Drug & supplement interaction

Shark Cartilage + Palivizumab

Palivizumab brand name: Synagis.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Shark Cartilage has a moderate interaction with Palivizumab. Theoretically, shark cartilage might interfere with immunosuppressive therapy.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Shark Cartilage and Palivizumab

Here is the interaction we found between these two, with the evidence behind it.

Moderate

IMMUNOSUPPRESSANTS

Why this applies to Palivizumab

Palivizumab falls under IMMUNOSUPPRESSANTS — the group Shark Cartilage interacts with.

Theoretically, shark cartilage might interfere with immunosuppressive therapy.
In vitro evidence suggests that shark cartilage might stimulate immune responses. This effect has not been reported in humans.
Severity Moderate Likelihood Possible Evidence D

Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the short version on giving shark cartilage alongside Synagis (palivizumab). Palivizumab is a lab-made antibody given as a shot to help prevent RSV lung infections in high-risk babies. It works by lending the immune system ready-made protection against the virus, so anything that nudges the immune system could, in theory, change how it behaves.

The concern on file is purely theoretical. In test-tube studies, shark cartilage seemed to rev up immune activity, but this has never actually been seen in people, and it has not been shown to weaken palivizumab's protection. I'd add that shark cartilage isn't recommended in the first place. Since this involves a child and an injectable medicine, please run it by your pediatrician or pharmacist before using any supplement.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Merly, L., Simjee, S., and Smith, S. L. Induction of inflammatory cytokines by cartilage extracts. Int Immunopharmacol. 2007;7(3):383-391. PubMed
  2. Bargahi, A., Hassan, Z. M., Rabbani, A., Langroudi, L., Noori, S. H., and Safari, E. Effect of shark cartilage derived protein on the NK cells activity. Immunopharmacol.Immunotoxicol. 2011;33(3):403-409. PubMed
  3. Merly L, Smith SL. Pro-inflammatory properties of shark cartilage supplement. Immunopharmacol Immunotoxicol. 2015;37(2):140-7. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Shark Cartilage Also Interacts With Other Medications

Shark Cartilage has 120 moderate known drug interactions in our database — the Palivizumab one above is one of them. If you take anything else, check it against the full list below.

Moderate 120 No known interaction 2,710 (incl. Palivizumab)
Taking anything else?

Check Another of Your Medications Against Shark Cartilage

Covers the 2,830 medications we’ve checked against Shark Cartilage. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Palivizumab

This page covers Shark Cartilage only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Palivizumab page lists 53 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Active Hexose Correlated Compound (ahcc) (moderate), Alfalfa (moderate), American Ginseng (moderate), Andrographis (moderate) and Ashwagandha (moderate).

By severity: 52 moderate · 1 minor.

From our pharmacist’s overview on the Palivizumab page

“Everything on this list for palivizumab (Synagis), the antibody injection given monthly to shield premature and other high-risk infants from RSV, points in one direction. These are supplements that stimulate the immune system, and stimulating the immune system could in theory work against a medicine that acts on it.”

Reviewed by 2 · Jul 18, 2026

Open the Palivizumab interaction page

One more smart check

Taking Shark Cartilage as Part of a Dietary Supplement Product? Check It for Interactions

We hold 2 real supplement products containing Shark Cartilage, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Shark Cartilage. Your product may carry other ingredients that interact with Palivizumab too, on top of Shark Cartilage — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Shark Cartilage and Palivizumab Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Shark Cartilage
Steady interest

#1,306 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Palivizumab
Top half

#1,347 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Supplement

About Shark Cartilage

What is Shark Cartilage?

  • Cancer support (popular use)
  • Arthritis and joint pain
  • Psoriasis
  • Wound healing
  • General immune support

Shark cartilage is a supplement made from the skeletal tissue of sharks that was heavily promoted for cancer and joint conditions, but good-quality clinical trials have not shown meaningful benefit. It is generally not recommended, and there are real environmental and safety concerns, so talk with your doctor or pharmacist before considering it.

Read the full Shark Cartilage monograph & all interactions
Medication

About Palivizumab Injection

What Is Palivizumab Injection Used For?

Brand name: Synagis

Synagis (palivizumab) is used to prevent serious lower respiratory tract disease caused by RSV — not to treat an infection that has already started. It is given to high-risk babies and young children before and during RSV season.

Synagis is approved for infants born at 35 weeks gestation or earlier who are 6 months old or younger at the start of RSV season; children up to 24 months old with bronchopulmonary dysplasia (BPD, a chronic lung condition) who needed medical treatment in the past 6 months; and children up to 24 months old with hemodynamically significant congenital heart disease (a heart defect that affects blood flow).

See full Palivizumab Injection drug information
Keep checking

Other Drugs & Shark Cartilage

Browse every other medication we’ve checked against Shark Cartilage — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
120Moderate
0Minor
2,709No known interaction
120 Moderate 2,709 No interaction
Moderate

120 interactions

Showing 60 of 120 moderate interactions — see all 120 on the Shark Cartilage page.

No interaction 2,709 drugs checked — show the list

We also checked Shark Cartilage against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,709 medications checked with no known interaction — see the full Shark Cartilage list.

See the full Shark Cartilage interactions page
See every supplement checked against Palivizumab, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

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

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

Keep exploring
Shark Cartilage monograph › Uses, safety, and every drug interaction in one place Palivizumab supplement interactions › Every supplement checked against Palivizumab, ranked by severity Palivizumab Injection drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Shark Cartilage and Palivizumab Together: Common Questions

Can you take Shark Cartilage with Palivizumab?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Shark Cartilage and Palivizumab interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Palivizumab and Shark Cartilage?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.