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Dietary supplement

Immune Boost Ingredients & Drug Interactions

by Dr. Garber's

Immune Boost label
See full label image
Liquid Category: Other Combinations
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 30, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Immune Boost against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Immune Boost is a dietary supplement by Dr. Garber's with 5 active ingredients. Its ingredients are commonly taken for immune system support, frequent infections, allergies.Based on those ingredients, 259 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Black Currant, Thymus Extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Immune Boost by Dr. Garber's

Ask about any prescription or over-the-counter medication and we check it for interactions with Immune Boost by Dr. Garber's — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Immune Boost by Dr. Garber's

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Aug 6, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 5 active ingredients.
  • “Proprietary Blend” is a proprietary blend — the label gives one combined amount (83 mg) without saying how much of each component you get.

Dr. Garber's Immune Boost is a liquid formula with 5 active ingredients.

The product contains thymus extract (from bovine thymus tissue), black currant seed oil, hedge maple, English walnut, and bornite. It also holds inactive ingredients—glycerin, purified water, and alcohol—which serve as preservatives and solvents in the liquid form.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: optimal immune health.
  • We looked for evidence on: Common cold, Influenza, Respiratory tract infections, Allergic rhinitis (hay fever), Asthma, Food allergies — and 3 related terms.
  • The strongest evidence on file: Thymus Extract is rated "Possibly Effective" for Respiratory tract infections (Natural Medicines).
  • Also on file: Thymus Extract is rated "Insufficient Reliable Evidence To Rate" for Food allergies, Asthma, Allergic rhinitis (hay fever).
  • Also on file: Black Currant is rated "Insufficient Reliable Evidence To Rate" for Influenza, Common cold.

Thymus extract is possibly effective for dilated cardiomyopathy (an enlarged, weakened heart) and respiratory tract infections. Black currant has insufficient evidence for the conditions tested—including Alzheimer disease, liver disease, common cold, cough, eczema, and others.

English walnut is possibly effective for high cholesterol, but evidence is insufficient for coronary heart disease and diabetes. Overall, the evidence for this product's immune-support claims isn't established in the data we hold.

The evidence, ingredient by ingredient Thymus Extract Black Currant English Walnut

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 3 of the 3 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 3 of 3.
  • General safety write-ups exist for 3 of 3.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Thymus extract comes from raw cattle tissue and carries a small contamination risk; the data advises against it during pregnancy and breastfeeding. Black currant as a food is safe, but concentrated supplements lack robust safety data—a small number of trial participants reported mild diarrhea 2–10 days after starting it.

English walnut is likely safe in food amounts but can trigger serious allergic reactions in people with tree nut allergies; concentrated leaf or husk extracts haven't been studied. No safety data are on file for hedge maple or bornite during pregnancy or breastfeeding.

Side effects, ingredient by ingredient Thymus Extract Black Currant English Walnut

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 2 of the 3 matched ingredients can interact with medications — Thymus Extract, Black Currant.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs.
  • For scale: 259 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before taking this product, check with your doctor or pharmacist if you're on immunosuppressants (moderate risk of infection from contaminated thymus extract), blood thinners or antiplatelet drugs like warfarin or aspirin (moderate risk of increased bleeding from black currant), or phenothiazines, an older antipsychotic or anti-nausea class (moderate risk of lower seizure threshold from black currant).

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

This product may appeal to someone looking for immune support from whole-food sources, but the evidence doesn't yet support that claim. If you take immune-suppressing drugs, blood thinners, or antipsychotics, talk with your doctor or pharmacist before starting—interactions are possible.

Anyone with a tree nut allergy should avoid it. Your own doctor or pharmacist can help you decide if it's right for your situation.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 3 of 5 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 23, 2022.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Immune Boost, straight from the product label.

Brand Dr. Garber's
Barcode (UPC) 189806000336
Net contents 2 fl. Oz.; 60 mL
Market status On market
Date entered into DSLD Aug 23, 2022
DSLD ID 268748
Product type Other Combinations
Supplement form Liquid
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Children (All), Gluten Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Immune Boost by Dr. Garber's, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 mL
Maximum serving Sizes:
1 mL
Servings per container
60
UPC/BARCODE
189806000336
IngredientAmount% DV
Proprietary Blend83 mg--
Thymus Extract0 NP--
Black Currant0 NP--
Hedge Maple0 NP--
English Walnut0 NP--
Bornite0 NP--

Other ingredients: Glycerin, Water, Purified, Alcohol

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Precautions

Do not use if imprinted cap seal is broken or missing.

Children should take half the adult amount.

Formulation

GMO free Gluten free

Natural solutions for optimal immune health.

Heal different

Benefit: Supports a healthy immune system; stimulates immune functions.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Seals/Symbols

GMP Good Manufacturing Practice product

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Suggested use: Take 1.0 ml, directly by mouth or in a small amount of water, two or more times a day, as needed. Children should take half the adult amount.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Immune Boost by Dr. Garber's label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Immune Boost label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Immune Boost by Dr. Garber's

These are the 5 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 mL Dosage formLiquid Servings per container60 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Proprietary Blend

83 mg per serving

Other (inactive) ingredients: Glycerin, Water, Purified, Alcohol. These complete the product’s ingredient list but are not active constituents.

