Drug & supplement interaction

Fulvic Acid + Megestrol Acetate

Megestrol Acetate brand names: Megestrol, Megace.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Fulvic Acid and Megestrol Acetate in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Fulvic Acid and Megestrol Acetate

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Megestrol Acetate and Fulvic Acid in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Fulvic Acid safety at a glance

Fulvic Acid overall Use caution Short-term use appears generally tolerated, but high-quality safety data in humans is limited.
Pregnancy Avoid There is not enough safety information, so avoid use during pregnancy.
Breastfeeding Avoid There is not enough safety information, so avoid use while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Megestrol Acetate and Fulvic Acid? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Megestrol Acetate

Interactions in our licensed database are recorded against drug classes, not just single drug names. Megestrol Acetate is filed under 2 classifications — progestin, oral drugs. Fulvic Acid has documented interactions with 3 drug classes — the most serious being anticoagulant/antiplatelet drugs (moderate), immunosuppressants (moderate) and thyroid hormone (moderate) — and none of Megestrol Acetate’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Fulvic Acid Does Interact With Other Medications

Fulvic Acid has 257 moderate known drug interactions in our database — Megestrol Acetate isn’t one of them. If you take anything else, check it against the full list below.

Moderate 257 No known interaction 2,573 (incl. Megestrol Acetate)
Taking anything else?

Check Another of Your Medications Against Fulvic Acid

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

What to actually watch for

No Interaction Found — But Data Suggests Fulvic Acid and Megestrol Acetate May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Sore throat / Diarrhea Additional detail

    Fulvic Acid

    “In one clinical trial, fulvic acid 3.8% 40 mL taken orally twice daily resulted in diarrhea and sore throat in some patients.”

    Fulvic Acid · Natural Medicines adverse-effect record, reported in diarrhea.

    1 source cited
    1. 90589. Gandy JJ, Meeding JP, Snyman JR, et al. Phase 1 clinical study of the acute and subacute safety and proof-of-concept efficacy of carbohydrate-derived fulvic acid. Clin Pharmacol. 2012;4:7-11. PubMed

    Megestrol Acetate

    Listed in the ADVERSE REACTIONS section of the FDA label for Megestrol Acetate. Read the label on DailyMed ›

  • Headache Additional detail

    Fulvic Acid

    “In one clinical trial, fulvic acid 3.8% 40 mL taken orally twice daily resulted in headache in some patients.”

    Fulvic Acid · Natural Medicines adverse-effect record, reported in cluster headache.

    1 source cited
    1. 90589. Gandy JJ, Meeding JP, Snyman JR, et al. Phase 1 clinical study of the acute and subacute safety and proof-of-concept efficacy of carbohydrate-derived fulvic acid. Clin Pharmacol. 2012;4:7-11. PubMed

    Megestrol Acetate

    Listed in the ADVERSE REACTIONS section of the FDA label for Megestrol Acetate. Read the label on DailyMed ›

Effects for Megestrol Acetate come from the ADVERSE REACTIONS section of its FDA label; effects for Fulvic Acid come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Overlapping uses

What Megestrol Acetate Is Prescribed For, and What Fulvic Acid Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Megestrol Acetate is a prescription medicine with approved uses on its FDA label. Fulvic Acid is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Megestrol Acetate is prescribed for: Megestrol acetate is used for two distinct purposes depending on the formulation. Megestrol Acetate oral suspension is indicated for treating anorexia (loss of appetite), cachexia (severe weight loss and muscle wasting), or unexplained significant weight loss in patients with a diagnosis of AIDS. Megestrol Acetate tablets are used for the palliative treatment — meaning to ease symptoms, not cure — of advanced breast cancer or endometrial (uterine lining) cancer that is recurrent, inoperable, or has spread to other parts of the body. Tablets are not a replacement for surgery, radiation, or chemotherapy.

Fulvic Acid has been studied for:

  • Cancer studied, not established Fulvic Acid has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Fulvic Acid for cancer

    Although there has been interest in using oral fulvic acid for cancer, there is insufficient reliable information about the clinical effects of fulvic acid for this purpose.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Megestrol Acetate on your own; if you are taking Fulvic Acid for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

Everything else you take

See Every Supplement That Interacts With Megestrol Acetate

This page covers Fulvic Acid only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Megestrol Acetate page lists 18 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 8 moderate · 9 minor.

From our pharmacist’s overview on the Megestrol Acetate page

“Megestrol acetate (Megace) is usually prescribed to restore appetite and weight in people who are seriously ill, so the drug only helps if it actually gets absorbed. That is exactly where this list earns real caution.”

Reviewed by 2 · Jul 18, 2026

Open the Megestrol Acetate interaction page

One more smart check

Taking Fulvic Acid as Part of a Dietary Supplement Product? Check It for Interactions

We hold 294 real supplement products containing Fulvic Acid, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Fulvic Acid. Even though Fulvic Acid itself has no known interaction with Megestrol Acetate, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Fulvic Acid and Megestrol Acetate 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 Fulvic Acid
Top half

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

29 days ago today
Medication Megestrol Acetate
Top half

#838 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.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Fulvic Acid reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Fulvic Acid and Megestrol Acetate records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Fulvic Acid

What is Fulvic Acid?

