Ingredient profile
Acetyl-L-Carnitine in MemoPryl: What the Memory Research Shows
Acetyl-L-carnitine is listed on MemoPryl's brand graphics as N-acetyl L-carnitine HCl. Trials in mild cognitive impairment and mild Alzheimer's used 1 to 3 g a day and found short-term gains that faded by one year, and NIH says routine use is not justified (NIH ODS, Carnitine). How much MemoPryl contains has not been published.
Written by the MemoPryl editorial teamUpdated
The basics
What is acetyl-L-carnitine?
Acetyl-L-carnitine is a form of carnitine, a nutrient the body uses to turn fat into energy inside its cells. The "acetyl" part is a small chemical group that sets it apart from plain L-carnitine.
Your liver and kidneys make carnitine, and meat, fish and milk supply more (NIH ODS, Carnitine). Most people do not need a supplement to get enough. The acetyl form drew research interest for one reason: scientists wanted to know whether it could help people whose memory was already slipping.
| Label name | N-Acetyl L-Carnitine HCl |
|---|---|
| Scientific name | Acetyl-L-carnitine hydrochloride |
| What it is | Amino acid derivative |
| Position in the list | 3 of 8 (no Supplement Facts panel with amounts was available to us) |
| Per serving | Not shown in our materials |
| Amount used in research | 1-3 g a day in dementia and MCI trials |
| Strength of evidence | Mixed; not routine use |
| Traditional or marketed use | Carnitine form studied in mild cognitive decline |
| Main caution | Around 3 g a day: nausea, cramps, fishy odor; seizure risk in seizure disorders. |
The label name "N-Acetyl L-Carnitine HCl" means the same compound bound to hydrochloride, a common way to make it stable in a capsule.
On the bottle
Where does acetyl-L-carnitine appear on the MemoPryl label?
It appears on the brand graphics and in the eBay item specifics, where the seller puts it among the active ingredients (eBay listing, MemoPryl). Neither source gives an amount.
The brand graphic "What MemoPryl supports" pairs the formula with the claim "Supports Concentration*". That asterisk points to the FDA statement. It is a marketing line, not a study result, and no trial of the full MemoPryl formula has been published.
- Named on both the brand graphics and the seller's list
- Listed as an active ingredient by the eBay seller
- No milligram amount in any material we have
Compare it with the other seven names on the full ingredient list, or read what we know about the missing Supplement Facts panel.
The evidence
Does acetyl-L-carnitine improve memory?
Only a little, only for a while, and only in people who already had memory problems. Two large reviews tell most of the story.
| Review | Who and how much | What it found |
|---|---|---|
| 2003 meta-analysis | 21 trials, 1,204 adults with mild cognitive impairment or mild Alzheimer's; 1.5 to 3 g a day for 3 to 12 months | Better test scores than placebo |
| Cochrane review | 15 trials; 1 to 3 g a day | Gains at 12 and 24 weeks; no gain left at 52 weeks |
| NIH conclusion | Both reviews together | Routine clinical use is not justified; the overall effects are unclear |
The pattern matters. A benefit seen at three and six months but gone by one year is weak support for long-term use. The people studied also had a diagnosis, not ordinary forgetfulness.
Two other ingredients have a similar record of small effects: phosphatidylserine and bacopa.
In four numbers
What do the acetyl-L-carnitine studies add up to?
Dose check
How much acetyl-L-carnitine is in MemoPryl?
The figure is missing. Neither label version's Supplement Facts panel was available to us.
The trials used 1 to 3 grams a day. That is 1,000 to 3,000 milligrams of a single ingredient. MemoPryl shares its capsule with seven other named ingredients, and the serving size is not public either.
| Question | Research | MemoPryl |
|---|---|---|
| Daily amount | 1 to 3 g (NIH ODS, Carnitine) | Not published |
| Length of use | 3 to 12 months | Not published |
| Capsules per day | Varied by trial | Not published |
| Who took it | Adults with mild cognitive impairment or mild Alzheimer's | Adults 18+ (brand graphic) |
A name on a list does not tell you the dose. Ask the seller for a photo of the back panel, and follow the serving printed on your bottle. Our safety page covers the whole formula.
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Order nowSide effects
What are the side effects of acetyl-L-carnitine?
At about 3 grams a day, people report stomach trouble and a fishy body odor (NIH ODS, Carnitine). MemoPryl's dose is unknown.
Stomach and odor
Nausea, vomiting, stomach cramps and diarrhea, plus a fishy body odor.
