PepRank

Carnosine

43%positive15 reports

Also: L-carnosine · beta-alanyl-L-histidine

CleanSupplementEnergyLongevityOral

Dietary antioxidant dipeptide; small memory benefits in elderly trials, mild if any.

AH · β-alanine, not L-alanine (β-alanyl-L-histidine) (2 residues)

AH β-alanine, not L-alanine (β-alanyl-L-histidine)

#13 of 23 supplements · updated
Access
Supplement
Cost / month
≈ €12–36
at 0.5–1.5 g/day · MOLEQLAR · €0.80/g
OralFelt in 24 h – 2 days

Builds over days or weeks of regular use rather than with each dose.

15 user reports
Glowing 1Positive 5Mixed 3Nothing 3Negative 3

  • r/Supplements· · 39 upvotesOriginal ↗

    Lately I have started using L-Carnosine (500mg per day). Immediate benefits I have seen are a substantial increase in mental energy/wakefulness. I don't feel fatigued at around 3pm anymore. My ability to articulate and express my thoughts have increased significantly.

    GlowingEnergy · 500 mg/day · Oral

    minor anxiety

  • r/over30skincare· · 30 upvotesOriginal ↗

    I've been taking 1,000 mg of carnosine daily ever since, and I don't intend to ever stop taking it. Obviously there are other things that come into play, and I don't know how much credit to give carnosine, but I really haven't aged.

    PositiveSkin & hair · 1000 mg/day · Oral · 8 years

    anti-glycation after microneedling

  • r/covidlonghaulers· · 8 upvotesOriginal ↗

    I tried L Carnosine and it made my brain fog and head pressure infinitely worse.

    NegativeRecovery · Oral

    long COVID

Users report
Little Reddit discussion (under 20 first-hand reports, against far more about zinc-L-carnosine, a gut product). About half report a clear benefit: daytime energy, steadier blood sugar after carb-heavy meals, or anti-aging use they are happy with. A fifth feel nothing. A steady minority react badly within days: head pressure, a 'stressed' or irritable brain, worse brain fog (histamine-sensitive and long-COVID users), insomnia even with a morning dose, or low mood after months.
Best effects
Mental energy, less afternoon fatigue (anecdotal) · verbal fluency (anecdotal) · possible small memory benefit in elderly (RCT)
Downsides
Usually no noticeable effect · occasional overstimulation or anxiety (isolated)
Evidence
Human RCTs — Small; anserine/carnosine in elderly
Caveat
It is a food constituent (meat), sold as an ordinary supplement, and gets the cleanest safety profile here. Expect little subjective effect.
Typical use
500-1500 mg/day oral (trials used 1 g anserine/carnosine 3:1).
Getting it
Over-the-counter L-carnosine capsules or powder; not zinc-L-carnosine, which is a stomach product.
Stacked with
Reduced glutathione or NAC: Pushed by Nootropics Depot staff to slow carnosinase breakdown so 500 mg goes further; one user ties the combination to low mood after long use. · Anserine: The 3:1 anserine/carnosine chicken-extract formula used in the Japanese memory trials. · Benfotiamine and alpha-lipoic acid: Common anti-glycation stack among diabetics and anti-aging users; the one diabetic who reported on it could not tell whether it helped.

User reports 17

  • r/Supplements· · 39 upvotesOriginal ↗

    Lately I have started using L-Carnosine (500mg per day). Immediate benefits I have seen are a substantial increase in mental energy/wakefulness. I don't feel fatigued at around 3pm anymore. My ability to articulate and express my thoughts have increased significantly.

    GlowingEnergy · 500 mg/day · Oral

    minor anxiety

  • r/over30skincare· · 30 upvotesOriginal ↗

    I've been taking 1,000 mg of carnosine daily ever since, and I don't intend to ever stop taking it. Obviously there are other things that come into play, and I don't know how much credit to give carnosine, but I really haven't aged.

