Supplements and antibiotics
7 documented interactions6 supplements
Read this first. This page is educational reference material, not medical advice, and it is not a substitute for a pharmacist’s review of your own medication list. It cannot know your kidney function, your doses, your other prescriptions, or why you were put on them. Bring the actual bottle to the pharmacist who fills your prescriptions, or to your prescriber, before you start or stop anything. In an emergency call 911 (US) or your local emergency number.
Almost every antibiotic interaction here is a timing problem rather than a danger: minerals bind quinolone and tetracycline antibiotics in the gut and less of the antibiotic reaches the bloodstream. The fix is separation, not abstinence — and it matters, because an under-absorbed antibiotic is an under-treated infection.
Below is every interaction Magellan documents for this class — 7 entries across 6 supplements, each with the mechanism as the cited reference states it, how serious that reference treats it, and where to take the question next.
One caveat on how to weigh them. 1 of the 7 entries below are marked class-level caution: the source flags a broad group of drugs that share a metabolic pathway — usually CYP3A4 — rather than reporting a finding about a named medicine. Those are weaker than the entries that name a specific drug, and they are labelled so you can tell the difference rather than being quietly padded in.
Check your own listMagellan’s Medication Safety Check runs entirely on your device — type the medicines you take and it flags every documented interaction in this dataset. Nothing you type is sent anywhere.
Open the Medication Safety Check → Every documented interaction in this class
Moderate Tetracycline and quinolone antibiotics (e.g. doxycycline, ciprofloxacin, levofloxacin)
Documented for Magnesium
Direction of the risk: Absorption and timing — taken together, less of one of the two is absorbed. The entry below says which, and separating the doses is usually the fix.Magnesium forms insoluble complexes with these antibiotics in the gut, reducing their absorption and effectiveness; take the antibiotic at least 2 hours before or 4-6 hours after magnesium.
Timing the source specifies: Take the antibiotic at least 2 hours before or 4-6 hours after magnesium.
Source: Magnesium: Fact Sheet for Health Professionals ↗
What to do: Separate the doses — where the source specifies an interval it is stated in the entry above. Never skip or shorten an antibiotic course to take a supplement; if you are unsure about timing, the pharmacist who dispensed the antibiotic can answer it in a minute.
Minor Cephalosporin antibiotics (e.g., cefoperazone)
Documented for Vitamin K2 (MK-7)
These antibiotics can reduce vitamin K-producing gut bacteria and may inhibit vitamin K action in the body; supplementation is generally unnecessary unless antibiotic use is prolonged with poor dietary vitamin K intake.
Source: Vitamin K - Health Professional Fact Sheet, Office of Dietary Supplements ↗
What to do: Separate the doses — where the source specifies an interval it is stated in the entry above. Never skip or shorten an antibiotic course to take a supplement; if you are unsure about timing, the pharmacist who dispensed the antibiotic can answer it in a minute.
Moderate Quinolone antibiotics (e.g., ciprofloxacin) and tetracycline antibiotics
Documented for Zinc
Direction of the risk: Absorption and timing — taken together, less of one of the two is absorbed. The entry below says which, and separating the doses is usually the fix.Zinc can bind these antibiotics in the gastrointestinal tract, reducing absorption of both the zinc and the antibiotic, which can lower the antibiotic's ability to fight infection; NIH advises taking the antibiotic at least 2 hours before or 4-6 hours after zinc.
Timing the source specifies: NIH advises taking the antibiotic at least 2 hours before or 4-6 hours after zinc.
Source: Zinc - Health Professional Fact Sheet, Office of Dietary Supplements ↗
What to do: Separate the doses — where the source specifies an interval it is stated in the entry above. Never skip or shorten an antibiotic course to take a supplement; if you are unsure about timing, the pharmacist who dispensed the antibiotic can answer it in a minute.
Minor Pivalate-conjugated antibiotics (e.g., pivampicillin)
Documented for Carnitine (L-carnitine and acetyl-L-carnitine) — specifically L-Carnitine
Direction of the risk: Nutrient level — this entry is at least partly about what happens to your own level of a vitamin or mineral, not only to the drug.Chronic use of these antibiotics can deplete tissue carnitine levels, though no clear cases of resulting illness have been documented.
Source: Carnitine - Health Professional Fact Sheet ↗
What to do: Separate the doses — where the source specifies an interval it is stated in the entry above. Never skip or shorten an antibiotic course to take a supplement; if you are unsure about timing, the pharmacist who dispensed the antibiotic can answer it in a minute.
Minor Antibiotics
Documented for Probiotics
Probiotics are generally considered safe to take alongside antibiotics for most people, but extra caution is warranted in those who are very weak or have poorly functioning immune systems.
Source: Probiotics: Usefulness and Safety | NCCIH ↗
What to do: Separate the doses — where the source specifies an interval it is stated in the entry above. Never skip or shorten an antibiotic course to take a supplement; if you are unsure about timing, the pharmacist who dispensed the antibiotic can answer it in a minute.
