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 2 citation rows for the Levothyroxine + Zinc Carnosine pair, each linking to PubMed by PMID where available. Full sourcing methodology at https://nutristackapp.com/methodology/interactions.

Interaction databaseSupplement × PrescriptionReviewed May 2026

Levothyroxine and Zinc Carnosine, timing-sensitive.

Q: Can I take Levothyroxine and Zinc Carnosine together?

Yes, if you separate them in time. Levothyroxine and Zinc Carnosine have a documented timing-sensitive interaction. Zinc carnosine supplies zinc, a divalent mineral that may interfere with levothyroxine absorption if taken at the same time. Direct levothyroxine-zinc outcome data are limited, so this is a precaution based on thyroid hormone sensitivity to polyvalent cations. It matters most for people whose TSH target is tight.

Q: How does this affect a NutriStack Stack Score?

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

Zinc carnosine supplies zinc, a divalent mineral that may interfere with levothyroxine absorption if taken at the same time. Direct levothyroxine-zinc outcome data are limited, so this is a precaution based on thyroid hormone sensitivity to polyvalent cations. It matters most for people whose TSH target is tight.

2 primary source citations. Emerging evidence. Last verified May 30, 2026.

Open the interaction checker →Read the methodology

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.

Sourcing standards·Evidence tiers

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: Levothyroxine and Zinc Carnosine
Pair type: Timing Sensitive
Evidence (highest tier): Emerging
Source citations: 2 sources
Stack Score effect: −5 to your Stack Score (per scored timing-sensitive row).
Scope: Supplement × Prescription
Last verified: May 30, 2026

Timing Sensitive · Emerging evidence

Timing Sensitive

What is happening. Zinc carnosine supplies zinc, a divalent mineral that may interfere with levothyroxine absorption if taken at the same time. Direct levothyroxine-zinc outcome data are limited, so this is a precaution based on thyroid hormone sensitivity to polyvalent cations. It matters most for people whose TSH target is tight.

Mechanism. Zinc may bind levothyroxine or reduce its solubility in the gastrointestinal tract, leaving less hormone available for absorption. The carnosine carrier does not remove the zinc-cation concern.

Recommendation. Separate zinc carnosine from levothyroxine by at least 4 hours. If your TSH changes after adding it, correct the timing first and then discuss whether a levothyroxine dose adjustment is still needed.

Minimum separation. 240

Sources (2)

Stack Score

How this pair moves the number.

Effect on the composite score

If both Levothyroxine and Zinc Carnosine 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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