NutriStack
L-Carnitine and Metoprolol, a synergy.
L-Carnitine modestly lowers diastolic blood pressure and supports cardiac fatty-acid oxidation. Adjunctive use with metoprolol in heart failure or post-MI patients is generally beneficial, though the BP effect can rarely be additive.
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
- L-Carnitine and Metoprolol
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Moderate evidence
Synergy
What is happening. L-Carnitine modestly lowers diastolic blood pressure and supports cardiac fatty-acid oxidation. Adjunctive use with metoprolol in heart failure or post-MI patients is generally beneficial, though the BP effect can rarely be additive.
Mechanism. L-Carnitine transports long-chain fatty acids into mitochondria for beta-oxidation, supporting ATP synthesis in cardiomyocytes. Beta-blockade alters cardiac substrate use; carnitine helps maintain energy supply.
Recommendation. L-Carnitine 1-2 g/day is compatible with metoprolol and may add cardiovascular benefit. Discuss with your cardiologist before starting, particularly if you have heart failure.
Sources (2)
- Askarpour M, Hadi A, Dehghani Kari Bozorg A, et al. Effects of L-carnitine supplementation on blood pressure: a systematic review and meta-analysis of randomized controlled trials. J Hum Hypertens. 2019;33(10):725-734. PMID 31481697
- Sharma V, McNeill JH. Parallel effects of β-adrenoceptor blockade on cardiac function and fatty acid oxidation in the diabetic heart. World J Cardiol. 2011;3(10):315-22. PMID 21949571
Stack Score
How this pair moves the number.
Effect on the composite score
If both L-Carnitine and Metoprolol are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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