Supplement·Interactions·Reviewed June 9, 2026
Selenium interactions.
Selenium has 16 documented interactions in the NutriStack database: 2 that need timing or caution and 14 that work synergistically. The full list, with what each pairing does, is below.
Selenium at a glance.
A quick, data-grounded summary. The full table is below.
Selenium has 16 documented interactions in the NutriStack database: 2 that need timing or caution and 14 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with selenium.
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 |
|---|---|---|
| Vitamin C | Timing Sensitive | High-dose vitamin C may reduce selenite to elemental selenium, which is not absorbable. Does not affect selenomethionine forms. details → |
| Vitamin C Liposomal | Timing Sensitive | High-dose vitamin C may reduce selenite to elemental selenium, which is not absorbable. Does not affect selenomethionine forms. details → |
| Coenzyme Q10 | Synergy | Adequate selenium status helps keep coenzyme Q10 in its active reduced form, and the pair together supports cardiac function more than either alone... details → |
| Coenzyme Q10 Ubiquinol | Synergy | Selenium-dependent enzymes help regenerate ubiquinol after it is oxidized during antioxidant activity, so the two nutrients complement each other in... details → |
| Combined Oral Contraceptive | Synergy | Combined oral contraceptive use is associated with lower serum selenium and reduced glutathione peroxidase activity in several studies, contributing... details → |
| Elderberry Zinc Lozenges | Synergy | Both support immune function and antioxidant defense. Elderberry Zinc Lozenges supports SOD and thymulin; selenium supports GPx and selenoproteins. |
| Iodine | Synergy | Selenium is critical for thyroid hormone metabolism. Selenoproteins (deiodinases) convert T4 to active T3, and glutathione peroxidase protects the... details → |
| L-Glutathione | Synergy | Selenium is an essential cofactor for glutathione peroxidase, the enzyme through which glutathione neutralizes peroxides, so adequate selenium is... |
| Lycopene | Synergy | Lycopene and selenium have complementary antioxidant actions and have been studied together for prostate health and as antioxidant combinations. |
| Methimazole | Synergy | Selenium has been studied as an add-on to methimazole in Graves' disease. Some smaller trials suggest improved antibody or early biochemical... details → |
| NAC | Synergy | NAC provides glutathione, and selenium is the catalytic center of glutathione peroxidase enzymes. |
| Sulforaphane | Synergy | Sulforaphane and selenium act on the same antioxidant axis: sulforaphane induces the genes for selenium-dependent enzymes (thioredoxin reductase 1... |
| Vitamin E | Synergy | Selenium and vitamin E work synergistically as antioxidants. Selenium is part of glutathione peroxidase, while E breaks lipid peroxidation chains. details → |
| Zinc | Synergy | Both support immune function and antioxidant defense. Zinc supports SOD and thymulin; selenium supports GPx and selenoproteins. |
| Zinc Carnosine | Synergy | Both support immune function and antioxidant defense. Zinc Carnosine supports SOD and thymulin; selenium supports GPx and selenoproteins. |
| Zinc Picolinate | Synergy | Both support immune function and antioxidant defense. Zinc Picolinate supports SOD and thymulin; selenium supports GPx and selenoproteins. |
The full selenium profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common selenium questions.
Quick answers drawn from the table above.
What interacts with Selenium?
In the NutriStack database, Selenium has 16 documented interactions with other supplements and medications. The most notable include Vitamin C, Vitamin C Liposomal, Coenzyme Q10, Coenzyme Q10 Ubiquinol, and Combined Oral Contraceptive.
What works well with Selenium?
Selenium pairs synergistically with Coenzyme Q10, Coenzyme Q10 Ubiquinol, Combined Oral Contraceptive, Elderberry Zinc Lozenges, and Iodine in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take Selenium with Vitamin C?
NutriStack classifies the Selenium and Vitamin C pairing as timing sensitive: High-dose vitamin C may reduce selenite to elemental selenium, which is not absorbable. Does not affect selenomethionine forms. If using sodium selenite form, separate from high-dose vitamin C by 2 hours. Selenomethionine is unaffected.
Check your whole stack
See how selenium fits your routine.
NutriStack screens your full stack for interactions and timing conflicts, and updates the moment you change it.