NutriStack
Molybdenum and MSM, timing-sensitive.
This is a mechanistically grounded but largely theoretical absorption-competition concern. The molybdate versus sulfate competition for a shared intestinal transporter is well established in animal and cell studies, and MSM contributes to the sulfate pool. However, MSM is taken up by the small intestine in a high-capacity manner and is converted to sulfate mostly after absorption, so its direct dampening of molybdenum uptake in the gut is expected to be small, and no human study has measured an MSM effect on molybdenum status specifically. Note that added sulfate, if anything, lowers molybdenum exposure, so this is not a safety concern.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Molybdenum and MSM
- Pair type
- Timing Sensitive
- Evidence (highest tier)
- Emerging
- Source citations
- 3 sources
- Stack Score effect
- −5 to your Stack Score (per scored timing-sensitive row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Timing Sensitive · Emerging evidence
Timing Sensitive
What is happening. This is a mechanistically grounded but largely theoretical absorption-competition concern. The molybdate versus sulfate competition for a shared intestinal transporter is well established in animal and cell studies, and MSM contributes to the sulfate pool. However, MSM is taken up by the small intestine in a high-capacity manner and is converted to sulfate mostly after absorption, so its direct dampening of molybdenum uptake in the gut is expected to be small, and no human study has measured an MSM effect on molybdenum status specifically. Note that added sulfate, if anything, lowers molybdenum exposure, so this is not a safety concern.
Mechanism. Molybdenum is absorbed as molybdate, which shares an intestinal anion transport system with sulfate; sulfate competitively inhibits molybdate uptake and is the classic antagonist against molybdenum overload. MSM (methylsulfonylmethane) is an organic sulfur donor that is absorbed and metabolized to sulfate in the body, expanding the systemic and (to a lesser extent) luminal sulfate pool. In principle, a larger sulfate load can compete with molybdate for absorption and increase its excretion, lowering molybdenum uptake.
Recommendation. For most people no action is needed. If you take both and want to be conservative, especially if molybdenum is being used deliberately to correct a documented deficiency, separate them by about 2 to 3 hours by taking molybdenum on its own (for example with a different meal) rather than together with a large MSM dose (commonly 1.5 to 3 g or more). Keep molybdenum within the normal 45 to 150 mcg/day range. No separation is needed simply for safety.
Minimum separation. 2 to 3 hours if separating (optional)
Sources (3)
- Dick AT, Bingley JB, and related work on competition of molybdate and sulphate ions for a transport system in the ovine small intestine.
- Suttle NF. Molybdenum toxicity: interactions between copper, molybdenum and sulphate. 1991.
- Reviews on methylsulfonylmethane absorption and conversion to sulfate in vivo.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Molybdenum and MSM are in the same stack, this pair applies −5 to your Stack Score (per scored timing-sensitive row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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