Alpha Lipoic Acid and medications.
Alpha Lipoic Acid is in the Distil supplement database, evidence Grade A. The page below lists every medication we have explicitly assessed it against.
Alpha lipoic acid is an antioxidant that works in both fat- and water-based parts of the body and helps recycle vitamins C and E. Its strongest evidence is Grade A for diabetic neuropathy, with Ziegler's work as the anchor, and Grade B for broader antioxidant and metabolic effects including insulin sensitivity. The active form is R-ALA; standard racemic ALA is half inactive S-ALA, so effectively half the dose, and the usual target is 300 to 600mg of R-ALA. On interactions, it needs a 4-hour separation from thyroid medication. It also lowers blood glucose, so stacking it with metformin and berberine creates a triple glucose-lowering effect that warrants watching for hypoglycaemia. It pairs well with vitamins C and E in the antioxidant network. Take it with food to limit stomach upset, and consider a B-complex alongside, since very high doses can deplete thiamine.
Below are the 9 documented pairs we have explicitly assessed for Alpha Lipoic Acid: 9 caution. The pairs cluster around 2 mechanisms: Additive glucose lowering and Reduced thyroid-hormone effect. Every call is cited to either a clinical reference (PMID) or the British National Formulary. Anything not listed here is either still to be assessed or beyond our database scope. The checker beneath surfaces assessments by medication, and the missing-item form at the bottom of the page routes any uncatalogued medication into our next curation pass.
Documented interactions
Last reviewed 17 June 2026. Each interaction below lists the evidence its assessment drew on: some rest on studies of the exact pair, others on mechanism evidence, where a citation may support one part of the reasoning rather than the exact combination. The evidence line on each entry says which.
Additive glucose lowering
Caution Does Alpha Lipoic Acid interact with Empagliflozin?
Alpha lipoic acid may lower blood sugar by improving how your body responds to insulin. Empagliflozin also lowers blood sugar, so the two may add up. The combination is usually manageable because empagliflozin rarely causes low blood sugar on its own, but monitor your glucose when you start alpha lipoic acid or change the dose.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Caution Does Alpha Lipoic Acid interact with Gliclazide?
Alpha lipoic acid can lower blood sugar by improving how your body responds to insulin. Gliclazide already lowers blood sugar, so taking the two together may add up and could push your glucose too low. If you take both, monitor your blood glucose, especially in the first few weeks, and your doctor may need to reduce the gliclazide dose.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Caution Does Alpha Lipoic Acid interact with Glimepiride?
Alpha lipoic acid can lower blood sugar by improving how your body responds to insulin. Glimepiride already lowers blood sugar, so the two may add up and could push your glucose too low. If you take both, monitor your blood glucose, especially in the first few weeks, and your doctor may need to reduce the glimepiride dose.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Caution Does Alpha Lipoic Acid interact with Insulin aspart?
Alpha lipoic acid may improve how your body responds to insulin, which can lower blood sugar on top of the insulin you inject. This may increase the chance of glucose going too low. If you take alpha lipoic acid with insulin, monitor your blood glucose closely, especially early on, and your doctor may need to reduce your insulin dose.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Caution Does Alpha Lipoic Acid interact with Insulin glargine?
Alpha lipoic acid may improve how your body responds to insulin, which can lower blood sugar on top of the insulin you inject. This may increase the chance of glucose going too low. If you take alpha lipoic acid with insulin, monitor your blood glucose closely, especially early on, and your doctor may need to reduce your insulin dose.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Caution Does Alpha Lipoic Acid interact with Metformin?
Alpha lipoic acid may improve how your body responds to insulin and lower blood sugar. Metformin also lowers blood sugar, so the two may add up. The combination is generally manageable because metformin on its own rarely causes low blood sugar, but monitor your glucose when you start alpha lipoic acid or change the dose, and your doctor may adjust the metformin if needed.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Caution Does Alpha Lipoic Acid interact with Pioglitazone hydrochloride?
Alpha lipoic acid may lower blood sugar by improving how your body responds to insulin. Pioglitazone works the same way, by improving insulin sensitivity, so the two may add up. The combination is usually manageable, but monitor your glucose when you start alpha lipoic acid or change the dose.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Caution Does Alpha Lipoic Acid interact with Sitagliptin?
Alpha lipoic acid may lower blood sugar by improving how your body responds to insulin. Sitagliptin also lowers blood sugar, so the two may add up. The combination is usually manageable because sitagliptin rarely causes low blood sugar on its own, but monitor your glucose when you start alpha lipoic acid or change the dose.
Evidence: Supported by human study data.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Reduced thyroid-hormone effect
Caution Does Alpha Lipoic Acid interact with Levothyroxine?
Alpha lipoic acid may slow the body's conversion of thyroid hormone into its active form, so in theory it could blunt some of the benefit you get from levothyroxine and let a few underactive-thyroid symptoms creep back. This is based on animal studies rather than people, and the evidence is not all one way, so it is not a reason to avoid the combination. If you take levothyroxine, tell the clinician who manages your thyroid before starting alpha lipoic acid and ask for a thyroid blood test (TSH) a few weeks later so your dose can be reviewed if needed.
Evidence: No direct study of this exact combination yet; the caution rests on a plausible mechanism or on reports involving a related medicine.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope. Use the checker below to surface any medication, and submit a missing item if you take something we have not catalogued.
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How the checker decides
Every result has a source
Each pair we have assessed is cited to a published study (PMID) or the British National Formulary, so you can read the source yourself.
Four kinds of answer
Severe, caution, no known interaction, and not yet assessed. A pair we have not assessed is never shown as clear.
- Severe
- Caution
- No known interaction
- Not yet assessed
Nothing in our data is not a clearance
When nothing in our data records a problem with a pair, the result says no known interaction at typical doses, which is not a clearance: your pharmacist or GP can check the pair against your full medical history.
A full supplement review, built around you, not a generic stack.
The free checker answers one interaction question at a time. A Distil report reviews the bigger picture: your goals, diet, medications, current supplements and any blood results you provide, then shows what appears worth keeping, changing, adding or leaving out.
- what your diet already covers, so you are not adding a capsule for something food is already handling
- which evidence-graded compounds are worth considering for your goals, and which were considered but left out
- what to keep, change or stop from what you already take, plus the order to introduce anything new
- how your medications and complete supplement stack fit together, with daily timing and a clear point for reassessment
The interaction check is one section of the full report. You also get the reasoning behind each recommendation and the evidence references used.
£49 until 30 June 2027 · £79 from 1 July 2027.
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