What kind of interaction is it?

Timing-sensitive: the two substances can be taken on the same day but should be separated by a minimum time window.

Is this interaction backed by published research?

Yes. NutriStack lists 1 citation row for the Fucoxanthin + Vitamin D3 pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Supplement × Supplement·timing-sensitive·Moderate evidence

Fucoxanthin + Vitamin D3

Q: Can I take Fucoxanthin and Vitamin D3 together?

Yes, if you separate them in time. Fucoxanthin and Vitamin D3 have a documented timing-sensitive interaction. Vitamin D3 is fat-soluble and, like fucoxanthin, depends on dietary fat for absorption. Taking them together with a fat-containing meal supports uptake of both. There is no known adverse pharmacologic interaction.

Q: How does this affect a NutriStack Stack Score?

-5 to your Stack Score per scored timing-sensitive row.

Timing Sensitive Moderate evidence

Vitamin D3 is fat-soluble and, like fucoxanthin, depends on dietary fat for absorption. Taking them together with a fat-containing meal supports uptake of both. There is no known adverse pharmacologic interaction.

Supplement × Supplement

Open the interaction checker → Read the methodology

From the database

What the row says.

Every entry follows the same shape: what is happening, the mechanism, and the recommendation.

Substances

Fucoxanthin and Vitamin D3

Pair type

Timing Sensitive

Evidence

Moderate

Source citations

Scope

Supplement × Supplement

Last verified

June 4, 2026

Timing SensitiveModerate evidence

What is happening. Vitamin D3 is fat-soluble and, like fucoxanthin, depends on dietary fat for absorption. Taking them together with a fat-containing meal supports uptake of both. There is no known adverse pharmacologic interaction.

Mechanism. Shared dependence on dietary lipid and micellar incorporation for intestinal absorption of fat-soluble compounds.

Recommendation. Take both with the same fat-containing meal to optimize absorption. No therapeutic conflict expected.

Stack Score

How it moves the number.

Effect on the composite score

If both Fucoxanthin and Vitamin D3 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 at /methodology/stack-score.

Sources

Sources, by evidence tier.

Every claim on this page is cited. PMIDs link straight to PubMed.

Reference material

1Dawson-Hughes B, et al. Dietary fat increases vitamin D-3 absorption. J Acad Nutr Diet. 2015.Needs sourceNo link

Check your full routine

One pair was the worked example.

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Open the interaction checker → Browse the research index