer a 30-day money-back guarantee because we're confident in Elderberry Formula. If you don't see improvements within 30 days, simply return the bottles (even if empty) for a full refund. No questions asked.

★★★★★ Rated 4.9 / 5 | Trusted by 10,000+

They Felt the Shift. You Will Too.

5.0 ★★★★★

My eGFR went from 41 to 56 in 90 days.

I've been watching my eGFR decline for 4 years. My nephrologist told me to 'just monitor it.' I started Resorin® and at my next lab check my number had jumped 15 points. I cried in the parking lot.

eGFR Improvement Kidney Filtration
5.0 ★★★★★

The swelling in my ankles is finally gone.

I had to stop wearing my regular shoes because my ankles were so swollen by afternoon. Within 3 weeks of taking Resorin® every morning, the puffiness was noticeably better. My husband noticed before I did.

Fluid Balance Swelling Relief
5.0 ★★★★★

Part of my kidney routine now. Non-negotiable.

I take Resorin® every single morning with my other medications. My nephrologist has no objection and my last two lab results have been the most stable in years. I'm not stopping.

Daily Support Long-Term Results
5.0 ★★★★★

Subtle at first, but my labs tell the story.

The first month I wasn't sure. By month three my creatinine had dropped and my eGFR was up 11 points. I have more energy, less brain fog, and I sleep through the night. It works quietly but it works.

Creatinine Support Energy & Clarity