Moderate Bisphosphonates and tetracycline/quinolone antibiotics (via magnesium malate component) class-level caution
Documented for NOVOS Core (multi-ingredient formula)
Direction of the risk: Absorption and timing — taken together, less of one of the two is absorbed. The entry below says which, and separating the doses is usually the fix.Magnesium reduces absorption of oral bisphosphonates (e.g., alendronate) and forms insoluble complexes with tetracycline and quinolone antibiotics, reducing their effectiveness; dosing should be separated by 2+ hours.
Timing the source specifies: Dosing should be separated by 2+ hours.
Source: Magnesium - Health Professional Fact Sheet ↗
What to do: Bisphosphonates already have strict dosing rules — on waking, with plain water, upright, nothing else by mouth for 30–60 minutes. Keep the supplement well outside that window and confirm the interval with your pharmacist.
Moderate Levothyroxine and quinolone antibiotics (via calcium alpha-ketoglutarate component)
Documented for NOVOS Core (multi-ingredient formula)
Direction of the risk: Absorption and timing — taken together, less of one of the two is absorbed. The entry below says which, and separating the doses is usually the fix.Calcium reduces absorption of levothyroxine and quinolone antibiotics (e.g., ciprofloxacin); dosing should be separated by several hours.
Timing the source specifies: Dosing should be separated by several hours.
Source: Calcium - Health Professional Fact Sheet ↗
What to do: Take levothyroxine on an empty stomach and separate any mineral-containing supplement by several hours. Ask about a TSH recheck roughly six weeks after any change — that is the interval a thyroid dose is normally judged on.
Which drugs are in this class
Medicines in this group include: Ciprofloxacin (Cipro), Levofloxacin (Levaquin), Moxifloxacin (Avelox), Doxycycline (Vibramycin), Minocycline (Minocin), Tetracycline (Sumycin), Cephalexin (Keflex), Cefdinir (Omnicef), Ceftriaxone (Rocephin), Amoxicillin (Amoxil), Azithromycin (Zithromax, Z-pack).
Brand names are listed in brackets after the generic ingredient. If the name on your bottle is not here, the generic name on the label almost always is — and the Medication Safety Check accepts either.
How to read a severity label
- Major — the source describes a clinically significant risk — treat this as a combination to clear with a clinician before you start, not after.
- Moderate — a real, documented interaction that usually calls for monitoring, separating the doses, or a prescriber-led dose change.
- Minor — documented but usually low-impact, or based on mechanism and animal data rather than human events — still worth naming to your pharmacist.
Severity describes the interaction as the cited reference frames it, not how a specific person will react. A “minor” entry in someone with kidney disease, on five other drugs, can matter more than a “major” one in someone on nothing else.
What this page does not tell you
This is a curated set of interactions with citations — not an exhaustive pharmacology database. An interaction that is absent here has not been ruled out; it may simply not be documented in the references Magellan curates from. Supplements are also not batch-tested for identity or contamination the way prescription drugs are, so what is on the label is a claim rather than a guarantee. And most of these entries come from case reports and mechanistic work rather than randomized trials, which is exactly why the sensible response is a pharmacist review rather than either alarm or dismissal.
Supplements documented in this class
Zinc3 documented interactions in total.
Questions people actually ask
Which supplements interact with antibiotics?
Magnesium, Vitamin K2 (MK-7), Zinc, Carnitine (L-carnitine and acetyl-L-carnitine), Probiotics, NOVOS Core (multi-ingredient formula) — 7 documented entries in total (0 major, 4 moderate, 3 minor). Each entry on this page names the reference it came from.
Which drugs count as antibiotics?
In this dataset the class includes Ciprofloxacin, Levofloxacin, Moxifloxacin, Doxycycline, Minocycline, Tetracycline and others. Brand names are mapped to their generic ingredient inside the Medication Safety Check, so typing the name on your bottle works.
Does an interaction mean I have to stop the supplement?
Usually not. Most entries here call for one of three things: separating the doses by a few hours, monitoring a lab value or a home reading for a couple of weeks, or a prescriber-led dose adjustment. The decision belongs to the clinician who manages the prescription — what this page is for is making sure the conversation happens before you start rather than after something goes wrong.
Who compiles this. Magellan Longevity is written and edited by Gabriel Radu, DO — a physiatrist (New York license 275110, NPI 1376861765). Interaction entries are curated from clinical references — the NIH Office of Dietary Supplements, NCCIH, MedlinePlus, Mayo Clinic and Memorial Sloan Kettering’s About Herbs among them — and every entry links to the reference it came from so you can check it yourself. Magellan earns affiliate commission on some products; nothing on a safety page is softened, delayed, or omitted because of it. Where a supplement we sell carries a major documented interaction, that is the first thing on the page.