    PositiveSkin & hair · 1000 mg/day · Oral · 8 years

    anti-glycation after microneedling

  • r/Supplements· · 2 upvotesOriginal ↗

    It works great anti-anxiety

    PositiveAnxiety · Oral

  • r/Supplements· · 2 upvotesOriginal ↗

    Helps me with bloodsugar, so high carb meals won't knock me out like before supplementation. Also, I lost more than 10 pounds of water retention.

    PositiveMetabolic · 500-2000 mg/day · Oral

  • r/NootropicsDepot· · 2 upvotesOriginal ↗

    I took that stack post long term amphetamine use and I believe it sped my recovery up compared to other times I've gone through amph withdrawal.

    PositiveRecovery · Oral

    post long-term amphetamine use; stack with spirulina, blueberry and vitamin D

  • r/NootropicsDepot· · 1 upvotesOriginal ↗

    I don't get this negative effect at all. If anything the opposite. But I take a liposomal glutathione and NAC.

    PositiveMood · Oral

    taken with liposomal glutathione and NAC

  • r/NootropicsDepot· · 1 upvotesOriginal ↗

    I love carnosine but after sustained use i sometimes notice low mood.

    MixedOral · sustained use

  • r/Supplements· · 1 upvotesOriginal ↗

    It gave a me a great boost of energy and increased my cognitive faculties. I would take it in the morning but at night it would be almost impossible for me to get more than 3 hours of sleep on it, even after taking Doxylamine Succinate and Melatonin.

    MixedLongevity · 1000 mg/day · Oral

  • r/covidlonghaulers· · 1 upvotesOriginal ↗

    3-4 years ago when I was first sick and unmedicated, it made my brain fog much worse. Now that I am on an antihistamine/anti-inflammatory/anti-platelet polypharmacy I seem to tolerate low doses and it has some benefit overall. Like it seems to make me dizzier but also improve my recall.

    MixedMetabolic · 1000 mg/day, later 250-500 mg not daily · Oral

    long COVID with MCAS and POTS

  • r/Supplements· · 3 upvotesOriginal ↗

    I consume a number of supplements that are considered to be effective against AGE's, including carnosine. However, at age 71, with type 2 diabetes, I cannot say definitively that any of the supplements that are supposed to impact AGE's are actually doing an effective job.

    NothingMetabolic · Oral

    type 2 diabetes, age 71, large anti-AGE stack

  • r/autism· · 1 upvotesOriginal ↗

    I didn't stick with it, it might help but I think you need to try it for a long time.

    NothingSocial · Oral

    autistic child (parent report), with vitamin D

  • r/Supplements· · 1 upvotesOriginal ↗

    I used to take it but didn't notice an impact. I am much older now, so it's worth trying again.

    NothingOral

  • r/covidlonghaulers· · 8 upvotesOriginal ↗

    I tried L Carnosine and it made my brain fog and head pressure infinitely worse.

    NegativeRecovery · Oral

    long COVID

  • r/Supplements· · 3 upvotesOriginal ↗

    I've been taking plain L-carnosine powder from Bulk Supplements for the past 3 days, and I've noticed a really strange feeling in my head that's hard to describe. The closest way I can explain it is that it feels like I'm under stress, even though nothing stressful is happening.

    NegativeAnxiety · Oral · 3 days

    OCD

  • r/Supplements· · 2 upvotesOriginal ↗

    I have been having a feeling of stress in my head that is almost like a pressure since I began taking it 3 days ago. I'm usually in a good mood and easy to get along with but my husband is saying I'm suddenly acting angry and argumentative for no reason for the last 3 days..

    NegativeOral · 3 days

    suspects histamine sensitivity

  • r/LongCovid· · 16 upvotesOriginal ↗

    i took a supplement that contained L-Carnosine and it was like revving into 5th gear for me.

    GlowingEnergy · 1-2 capsules/day · Oral · vendor-adjacent

    post-COVID fatigue, also started iron

  • r/NootropicsDepot· · 2 upvotesOriginal ↗

    I personally can get overstimulated with it, if I have a lot of other AMPK activating things in my stack.