  • General wellness and energy
  • Gut health
  • Antioxidant support
  • Mineral and nutrient supplementation
  • Immune support

Fulvic acid is a natural compound formed when plants and microbes break down in soil, and it is sold as a supplement for energy, gut, and overall wellness. Human research is very limited, so most claims are unproven. Talk with your pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding due to a lack of safety data.

Derived from humus, soil, peat, and decomposed plant matter (often sourced from shilajit or leonardite) · Liquid drops, capsules, powders, shilajit resin, mineral supplements

An interaction check asks whether these two react with each other — it does not ask whether Fulvic Acid is a good idea for someone in your situation. Here is what our Fulvic Acid record says about it on its own.

Fulvic Acid: dosing

There is no official or standardized dose for fulvic acid. Products vary widely in concentration and form, including drops, capsules, and powders.The safest approach is to follow the directions on the product label and start with the lowest suggested amount.

From our Fulvic Acid monograph — the full record covers uses, side effects and every documented interaction.

Read the full Fulvic Acid monograph & all interactions
Medication

About Megestrol

What Is Megestrol Used For?

Brand names: Megestrol, Megace

Megestrol acetate is used for two distinct purposes depending on the formulation. Megestrol Acetate oral suspension is indicated for treating anorexia (loss of appetite), cachexia (severe weight loss and muscle wasting), or unexplained significant weight loss in patients with a diagnosis of AIDS.

Megestrol Acetate tablets are used for the palliative treatment — meaning to ease symptoms, not cure — of advanced breast cancer or endometrial (uterine lining) cancer that is recurrent, inoperable, or has spread to other parts of the body. Tablets are not a replacement for surgery, radiation, or chemotherapy.

Most-Reported Side Effects for Megestrol Acetate

From FAERS, the FDA’s public side-effect reporting system (0 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 353 reports
Diarrhea 352 reports
Decreased appetite 276 reports
Asthenia 273 reports
Nausea 268 reports
See full Megestrol drug information
Keep checking

Other Drugs & Fulvic Acid

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

0Major
257Moderate
0Minor
2,572No known interaction
257 Moderate 2,572 No interaction
Moderate

257 interactions

Showing 60 of 257 moderate interactions — see all 257 on the Fulvic Acid page.

No interaction 2,572 drugs checked — show the list

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

Showing the 60 most looked-up of 2,572 medications checked with no known interaction — see the full Fulvic Acid list.

See the full Fulvic Acid interactions page
See every supplement checked against Megestrol Acetate, ranked by severity
Evidence & sources

Fulvic Acid References

The 3 references that drive our Fulvic Acid monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Lu, FJ. Arsenic as a promoter in the effect of humic substances on plasma prothrombin time in vitro. Thromb Res 6-15-1990;58(6):537-541. PubMed
  2. Vucskits, AV, Hullar, I, Bersenyi, A, Andrasofszky, E, Kulcsar, M, Szabo, J. Effect of fulvic and humic acids on performance, immune response and thyroid function in rats. J Anim Physiol Anim Nutr (Berl) 2010;94(6):721-728. PubMed
  3. Gandy JJ, Meeding JP, Snyman JR, et al. Phase 1 clinical study of the acute and subacute safety and proof-of-concept efficacy of carbohydrate-derived fulvic acid. Clin Pharmacol. 2012;4:7-11. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Fulvic Acid and Megestrol Acetate Together: Common Questions

Is it safe to take Fulvic Acid with Megestrol Acetate?
We do not list a known interaction between Fulvic Acid and Megestrol Acetate. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Fulvic Acid and Megestrol Acetate have any of the same side effects?
Yes — our sources link each of them separately to 3 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Are Fulvic Acid and Megestrol Acetate used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Fulvic Acid in each. That is a conversation for your prescriber, especially if Megestrol Acetate is being adjusted to a target.
How was the Fulvic Acid and Megestrol Acetate combination checked?
Interactions in our licensed database are recorded against drug classes. Megestrol Acetate is filed under 2 classifications, and Fulvic Acid has documented interactions with 3 drug classes — none of Megestrol Acetate's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Fulvic Acid interact with any other medications?
Yes. Fulvic Acid has 257 documented drug interactions in our database — Megestrol Acetate is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Megestrol Acetate interact with any supplements?
Yes. Megestrol Acetate has documented interactions with 18 supplements in our database — Fulvic Acid is not one of them. The Megestrol Acetate interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Fulvic Acid monograph Uses, safety profile, and every drug interaction in one place Megestrol drug information The full plain-English guide to this medication Megestrol Acetate supplement interactions Every supplement checked against Megestrol Acetate, 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 References The 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Megestrol Acetate and Fulvic Acid?

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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.