Seizures and kidney failure
Seizures have been reported in people with a seizure disorder. People with uremia, a waste buildup from kidney failure, may get muscle weakness.
Talk to your neurologist before any product with acetyl-L-carnitine. Keep taking your prescribed medicine until you have an answer.
Interactions
Does acetyl-L-carnitine interact with seizure medicine?
Yes, in one direction. Valproic acid and other anticonvulsants can lower the body's carnitine levels (NIH ODS, Carnitine).
That is the main drug note for this ingredient. In MemoPryl it lands next to a bigger one. St. John's wort, in the same capsule, can weaken some seizure drugs, including phenytoin and carbamazepine (NCCIH, St. John's wort).
| Medicine | Ingredient | What can happen |
|---|---|---|
| Valproic acid and other anticonvulsants | Acetyl-L-carnitine | The drugs lower carnitine levels (NIH ODS, Carnitine) |
| Phenytoin, carbamazepine | St. John's wort | The herb can make these drugs work less well (NCCIH, St. John's wort) |
| Any seizure medicine | Whole formula | Ask your prescriber first; amounts are not public |
Never stop or change a dose on your own. A missed or weakened seizure medicine can be dangerous.
Our take
Is acetyl-L-carnitine a good reason to choose MemoPryl?
It is one of the better-studied names in the formula, but the studies point to a modest, short-lived effect.
In its favor
- Real human trials, pooled in two reviews
- Short-term gains seen at 12 and 24 weeks
- Side effects are mostly stomach trouble at high doses
- Named openly on the brand graphics
Against it
- No gain left at 52 weeks
- NIH: not justified for routine use
- Trials used grams, and MemoPryl's amount is unknown
- Studied in people with a diagnosis, not everyday forgetfulness
Want to know when anything might change? Read the honest results timeline.
Next step
What should you check before taking MemoPryl for its acetyl-L-carnitine?
Find the amount
Look for a milligram figure on your bottle's back panel. No figure means no way to compare with the trials.
Review your medicines
Bring the bottle to a pharmacist, especially if you take seizure medicine or any prescription at all.
Set a fair test
The listing allows returns for 30 days. Note how you feel before the first capsule and again before that window closes.
FAQ
Acetyl-L-carnitine questions
Is acetyl-L-carnitine good for memory?
Only modestly, based on current reviews. Trials in people with mild cognitive impairment or mild Alzheimer's found better test scores at 12 and 24 weeks, but not at 52 weeks (NIH ODS, Carnitine). NIH says routine use is not justified, and no study has looked at MemoPryl's own formula or amount.
What is the difference between acetyl-L-carnitine and L-carnitine?
Acetyl-L-carnitine is L-carnitine with an acetyl group attached. Both are forms of the same nutrient the body uses for energy. The memory trials summarized by NIH used the acetyl form, which is the form MemoPryl's brand graphics name as N-acetyl L-carnitine HCl (NIH ODS, Carnitine).
What is the acetyl-L-carnitine dosage for memory?
Research used 1 to 3 grams a day, usually for 3 to 12 months (NIH ODS, Carnitine). That is a research range, not a recommendation. For MemoPryl, follow the serving printed on your bottle, since we have not seen a Supplement Facts panel showing how much acetyl-L-carnitine it holds.
What does acetyl-L-carnitine do for the brain?
It helps cells turn fat into energy, and that role made researchers test it for memory decline. In people who already had memory problems, the effect was small and faded within a year (NIH ODS, Carnitine). No trial shows it changes memory in healthy adults taking a mixed supplement.
Can acetyl-L-carnitine cause seizures?
It can in people who already have a seizure disorder, according to NIH (NIH ODS, Carnitine). If you have epilepsy, ask your neurologist before trying MemoPryl. The formula also contains St. John's wort, which can weaken some seizure drugs, so the check matters twice.
Why does acetyl-L-carnitine cause a fishy smell?
A fishy body odor is a known side effect at around 3 grams a day, along with nausea, cramps and diarrhea (NIH ODS, Carnitine). MemoPryl's amount is not public, so whether a capsule reaches that level is unknown.
How much acetyl-L-carnitine is in a MemoPryl capsule?
That figure is not shown in any material we have. The brand graphics and the eBay seller name the ingredient but give no amount. Ask the seller for a photo of the back panel before comparing MemoPryl with the 1 to 3 gram doses used in trials.
Who wrote this
Written and reviewed by
Plain-language pages built from the label, the sales page and linked public health sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by a U.S. stocking partner that sells MemoPryl, not by the maker (the pack shots say "By NutraVibe"). We earn money when you buy through our order links.
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