    MixedLongevity · morning, with reduced glutathione · Oral · vendor-adjacent

    Nootropics Depot staff account

Safety

Tier by safety barStrict CleanBalanced CleanEvidence only Clean

Seen harmMechanismData gapSilent harmProduct

Seen harm 0/3
Small RCTs report no serious side effects, though one schizophrenia trial at 2 g/day had more unspecified adverse events (30% vs 14%); first-hand reports describe head pressure and irritability, none serious. Chengappa et al. 2012: L-carnosine 2 g/day in schizophrenia, n=75 (PubMed 23099060) ↗L-carnosine in diabetic nephropathy, RCT: no serious side effects (PubMed 34174842) ↗
Mechanism 0/3
A dipeptide eaten daily in meat and broken down by serum carnosinase; no pathway to serious harm is known.
Data gap 1/3
A food constituent sold for decades as a supplement, with RCTs adding up to several hundred people, but no formal GRAS or EFSA safety assessment. Histidine-containing dipeptides and delayed recall: meta-analysis of 10 RCTs, n=730 (Nutr Rev 2023) ↗
Silent harm 0/3
Reported effects (overstimulation, head pressure) are felt within days and fade on stopping.
Product 0/3
OTC L-carnosine capsules or powder.

Where to buy 2 in Europe · 7 total

ShopFormPricePer mgTesting
Nootropics DepotUScapsules · 90000 mg€6369.99 USD€0.70/gOwn COA
Nootropics DepotUSpowder · 60000 mg€4549.99 USD€0.75/gOwn COA
MOLEQLAREU · DEpowder · 30000 mg€24€0.80/gThird-party tested
iHerbUScapsules · 50000 mg€41€0.82/gNo public tests
Nootropics DepotUScapsules · 30000 mg€2729.99 USD€0.90/gOwn COA
Nootropics DepotUSpowder · 30000 mg€2729.99 USD€0.90/gOwn COA
SupersmartEU · LUcapsules · 45000 mg€72€1.60/gOwn COA

Studies 6

Sources 2

More in Focus & memory all 7 →

  1. 1N-Acetyl Semax Amidate MEHFPGP (7 residues) Caution Nasal / Injection≈ €4.8–14 / month55%positive48 reportsStabilised, stronger, longer-acting Semax; same use (focus, mental energy).
  2. 2Semax MEHFPGP (7 residues) Caution Nasal / Injection≈ €24–73 / month52%positive51 reportsMild non-stimulant focus and mental-stamina aid; used for stroke recovery in Russia.
  3. 3Adamax MEHFPGP (7 residues) Caution Nasal / Injection≈ €23–92 / month47%positive28 reportsVendor-invented adamantyl Semax variant; stronger, longer focus per users.A novel molecule with no published animal or human safety data, sold only by grey-market vendors.
  4. 4Noopept CautionPeptide-derived Nasal / Sublingual / Oral≈ €0.34–0.68 / month39%positive50 reportsDipeptide-derived racetam-like nootropic; mild focus and creativity aid, cheap.
  5. 5Cerluten CautionSupplement Oral≈ €49–110 / month3/10estimateKhavinson oral calf-brain peptide extract (Cytomax A-5); one in-house report, no first-hand users found.
  6. 6Orexin-A (intranasal) EPLPDCCRQKTCSCRLYELLHGAGNHAAGILTL (33 residues) Excluded Nasal1/10estimateWake-promoting neuropeptide; tiny narcolepsy studies, no consumer track record.Essentially untested, with sympathetic activation and no reliable product.

Sequence beads

Each bead is one amino acid in the peptide's chain, coloured by its side chain: grey for non-polar, cyan for polar, blue for positively charged and fuchsia for negatively charged. Length and mix tell related peptides apart at a glance, from a two-residue dipeptide like carnosine to a 43-residue protein like thymosin beta-4. The colours describe chemistry only and predict neither effect nor safety.

non-polarpolarpositivenegative

Report grades

Every first-hand Reddit or X report is graded on its own, from glowing through positive, mixed, nothing and negative to bad reaction, and the bar shows how those grades split. Posts that look vendor-adjacent stay on the peptide's page but are left out of the counts.

