Safety
Memocept Side Effects and Interactions to Know
Memocept side effects come from what its ingredients can do.
Arginine and citrulline may lower blood pressure, which matters if you take blood pressure medication, nitrates or sildenafil, and arginine is not advised after a recent heart attack. Stomach upset and headache are possible, and each capsule adds 7.5 mg NE of niacin.
If any of this applies to you, ask a doctor first and see who Memocept is for.
The short version
What side effects can Memocept cause?
Memocept has no safety study of its own, so its possible side effects come from what is known about its ingredients. The main ones are lower blood pressure, stomach upset, headache and, in theory, niacin flushing.
The amounts per capsule are small. Most side effects in the research showed up at gram-level doses, many times what one capsule holds. Small does not mean zero, though, and a few groups need a doctor's view before they start.
Memocept is a dietary supplement, not a drug. Arginine and citrulline can lower blood pressure: ask your doctor first if you take blood pressure medicine, nitrates or erectile dysfunction medicine, or if you have had a heart attack. Niacin is 47% of the Daily Value per capsule, so count it with any multivitamin. See side effects and interactions.
Every amount discussed below comes from the published panel. You can check each line on the Supplement Facts page.
Blood pressure
Can Memocept lower blood pressure?
It might, a little, in some people. Arginine and citrulline both help the body make nitric oxide, which relaxes blood vessels. Each capsule holds 400 mg of arginine and 200 mg of citrulline across two forms each.
In trials, 4 to 24 grams of arginine a day lowered systolic blood pressure by about 5.4 mmHg (Dong et al., 2011). Citrulline at 3 to 9 grams a day lowered it by about 4.1 mmHg (Barkhidarian et al., 2019). Memocept's amounts are far below those ranges.
For a healthy adult, a small drop is unlikely to be felt. The concern is people whose blood pressure is already being lowered by a drug. Adding anything that pushes the same way can tip it too low. Signs include dizziness, lightheadedness when standing up, and fainting.
Interactions
Who should check with a doctor before taking Memocept?
Anyone on medicine should ask first, as the label says. The table lists the groups where the ingredient sources give a specific reason.
| Situation | Why it matters | What to do |
|---|---|---|
| Blood pressure medicine | Arginine may lower blood pressure too much when combined (Mayo Clinic, L-arginine) | Ask your doctor first |
| Nitrates (nitroglycerin, isosorbide) | Same effect on blood vessels, added together (Mayo Clinic, L-arginine) | Ask your doctor first |
| Sildenafil or other ED medicine | May drop blood pressure too far with arginine (Mayo Clinic, L-arginine) | Ask your doctor first |
| Recent heart attack | Arginine not recommended; a trial was stopped early (Mayo Clinic, L-arginine) (Schulman et al., 2006) | Do not take it unless a cardiologist says yes |
| Pregnant or nursing | Excluded by the label | Do not take it |
| Under 18 | Excluded by the label | Do not take it |
| Any other medicine or condition | The label asks you to consult a physician | Bring the label to your doctor |
Heart history
Why is arginine a concern after a heart attack?
Mayo Clinic advises against arginine after a recent heart attack (Mayo Clinic, L-arginine). The reason traces back to one trial with a worrying result.
In 2006, 153 people who had just had a heart attack took 3 grams of arginine three times a day, or a placebo. Arginine showed no benefit. Six people on arginine died and none on placebo did, so the trial was stopped early (Schulman et al., 2006).
That trial used 9 grams a day, more than 20 times the arginine in one Memocept capsule. Nobody has tested whether a small dose carries the same risk. With a result like that, the safe path is clear: if you have heart disease of any kind, let your cardiologist decide.
Stomach and head
Can Memocept upset your stomach or cause headaches?
It is possible. Mayo Clinic lists nausea, diarrhea, bloating and headache as arginine side effects (Mayo Clinic, L-arginine). The NIH exercise fact sheet notes stomach upset mostly at 9 to 30 grams a day (ODS, Exercise supplements).
At 400 mg of arginine, stomach trouble is less likely, but people vary. Some are sensitive to any new capsule.
- Take the capsule with a meal, as the brand graphic suggests.
- Drink a full glass of water with it.
- If symptoms keep coming back, stop and talk to your doctor.
Niacin
Can the niacin in Memocept cause flushing?
Not at one capsule alone, in most people. Flushing is the reason the upper limit for niacin from supplements is set at 35 mg a day (ODS, Niacin). One Memocept capsule has 7.5 mg NE, well under that line.
The risk comes from stacking. Many multivitamins and B-complex products carry their own niacin. Add the numbers from every label you take.
| Source | Niacin | Running total |
|---|---|---|
| Memocept, 1 capsule | 7.5 mg NE | 7.5 mg |
| Example multivitamin | 20 mg | 27.5 mg |
| Example B-complex | 25 mg | 52.5 mg, over the limit |
| Upper limit from supplements | 35 mg | Set to avoid flushing (ODS, Niacin) |
Flushing feels like warmth, redness, itching or tingling in the face and chest. It usually fades within an hour.
Beta-alanine
Does the beta-alanine in Memocept cause tingling?
