Drug & supplement interaction

Kinetin + Acetaminophen, Aspirin, Caffeine

Acetaminophen, Aspirin, Caffeine brand names: Excedrin Migraine, Excedrin, Excedrin Extra Strength.

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

Kinetin has a moderate interaction with Acetaminophen, Aspirin, Caffeine. In vitro research suggests that kinetin inhibits human platelet aggregation and activation.

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

Kinetin and Acetaminophen, Aspirin, Caffeine

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

Moderate

ANTICOAGULANT/ANTIPLATELET DRUGS

Why this applies to Acetaminophen, Aspirin, Caffeine

Acetaminophen, Aspirin, Caffeine falls under ANTICOAGULANT/ANTIPLATELET DRUGS — the group Kinetin interacts with.

In vitro research suggests that kinetin inhibits human platelet aggregation and activation. Also, evidence from animal research suggests that kinetin prolongs bleeding time. Theoretically, kinetin might increase the risk of bleeding when used with antiplatelet or anticoagulant drugs. Some anticoagulant or antiplatelet drugs include aspirin, clopidogrel (Plavix), dalteparin (Fragmin), enoxaparin (Lovenox), heparin, ticlopidine (Ticlid), warfarin (Coumadin), and others.
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

The piece of this combination that matters here is the aspirin. Aspirin already thins the blood a bit by keeping platelets from clumping together. In lab and animal studies, kinetin seems to do something similar, slowing platelet activity and lengthening bleeding time. Stacked on top of aspirin, the concern is a small added nudge toward easier bleeding, like more bruising, nosebleeds, or bleeding gums.

Now, the honest part: this evidence comes only from test-tube and animal research, so it's theoretical for people. Most kinetin is used in skin creams, not swallowed, and topical use is very unlikely to affect your bleeding. If you're taking an oral kinetin product along with regular aspirin, mention it to your pharmacist or doctor before changing anything.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Hsiao, G., Shen, M. Y., Lin, K. H., Chou, C. Y., Tzu, N. H., Lin, C. H., Chou, D. S., Chen, T. F., and Sheu, J. R. Inhibitory activity of kinetin on free radical formation of activated platelets in vitro and on thrombus formation in vivo. Eur J Pharmacol PubMed
  2. Sheu, J. R., Hsiao, G., Shen, M. Y., Chou, C. Y., Lin, C. H., Chen, T. F., and Chou, D. S. Inhibitory mechanisms of kinetin, a plant growth-promoting hormone, in platelet aggregation. Platelets. 2003;14(3):189-196. 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

Kinetin Also Interacts With Other Medications

Kinetin has 121 moderate known drug interactions in our database — the Acetaminophen, Aspirin, Caffeine one above is one of them. If you take anything else, check it against the full list below.

Moderate 121 No known interaction 2,709 (incl. Acetaminophen, Aspirin, Caffeine)
Taking anything else?

Check Another of Your Medications Against Kinetin

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

Everything else you take

See Every Supplement That Interacts With Acetaminophen, Aspirin, Caffeine

This page covers Kinetin only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Acetaminophen, Aspirin, Caffeine page lists 371 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Asarabacca (major), Beer (major), Danshen (major) and Ephedra (major).

By severity: 13 major · 312 moderate · 46 minor.

From our pharmacist’s overview on the Acetaminophen, Aspirin, Caffeine page

“Excedrin (acetaminophen, aspirin, and caffeine) packs three drugs into one tablet, which multiplies the ways supplements can collide with it, so treat this list with real care. Most entries involve the aspirin: hundreds of herbs add to its blood-thinning effect and raise bleeding risk, and even beer or wine earns a major rating for sto…”

Reviewed by 2 · Jul 18, 2026

Open the Acetaminophen, Aspirin, Caffeine interaction page

How much people look this up

Where Kinetin and Acetaminophen, Aspirin, Caffeine 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 Kinetin
Steady interest

#1,233 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Acetaminophen, Aspirin, Caffeine
Top 10%

#171 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 Kinetin

What is Kinetin?

  • Anti-aging skincare
  • Skin smoothing and texture
  • Reducing skin dryness and roughness
  • Evening skin tone
  • Cosmetic moisturizing

Kinetin is a plant growth hormone (a cytokinin) used mainly in topical anti-aging and skincare products, not as an oral dietary supplement. Early laboratory research and small studies suggest it may help skin texture and hydration, but high-quality human evidence is limited. If you want to try it, use it as a cosmetic skin product and check with a pharmacist or dermatologist, especially if you have sensitive skin.

Read the full Kinetin monograph & all interactions
Keep checking

Other Drugs & Kinetin

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

0Major
121Moderate
0Minor
2,708No known interaction
121 Moderate 2,708 No interaction
Moderate

121 interactions

Showing 60 of 121 moderate interactions — see all 121 on the Kinetin page.

No interaction 2,708 drugs checked — show the list

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

Showing the 60 most looked-up of 2,708 medications checked with no known interaction — see the full Kinetin list.

See the full Kinetin interactions page
See every supplement checked against Acetaminophen, Aspirin, Caffeine, 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
Kinetin monograph › Uses, safety, and every drug interaction in one place Acetaminophen, Aspirin, Caffeine supplement interactions › Every supplement checked against Acetaminophen, Aspirin, Caffeine, ranked by severity 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 Kinetin and Acetaminophen, Aspirin, Caffeine Together: Common Questions

Can you take Kinetin with Acetaminophen, Aspirin, Caffeine?
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 Kinetin and Acetaminophen, Aspirin, Caffeine 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 Acetaminophen, Aspirin, Caffeine and Kinetin?

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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.