Supplement·Interactions·Reviewed June 9, 2026
Vitamin D2 interactions.
Vitamin D2 has 11 documented interactions in the NutriStack database: 3 that need timing or caution and 8 that work synergistically. The full list, with what each pairing does, is below.
Vitamin D2 at a glance.
A quick, data-grounded summary. The full table is below.
Vitamin D2 has 11 documented interactions in the NutriStack database: 3 that need timing or caution and 8 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with vitamin d2.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Chlorthalidone | Caution | Chlorthalidone reduces urinary calcium excretion, and Vitamin D2 can increase calcium absorption after metabolic activation. High-dose Vitamin D2... |
| Hydrochlorothiazide | Caution | Hydrochlorothiazide reduces urinary calcium excretion, and Vitamin D2 can increase calcium absorption after conversion to active vitamin D... |
| Calcium | Timing Sensitive | Vitamin D2 increases how much dietary and supplemental calcium the gut absorbs, which is beneficial for bone health at sensible doses but can become... details → |
| Dexamethasone | Synergy | Dexamethasone is a potent systemic glucocorticoid, and prolonged use can accelerate bone loss. Vitamin D2 can help maintain vitamin D status and... details → |
| Evening Primrose Oil | Synergy | Evening Primrose Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin D2. |
| Flaxseed Oil | Synergy | Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin D2. |
| Magnesium Glycinate | Synergy | Magnesium is required for the body to convert Vitamin D2 into its biologically active form. With low magnesium status, supplemental D2 is... |
| MCT Oil | Synergy | MCT Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin D2. |
| Methylprednisolone | Synergy | Chronic methylprednisolone exposure can reduce bone density and raise fracture risk. Vitamin D2 can help maintain vitamin D status and calcium... details → |
| Prednisolone | Synergy | Prednisolone increases fracture risk when used chronically by accelerating bone loss. Vitamin D2 can help maintain vitamin D status, which supports... details → |
| Prednisone | Synergy | Long-term prednisone therapy can cause rapid bone loss and increase fracture risk. Vitamin D2 can help maintain vitamin D status and calcium... details → |
The full vitamin d2 profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common vitamin d2 questions.
Quick answers drawn from the table above.
What interacts with Vitamin D2?
In the NutriStack database, Vitamin D2 has 11 documented interactions with other supplements and medications. The most notable include Chlorthalidone, Hydrochlorothiazide, Calcium, Dexamethasone, and Evening Primrose Oil.
What works well with Vitamin D2?
Vitamin D2 pairs synergistically with Dexamethasone, Evening Primrose Oil, Flaxseed Oil, Magnesium Glycinate, and MCT Oil in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take Vitamin D2 with Chlorthalidone?
NutriStack classifies the Vitamin D2 and Chlorthalidone pairing as caution: Chlorthalidone reduces urinary calcium excretion, and Vitamin D2 can increase calcium absorption after metabolic activation. High-dose Vitamin D2 can therefore add to... Avoid high-dose Vitamin D2 with chlorthalidone unless your clinician is tracking calcium. If Vitamin D2 is prescribed, ask when to recheck serum...
Check your whole stack
See how vitamin d2 fits your routine.
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