Unlikely at this amount. Tingling in the skin is the main side effect of beta-alanine, but it shows up at far higher doses (Trexler et al., 2015). The NIH sheet notes it from about 800 mg (ODS, Exercise supplements). Memocept has 40 mg, one-twentieth of that.
The label
What safety warnings are printed on the Memocept label?
The label carries two warning lines, quoted word for word below.
"Do not exceed recommended dose. Not for use by individuals under the age of 18 or pregnant or nursing mothers. Consult with a physician prior to use especially if you are taking a medication or have a medical condition."
The second line is in capitals: "KEEP OUT OF REACH OF CHILDREN. DO NOT USE IF SAFETY SEAL IS DAMAGED OR MISSING."
Check the seal each time you open a new bottle. If it is torn, loose or absent, do not take the capsules. Call +1 (507) 448-8190 with your order ID instead, so the desk can sort out a replacement or refund.
The label also asks you not to exceed the dose. Taking two capsules does not add proven benefit, and it doubles the niacin and amino acids.
If it happens
What should you do if you get a side effect from Memocept?
Stop taking it and note what happened. Most mild effects fade once you stop.
Stop the capsules
Do not take the next one until you know what caused the symptom.
Get help if it is serious
For fainting, chest pain or trouble breathing, call 911.
Tell your doctor
Bring the bottle so they can see every ingredient and amount.
Report it to FDA
Serious reactions to supplements can be reported through FDA's MedWatch program (FDA, Supplement Q&A).
Ask about a refund
Inside the window, call +1 (507) 448-8190 with your order ID. The refund policy has the steps.
Sources
Where do these Memocept safety facts come from?
Every safety point above links to a public source. None of them studied Memocept itself. They studied its ingredients, usually at much higher doses. For how the formula compares to those doses, see the ingredients page.
- Niacin: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements, 2022.Adult RDA 16 mg NE (men) and 14 mg NE (women); DV 16 mg. The upper limit for supplemental niacin is 35 mg, set to avoid skin flushing.
- Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements, 2026.Arginine studies used 2-20 g a day (most often 2-10 g); citrulline up to 6-9 g; beta-alanine 4-6 g a day, with tingling from about 800 mg. The sheet covers exercise, not memory.
- L-arginine. Mayo Clinic, 2026.Not recommended after a recent heart attack. With blood pressure drugs, nitrates or sildenafil it may drop blood pressure too low. Side effects include nausea, diarrhea, bloating and headache.
- L-arginine therapy in acute myocardial infarction: the VINTAGE MI randomized clinical trial. Schulman SP, et al. JAMA, 2006.153 heart-attack patients took 3 g of L-arginine three times daily or placebo; no benefit, 6 deaths on arginine vs 0 on placebo, and the trial stopped early.
- Effect of oral L-arginine supplementation on blood pressure: a meta-analysis of randomized, double-blind, placebo-controlled trials. Dong JY, et al. American Heart Journal, 2011.11 trials, 387 people, 4-24 g a day: systolic blood pressure fell about 5.4 mmHg and diastolic about 2.7 mmHg.
- Effects of L-citrulline supplementation on blood pressure: a systematic review and meta-analysis. Barkhidarian B, et al. Avicenna Journal of Phytomedicine, 2019.8 trials using 3-9 g a day for 1-17 weeks: systolic blood pressure fell about 4.1 mmHg; diastolic changed only at 6 g a day or more.
- International Society of Sports Nutrition position stand: Beta-Alanine. Trexler ET, et al. Journal of the International Society of Sports Nutrition, 2015.4-6 g a day for at least 2-4 weeks raises muscle carnosine and helps 1-4 minute efforts; the only reported side effect is tingling.
- Questions and Answers on Dietary Supplements. U.S. Food and Drug Administration, 2026.FDA does not have the authority to approve dietary supplements before they are marketed; structure/function claims need the standard FDA statement.
FAQ
Memocept side effects FAQ
Is Memocept safe?
No safety study of Memocept exists. The amounts are small compared with research doses, but people on blood pressure medicine, nitrates or ED medicine, or with heart disease, should ask a doctor first.
Can I take Memocept with blood pressure medicine?
Only if your doctor agrees. Arginine may add to the effect of blood pressure drugs and push your pressure too low.
Can I take Memocept with Viagra or Cialis?
Ask your doctor first. Mayo Clinic warns that arginine with sildenafil may lower blood pressure too much.
Does Memocept contain caffeine?
No caffeine is listed on the Supplement Facts panel or in the other ingredients.
Can Memocept cause headaches?
Headache is a listed side effect of arginine. If headaches start after you begin, stop and talk to your doctor.
Does Memocept interact with a multivitamin?
It adds 7.5 mg NE of niacin. Add that to your multivitamin's niacin and keep the total under 35 mg a day from supplements.
Is Memocept safe during pregnancy?
The label says it is not for pregnant or nursing mothers.
Keep reading
More about Memocept
Supplement Facts
Every line of the Memocept label typed out, with the math behind each Daily Value and the two label versions explained.
Read more
Who it's for
Who Memocept may suit, who the label rules out, and who should talk to a doctor before trying it.
Read more
How to use
The label directions word for word, the brand's timing tip, storage, and the doctor check for people who take medicine.
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