GlowingPositiveMixedNothingNegativeBad reaction

% positive

The share of a peptide's graded Reddit and X reports that are glowing or positive, vendor-adjacent posts left out. A peptide with few reports is pulled toward the average of all reports, as if it had eight average ones besides its own, so two glowing posts cannot top the list. Kept peptides rank by the same reports' mean grade, shrunk the same way, and excluded ones follow in that order.

Researcher estimate

No first-hand report of this peptide has been graded yet, so the figure is the researchers' own rating out of 10 from what they read about it. It ranks alongside the computed scores until reports arrive.

Safety tier

Each peptide is tiered clean, caution or excluded from its five risk axes under the chosen safety bar. An excluded peptide has a plausible route to serious harm, so it stays listed with the reason but ranks behind every other entry, however good its reviews.

Safety bar

The safety bar sets how much risk it takes to exclude a peptide. Strict: out on any serious mechanism with little human data, or any documented serious harm. Balanced: out on documented serious harm (unless it is obvious, reversible and from a regulated product), or a serious mechanism whose harm would be silent with no human data at all. Evidence only: out only on documented serious harm in humans that is lasting, delayed or from grey-market product.

Seen harm

Documented serious adverse events in humans, from 0 for none despite real exposure to 3 for deaths or several well-documented serious harms. Serious means a hospital or emergency visit or harm lasting weeks, so a headache or a bad night does not count.

Mechanism

A plausible biological route to serious harm at the doses people use, such as growth-factor signalling, hormone-axis suppression, heart or blood-pressure effects or immune activation. It runs from 0 when none is known to 3 when a dangerous pathway has been shown in living animals.

Data gap

How little human safety data exists for the molecule actually sold, from 0 for an approved drug with large trials and years of use to 3 for no human safety data at all. A modified analogue does not inherit its parent's trials.

Silent harm

Whether the feared harm would show quickly or stay hidden, from 0 when it is obvious and goes on stopping to 3 when it is silent and delayed, like tumour promotion or slow organ damage. User reports cannot reveal a harm that takes years to appear, so a high score here limits what good reviews can tell you.

Product

The risk of what people actually buy, from 0 for a regulated pharmacy or supplement product taken by mouth or on the skin to 3 for a grey-market injectable. In one dataset of 6,441 grey-market samples, 42–71% failed basic quality criteria and 15% carried endotoxin.

Evidence

The strongest kind of study behind the peptide's effects, from an approved drug through human controlled trials and small human studies to animal work or nothing of its own. Animal results often fail to carry over to people.

Access

How people get it: as an approved drug, a compounded prescription, an over-the-counter supplement or from the grey market, where nobody checks the vial. The channel decides both the legal position and the risk of a bad batch.

Price per month

Thirty days of the typical dose, from its low end to its high end, priced at the listing a careful buyer would choose: in stock, from a shop scoring 4 of 5 on trust (third-party tested where no score is set), failing that 3, a pure pack before a blend, a European shop first, then the cheapest per mg. The range is the dose's, not the shops'. A per-dose amount counts once a day unless the dose says otherwise. Prices are in euros at ECB rates of 2026-10-29, before shipping; the shop table keeps each listing's price per mg, per gram for bulk supplements. Where no listing can be priced the researchers' own estimate stands in, and says so.

Dose users report

The middle half of the daily doses stated in at least five first-hand reports, vendor posts left out. Where its middle sits more than twice above or below the declared dose, the month is priced at it as well, since what people take is what they pay for.

Testing

Whether the shop publishes lab results: third-party tested means an independent lab checks each batch, own COA means the shop's own certificate of analysis, and no public tests means neither. A certificate shows purity, not safety.

Added peptide

Some packs sold under one peptide's name hold a second one, such as 5 mg GHK-Cu in a nasal kit, stated only in the description. Sprayed in the nose or injected it reaches the blood like an injection, so it carries the risk of that route and is tiered as the injectable form, whatever its tier on the skin. A pack whose page gives no contents list may hold more than its name.