Interaction report

Immune Boost by Dr. Garber's Drug Interactions

Want to check YOUR meds against Immune Boost?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
259Drugs
259 Moderate

Ingredients driving the most interactions

Black Currant 140
Thymus Extract 121

Individual Drug Interactions

The ingredients in Immune Boost interact with 259 drugs. Click any drug to see the details.

2 of the 5 ingredients in Immune Boost interact with drugs. Each result below shows which ingredient is responsible. Black Currant Thymus Extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Immune Boost with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.

Black Currant2 drug types · 140 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, black currant seed oil might increase the risk of bleeding if used in combination with anticoagulant or antiplatelet drugs.
Gamma-linolenic acid (GLA), a constituent of black currant seed oil, appears to have antiplatelet effects.

Likelihood Possible Evidence D
Phenothiazines

Theoretically, black currant seed oil might increase the risk of seizure in patients receiving phenothiazines.
Black currant seed oil contains gamma-linolenic acid (GLA). There is some concern that taking supplements containing GLA might cause seizures, or lower the seizure threshold, when taken with phenothiazines, although there is no evidence that black currant seed oil causes seizures. In one report, three patients with schizophrenia who had received phenothiazines developed EEG changes suggestive of temporal lobe epilepsy after starting treatment with GLA, although none experienced an actual seizure. In another report, two patients with schizophrenia who were stabilized on phenothiazines developed seizures when evening primrose 4 grams daily, which contains GLA, was added. One of these patients had a prior history of seizures.

Likelihood Possible Evidence D
Black Currant full monograph & interactions

Thymus Extract1 drug type · 121 drugs

Immunosuppressants

Theoretically, patients taking immunosuppressants may be at an increased risk of infection from contaminated thymus extract.
Thymus extract is derived from raw bovine thymus glands and is at risk for contamination. Tell patients to avoid thymus extract products unless these products are certified as pathogen-free.

Likelihood Possible Evidence D
Thymus Extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Immune Boost, from the product label.

Dr. Garber's

See all Dr. Garber's products
Name
Dr. Garber's LLC
City
Santa Fe
State
NM
ZipCode
87508
Phone Number
877-374-2723
Web Address
www.drgarbers.com
Pharmacist Counseling Corner

Immune Boost by Dr. Garber's: Common Questions

Does Immune Boost by Dr. Garber's interact with any medications?
Yes. Based on its ingredients, Immune Boost has a known interaction with 259 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Immune Boost contains 5 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I take this if I'm on a blood thinner like warfarin?
Not without checking first. Black currant in this product may increase bleeding risk when combined with blood thinners. Talk with your doctor or pharmacist before starting—they know your doses and can tell you if it's safe for you.
Is it safe during pregnancy?
The thymus extract in this product should be avoided during pregnancy according to the safety data. English walnut is likely safe in food amounts, but we don't have pregnancy safety information on file for black currant, hedge maple, or bornite. Talk with your doctor or pharmacist for personalized advice.
What if I have a tree nut allergy?
English walnut can trigger serious allergic reactions in people with tree nut allergies, ranging from itching in your mouth to swelling of the lips and tongue. Avoid this product and talk with your doctor if you have a known tree nut allergy.
Does this actually boost your immune system?
The evidence we hold doesn't support that claim. Thymus extract is possibly effective for respiratory infections and dilated cardiomyopathy, but the other ingredients lack reliable evidence for immune benefits.
What side effects might I notice?
Black currant may cause mild diarrhea, usually 2–10 days after starting. English walnut can soften stools and cause mild bloating; if you're allergic, you might get itching in your mouth or, rarely, swelling of the lips and tongue.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Immune Boost label
Go deeper

The Full Monographs Behind Immune Boost’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Thymus Extract

Interacts with 121 drugs

Thymus extract is a glandular product made from the thymus tissue of animals, and it is promoted mainly for immune support. The evidence is mostly limited, preliminary, or from older studies...

Read the full Thymus Extract monograph → Herb & supplement monograph

Black Currant

Interacts with 140 drugs

Black currant is a nutritious berry that is rich in vitamin C and antioxidants, and its seed oil contains the omega-6 fatty acid GLA. While it is enjoyed safely as a food and is popular as a...

Read the full Black Currant monograph → Herb & supplement monograph

English Walnut

English walnut is a nutritious tree nut rich in plant-based omega-3 fats, fiber, and antioxidants, and eating it as part of a balanced diet may support heart health. Most concentrated supple...

