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L-Carnitine in Neuralisse: Not the Form the Nerve Studies Used
Neuralisse lists plain L-carnitine fourth in its blend, so a capsule holds at most about 58 mg. Nerve trials tested acetyl-L-carnitine, a related form, at 1,500-3,000 mg a day, and a Cochrane review still called the benefit uncertain. Large doses can blunt thyroid hormone, so thyroid patients should ask first.
Written by the Goneuralisse editorial teamUpdated
The basics
What is L-carnitine?
L-carnitine is a compound made from two amino acids. It carries fatty acids into the mitochondria, the parts of cells that burn fuel for energy (ODS, Carnitine). Your liver and kidneys make it, and red meat supplies more.
Most healthy adults make enough. Supplements are sold for energy, exercise and heart health. In Neuralisse, "L-Carnitine" is the fourth of six names in the 575 mg proprietary blend.
| Label name | L-Carnitine |
|---|---|
| What it is | Amino acid derivative, amino acid derivative |
| Position in the blend | 4 of 6 (labels list blend ingredients from most to least by weight) |
| Amount per capsule | Not disclosed. At most about 58 mg by label order (part of the 575 mg blend). |
| Amount used in research | Nerve trials used acetyl-L-carnitine, 1,500-3,000 mg a day |
| Strength of evidence | Uncertain (different form studied) |
| Main use studied | Helps cells use fat for energy |
| Main caution | Can blunt thyroid hormone; GI upset and fishy odor at about 3 g a day. |
Two forms
L-carnitine vs acetyl-L-carnitine: what is the difference?
Nerve studies used acetyl-L-carnitine, often shortened to ALC or ALCAR, not the plain L-carnitine in Neuralisse (LPI, L-carnitine). The acetyl form carries an extra chemical group, and researchers chose it for nerve work.
The two are related. Still, results from one form are not proof for the other. Treat any nerve claim about "carnitine" with care until you know which form was tested.
| Feature | L-carnitine (in Neuralisse) | Acetyl-L-carnitine (in nerve trials) |
|---|---|---|
| Name on label | "L-Carnitine" | Not in Neuralisse |
| Daily amount | At most about 58 mg, best case | 1,500-3,000 mg (Cochrane, ALC for diabetic neuropathy) |
| Share of trial dose | About 2% to 4% of the trial range, even before the form difference | |
| Nerve evidence | No trial found | Uncertain; low to very low certainty (Cochrane, ALC for diabetic neuropathy) |
| Common uses | Energy and exercise products | Nerve and memory research |
Per capsule
How much L-carnitine is in Neuralisse?
The best case is about 58 mg per capsule. The label prints no figure, so that number is a ceiling worked out from blend order (FDA, Labeling guide ch. IV).
About 400 to 567 mg of the 575 mg blend must be magnesium glycinate to deliver the printed 80 mg of magnesium. That leaves no more than about 175 mg for five ingredients. L-carnitine is third of those five, behind alpha lipoic acid and butcher's broom, so it can hold no more than a third of that space. The bar below shows how the blend splits up.
- 575 mg
The whole proprietary blend in one capsule. The label lists six ingredients, heaviest first (FDA, Labeling guide ch. IV).
- 400-567 mg
The 80 mg of magnesium on the label has to come from magnesium glycinate. Pure magnesium bisglycinate is about 14% magnesium (24.3 / 172.4), so it takes about 567 mg. Buffered forms near 20% magnesium take about 400 mg.
- 8-175 mg
What is left for the other five ingredients together. Because they are listed by weight, the second one can be at most half of that, the third a third, and so on.
The most each ingredient can weigh per capsule
- Alpha lipoic acid≤ 175 mg
- Butcher's broom≤ 87 mg
- L-carnitine≤ 58 mg
- Turmeric≤ 43 mg
- Coenzyme Q10≤ 35 mg
Best case: the lighter, 20%-magnesium form of glycinate. If the glycinate is pure bisglycinate, all five share about 8 mg. The label does not say which form is used.
The research
Does acetyl-L-carnitine help nerve pain?
The best evidence is unclear. A 2019 Cochrane review of four trials with about 907 people found it uncertain whether acetyl-L-carnitine eased diabetic nerve pain more than placebo, and rated the evidence low to very low certainty (Cochrane, ALC for diabetic neuropathy).
Trials in the review
About 907 people with diabetic nerve problems took 1,500 to 3,000 mg a day.
Certainty of evidence
Cochrane graded it low to very low. New studies could easily change the picture.
Conflicting results
In one trial, 3 g a day made nerve symptoms from taxane cancer drugs worse (LPI, L-carnitine).
Put together, even the right form at the right dose has not shown a clear benefit. Neuralisse uses neither the studied form nor a dose near the studied range. That gap belongs in any honest view of the formula.
