A complete safety, timing, and dosage guide for combining Molybdenum with St. John's Wort — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take molybdenum and St. John's Wort together; there are no known interactions between them.
Molybdenum and St. John's Wort together are considered safe for most healthy adults. Molybdenum is a trace mineral that supports enzyme function, while St. John's Wort is a botanical extract commonly used for mood support. Because they act on entirely separate metabolic pathways, combining them does not raise any significant safety concerns.
Molybdenum is absorbed in the gut as the water-soluble molybdate ion, likely through anion transporters, and is then incorporated into enzymes such as sulfite oxidase and xanthine oxidase. St. John's Wort contains hypericin and hyperforin, which are lipophilic plant compounds that are metabolized by cytochrome P450 enzymes, particularly CYP3A4, and they can also induce those enzymes over time. Molybdenum, however, is not processed by the cytochrome P450 system, nor does it influence CYP3A4 activity, so it neither affects nor is affected by St. John's Wort's main metabolic trigger. They do not share a common receptor, transporter, or binding site in the digestive tract, and molybdenum does not chelate or bind to the polyphenolic constituents in St. John's Wort. In short, their absorption and elimination are independent, which explains why no interaction is observed in clinical practice.
If you need both molybdenum and St. John's Wort, the simplest approach is to take them together with your morning meal. No spacing is required, so you can swallow them at the same time with a glass of water. A typical molybdenum dose is 75 mcg per day, while St. John's Wort standardized to 0.3% hypericin is usually taken as 300 mg three times daily, but follow the label and your clinician's guidance. If you miss a dose, simply skip it and resume your normal schedule — never double up, because that increases the risk of side effects without providing additional benefit. Pairing both with breakfast helps build a consistent routine and minimizes any potential stomach sensitivity.
Molybdenum is most commonly sold as sodium molybdate, which is highly water-soluble and well absorbed; chelated or colloidal forms do not offer a meaningful benefit. St. John's Wort products vary in standardization — look for extracts standardized to contain at least 0.3% hypericin, since that ensures consistent dosing. The specific formulation of either supplement does not change the fact that they are safe to take together, because their biological pathways do not overlap.
Molybdenum is frequently included in trace mineral formulas alongside zinc, selenium, copper, and chromium, while St. John's Wort is typically sold as a standalone herbal extract or blended with other botanical mood-support herbs like valerian and lemon balm. The two are rarely deliberately combined in a single commercial product, so you will likely be taking them as separate supplements.
Yes, you can take molybdenum and St. John's Wort at the same time. There is no known interaction that would make taking them together unsafe or reduce their effectiveness. I usually recommend taking them with a small meal to keep your stomach comfortable.
Yes, it is safe for most healthy adults to combine these two supplements daily. Molybdenum is an essential trace mineral your body needs in very small amounts, and St. John's Wort can be used daily for mood support under medical supervision. Just be careful not to take more than 2 mg of molybdenum a day from all supplements, and monitor how you feel with St. John's Wort.
You do not need to wait any amount of time between molybdenum and St. John's Wort. Because they do not affect each other's absorption or metabolism, you can take them at the same time or within a few minutes of each other.
No, they do not compete for absorption. Molybdenum is absorbed as a water-soluble molybdate ion through specific anion transporters, while St. John's Wort's active compounds are absorbed passively through the intestinal wall. There is no shared transporter or receptor, so your body handles them independently.
Most healthy adults can safely take this combination, but anyone on prescription medications — especially antidepressants, oral contraceptives, blood thinners, or immunosuppressants — should avoid St. John's Wort because it can make those drugs less effective. Pregnant or breastfeeding women, and people with chronic kidney disease or gout, should also consult their doctor before combining these supplements.
Take both with food to prevent mild stomach irritation and to build a steady daily habit. Molybdenum is water-soluble and absorbs well regardless, while St. John's Wort is better tolerated when taken alongside a meal. A balanced breakfast with some protein and healthy fat is a great time to take both.
Reviewed by Caroline M. on April 26, 2026 for accuracy against the sources listed above. This page is educational and is not a substitute for professional medical advice.
The matrix has 86 supplements and 7310 pairwise interactions. Click any cell to see the full breakdown.