Read the full English Walnut monograph →
Sources

Sources & How We Checked

Immune Boost's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 24 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Thymus Extract 2 references
  1. Lewis CJ. Letter to reiterate certain public health and safety concerns to firms manufacturing or importing dietary supplements that contain specific bovine tissues. FDA. Available at: www.cfsan.fda.gov/~dms/dspltr05.html.
  2. Nationwide alert on hallmark labs injectable adrenal cortex extract. FDA. Available at: www.fda.gov/bbs/topics/NEWS/NEW00539.html

See these in context on the Thymus Extract monograph →

Black Currant 6 references
  1. Guivernau M, Meza N, Barja P, Roman O. Clinical and experimental study on the long-term effect of dietary gamma-linolenic acid on plasma lipids, platelet aggregation, thromboxane formation, and prostacyclin production. Prostaglandins Leukot Essent Fatty A PubMed
  2. Fa-lin Z, Zhen-yu W, Yan H, et al. Efficacy of blackcurrant oil soft capsule, a Chinese herbal drug, in hyperlipidemia treatment. Phytother Res 2010;24 Suppl 2:S209-13. PubMed
  3. Holman CP and Bell AF. A trial of evening primrose oil in the treatment of chronic schizophrenia. J Orhtomolecular Psych 1983;12:302-304.
  4. Vaddadi KS. The use of gamma-linolenic acid and linoleic acid to differentiate between temporal lobe epilepsy and schizophrenia. Prostaglandins Med 1981;6(4):375-379. PubMed
  5. Norred, C. L. and Brinker, F. Potential coagulation effects of preoperative complementary and alternative medicines. Alt Ther 2001;7(6):58-67.
  6. Puri BK. The safety of evening primrose oil in epilepsy. Prostaglandins Leukotrienes Essential Fatty Acids 2007;77:101-3. PubMed

See these in context on the Black Currant monograph →

English Walnut 16 references
  1. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
  2. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  3. Electronic Code of Federal Regulations. Title 21. Part 182 -- Substances Generally Recognized As Safe. Available at: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=182
  4. Zambon D, Sabate J, Munoz S, et al. Substituting walnuts for monounsaturated fat improves the serum lipid profile of hypercholesterolemic men and women. A randomized crossover trial. Ann Intern Med 2000;132:538-46. PubMed
  5. Chisholm A, Mann J, Skeaff M, et al. A diet rich in walnuts favourably influences plasma fatty acid profile in moderately hyperlipidaemic subjects. Eur J Clin Nutr 1998;52:12-6. PubMed
  6. Sabate J, Fraser GE, Burke K, et al. Effects of walnuts on serum lipid levels and blood pressure in normal men. N Engl J Med 1993;328:603-7. PubMed
  7. Feldman EB. The scientific evidence for a beneficial health relationship between walnuts and coronary heart disease. J Nutr 2002;132:1062S-101S. PubMed
  8. Asero R. Detection and clinical characterization of patients with oral allergy syndrome caused by stable allergens in Rosaceae and nuts. Ann Allergy Asthma Immunol 1999;83:377-83. PubMed
  9. Bonamonte D, Foti C, Angelini G. Hyperpigmentation and contact dermatitis due to Juglans regia. Contact Dermatitis 2001;44:101-2. PubMed
  10. Hu FB, Stampfer MJ. Nut consumption and risk of coronary heart disease: a review of epidemiologic evidence. Curr Atheroscler Rep 1999;1:204-9. PubMed
  11. Tapsell LC, Gillen LJ, Patch CS, et al. Including walnuts in a low-fat/modified-fat diet improves HDL cholesterol-to-total cholesterol ratios in patients with type 2 diabetes. Diabetes Care 2004;27:2777-83. PubMed
  12. Rabiei K, Ebrahimzadeh MA, Saeedi M, et al. Effects of a hydroalcoholic extract of Juglans regia (walnut) leaves on blood glucose and major cardiovascular risk factors in type 2 diabetic patients: a double-blind, placebo-controlled clinical trial. BMC Com PubMed
  13. Hosseini S, Jamshidi L, Mehrzadi S, et al. Effects of Juglans regia L. leaf extract on hyperglycemia and lipid profiles in type two diabetic patients: a randomized double-blind, placebo-controlled clinical trial. J Ethnopharmacol. 2014;152(3):451-6. PubMed
  14. FDA. Qualified Health Claims: Letter of Enforcement Discretion - Walnuts and Coronary Heart Disease (Docket No 02P-0292). March 2004. Available at: http://wayback.archive-it.org/7993/20171114183649/https:/www.fda.gov/Food/IngredientsPackagingLabeling/Labe
  15. Food and Drug Administration. Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA); Public Law 108-282, Title II. Accessed on May 19, 2021. Available at: https://www.fda.gov/food/food-allergensgluten-free-guidance-documents-regulatory-infor
  16. Mirzababaei A, Daneshvar M, Abaj F, et al. The Effect of Walnut (Juglans regia) Leaf Extract on Glycemic Control and Lipid Profile in Patients With Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis of Randomized Clinical Trials. Clin Nutr Re

See these in context on the English Walnut monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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