Safety
Does L-carnitine affect thyroid medicine?
In large doses, yes. In a 2001 trial, 50 women taking high doses of levothyroxine got 2 or 4 g of L-carnitine a day for six months, and it reversed and prevented their overactive-thyroid symptoms (Benvenga 2001, carnitine & thyroid). The researchers concluded that carnitine blocks thyroid hormone action in the body's tissues.
Ask your doctor before starting Neuralisse. Its carnitine dose is far below the trial amount, and no study has tested an effect at 58 mg. Your doctor can decide whether to recheck your thyroid levels.
The same effect could matter for people with an underactive thyroid who rely on their medicine. Our medicines and Neuralisse page lists the other drug cautions in the blend.
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Order nowSide effects
What are the side effects of L-carnitine?
Most side effects show up near 3 g a day. The NIH lists nausea, vomiting, stomach cramps, diarrhea and a fishy body odor at that level (ODS, Carnitine).
What is TMAO?
Gut bacteria turn carnitine into a compound called TMAO, short for trimethylamine-N-oxide. Higher TMAO levels are linked with higher heart disease risk (ODS, Carnitine). A link is not proof of harm, and a small amount like this one adds little. People with heart disease may still want to raise it with their doctor.
See every ingredient's effects on our Neuralisse side effects page.
Medicines
Do seizure medicines lower carnitine?
Some do. Valproic acid and certain other anticonvulsants can lower carnitine levels in the body, according to the NIH (ODS, Carnitine).
That does not mean a seizure patient should add carnitine on their own. A neurologist decides whether levels need testing and what dose, if any, fits. Neuralisse is not designed for that purpose, and its carnitine amount is unknown.
- Tell your neurologist about every supplement you take.
- Do not stop or change a seizure medicine because of a supplement.
- Bring the Neuralisse bottle to your visit so the full label can be read.
Bottom line
Is the L-carnitine in Neuralisse worth paying for?
On its own, probably not for nerve support. The amount is small, the form differs from the trials, and even the trials left the answer uncertain.
That does not make Neuralisse unsafe or useless. It means the L-carnitine line on the label adds little that research can measure. Judge the product on its printed magnesium, on how you feel during the 60-day guarantee window, and on your doctor's advice. Numbness, burning or weakness that is new or getting worse calls for a checkup, and an urgent one if it came on suddenly.
FAQ
L-carnitine in Neuralisse: common questions
How much L-carnitine is in Neuralisse?
The label does not list it. L-carnitine is fourth in a 575 mg blend that must also deliver 80 mg of magnesium from magnesium glycinate, so the best case is about 58 mg per capsule. The true amount could be far lower.
Is L-carnitine the same as acetyl-L-carnitine?
No. They are related, but acetyl-L-carnitine has an added acetyl group. Nerve trials used acetyl-L-carnitine at 1,500 to 3,000 mg a day. Neuralisse contains plain L-carnitine, so those trial results do not apply to it directly.
Does L-carnitine help neuropathy?
There is no good evidence that plain L-carnitine helps nerve problems. A Cochrane review found it uncertain whether even acetyl-L-carnitine reduces diabetic nerve pain. Neuralisse is a supplement, not a treatment for neuropathy, and should not replace medical care.
Can L-carnitine interfere with levothyroxine?
At 2 to 4 g a day, L-carnitine blocked thyroid hormone effects in a clinical trial. The amount in Neuralisse is much smaller and untested. If you take thyroid medicine, ask your doctor before starting and whether your levels should be rechecked.
Why does L-carnitine cause fishy body odor?
Gut bacteria break carnitine down into trimethylamine, which smells fishy. The NIH says this odor and stomach upset usually appear at about 3 g a day. A single Neuralisse capsule holds a tiny fraction of that amount.
Is L-carnitine bad for your heart?
Gut bacteria convert carnitine to TMAO, which is linked with higher heart disease risk. A link does not prove carnitine causes heart disease. If you have heart disease, mention all supplements, including Neuralisse, to your doctor.
Can I take L-carnitine with valproic acid?
Valproic acid and some other seizure medicines can lower carnitine levels. Only your neurologist should decide whether you need carnitine and how much. Do not change your seizure medicine because of a supplement, and share the Neuralisse label at your next visit.
Who wrote this
Written and reviewed by
A small team that reads the bottle label line by line, checks every number against public health sources (NIH, NCCIH, MSKCC, FDA, FTC, CDC) and rewrites it in plain English. We do not write for the manufacturer, and we update a page whenever the label, the prices or the evidence changes.
Last updated . See our editorial standards and how we check reviews. This website is run by a U.S. authorized merchant, not by the manufacturer. This site is paid a commission when you buy through its order links.
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