TB-500 user experiences: what users themselves report
Users’ own accounts, not research. The accounts are self-selected and prove neither that it works nor that it is safe.
This page does not list users’ doses or sellers, and no figure on it is a recommendation. Doses used in studies, with sources: TB-500 dosage in studies.
In short
Of 879 people, 546 (62%) said use that included TB-500 brought some benefit and 329 (37%) some harm.
We went through 1,989 public Reddit posts and a random sample of comments (1,500); the first-hand experiences of 879 users among them are compiled here. Method: Where the accounts come from and how we read them. Use of AI: AI disclosure.
- An AI model read and classified 1,989 public Reddit posts and 1,500 randomly chosen comments one by one, following written instructions. Leaving out posts that looked like marketing, 1027 were first-hand accounts, from 879 different people.
- Benefits mentioned most often: less pain (234, 27%), injury or tendon healed (175, 20%) and better mobility or function (116, 13%).
- Harms mentioned most often: injection site reaction (82, 9%), mood or anxiety (51, 6%) and fatigue or lethargy (39, 4%). In addition, 137 (16%) described some other, rarer harm. People tend to post when something goes wrong, so this share does not tell how common harms are.
- Comments reported benefit only clearly more often than posts (66% vs. 40%) and harms less often (26% vs. 47%). A possible reason is that people tend to post when something goes wrong: Posts vs. comments.
- Almost everyone used TB-500 together with BPC-157: 865 of 879 people (98%) used other substances at the same time, and 856 (97% of all) used BPC-157 specifically. So the figures describe TB-500 used with BPC-157, not TB-500 on its own.
- The accounts cannot separate the substance from placebo or other causes. What the research shows: TB-500: what the research shows.
Where the accounts come from and how we read them
Sources: the Reddit forums r/Peptides (491 accounts), r/bpc_157 (473), r/Biohackers (29), r/Retatrutide (13), r/TB500 (9), r/BPC157 (8), r/Nootropics (2) and r/Melanotan2 (2), 13 Oct 2024 to 4 Oct 2026. The posts were retrieved from a public Reddit archive. 4,817 posts matched the search, and 3,000 of them were taken at random. Of those, 1,989 were first-person posts about TB-500, and every one was read. In addition, 13,163 comments met the same criteria in the same period (two years, 13 Oct 2024 to 13 Oct 2026), and a random 1,500 of them were read. The sample was drawn with a fixed seed, so it can be repeated.
Coding: for each account we recorded the route, reported benefits and harms, how strong a harm was, whether and why the person stopped, length of use and other substances used at the same time. We kept accounts that reported some effect, some harm, or no effect. Questions and plans were left out. A harm was recorded when the person reported it during use, even if the cause was uncertain. Several posts by one person count as one person. One person can mention several things, so the shares in the tables do not add up to 100.
Check: an AI model read and classified the posts following written instructions. A second, separate AI run classified a random tenth (199 posts) again without seeing the first classification. The main fields matched: 197/199 (99%). 150 of the comments were re-classified the same way, and the main fields matched: 142/150 (95%). 9 posts looked like marketing and are not in the figures.
Whose accounts these are: routes mentioned: injection 366, nasal spray 11, by mouth 10, on the skin 2; the others did not say. The figures describe the writers and are not a recommendation. The products were not verified, so we do not know what people actually took.
Did TB-500 help? The overall picture
Of 879 people, 452 (51%) reported benefit only, 94 (11%) both benefit and harm, 235 (27%) harm only and 98 (11%) neither.
Stopping. We do not show the share who stopped on this page: when all posts were classified, finishing a planned course was partly recorded as stopping, so the figure would be too high.
| Overall picture: benefit, harm or neither | People | Share |
|---|---|---|
| Benefit only | 452 | 51% |
| Both benefit and harm | 94 | 11% |
| Harm only | 235 | 27% |
| Neither benefit nor harm | 98 | 11% |
Posts vs. comments
The figures on this page combine two sets: all 479 people who described their own use in a post, and 400 people found only in comments. 13,163 comments met the criteria, and a random 1,500 of them were read, from the same period as the posts: two years, 13 Oct 2024 to 13 Oct 2026. Because only part of the comments was read, the combined shares are not an average of the whole discussion.
Comments reported benefit only clearly more often, and harms less often, than posts. Benefit only: 40% in posts and 66% in comments (difference +25 percentage points, 95% confidence interval +19 to +32). Some harm: 47% in posts and 26% in comments (difference -21 percentage points, 95% confidence interval -27 to -15).
A possible explanation, which we have not verified: people tend to write their own post when something goes wrong, while replies often say briefly that it worked. Neither group tells how often it really helps or harms, and the difference does not prove that it works.
| Reported | Posts (n = 479) | Comments (n = 400) | Difference, points (95% CI) | Clear difference? |
|---|---|---|---|---|
| Benefit only | 40% (192) | 66% (262) | +25 (+19, +32) | Yes |
| Some harm | 47% (224) | 26% (103) | -21 (-27, -15) | Yes |
Most common reported benefits
Of 879 people. 546 (62%) mentioned some benefit; the table lists every benefit reported.
| Reported | People | Share |
|---|---|---|
| Less pain | 234 | 27% |
| Injury or tendon healed | 175 | 20% |
| Better mobility or function | 116 | 13% |
| Training recovery | 54 | 6% |
| Skin or scars | 52 | 6% |
| Less swelling or inflammation | 44 | 5% |
| Stomach or gut | 22 | 3% |
| Sleep | 19 | 2% |
| Hair | 14 | 2% |
| Other benefit | 163 | 19% |
Share = people / 879.
Most common reported harms
Of 879 people. 329 (37%) mentioned some harm; 54 said explicitly they had none.
| Reported | People | Share |
|---|---|---|
| Injection site reaction | 82 | 9% |
| Mood or anxiety | 51 | 6% |
| Fatigue or lethargy | 39 | 4% |
| Sleep problems | 32 | 4% |
| Pain got worse | 30 | 3% |
| Heart or blood pressure | 24 | 3% |
| Rash or itch | 24 | 3% |
| Headache | 21 | 2% |
| Dizziness | 14 | 2% |
| Flushing or heat | 13 | 1% |
| Nausea | 12 | 1% |
| Swelling or water retention | 12 | 1% |
| Flu-like feeling | 4 | 0% |
| Libido | 2 | 0% |
| Other, rarer harm | 137 | 16% |
| Harms mentioned but not named | 7 | 1% |
Share = people / 879.
How severe were the harms?
Of the 326 people who described how strong a harm was, 166 (51%) described it as mild, 143 (44%) as clearly bothersome and 17 (5%) as severe. The strength is the writer's own description, not a doctor's assessment.
| Strength of the harm as the writer described it | People | Share |
|---|---|---|
| Mild: minor and manageable | 166 | 51% |
| Clearly bothersome: several days, sleep or work affected | 143 | 44% |
| Severe: emergency visit, hospital or unable to function | 17 | 5% |
Harms known from research and regulators: What are the side effects of TB-500?
How long did people use TB-500?
558 of 879 people (63%) said how long they had been using it at the time of writing. Where one person wrote several posts, the longest stated time counts.
| Stated length of use | People | Share |
|---|---|---|
| Under a week | 123 | 22% |
| 1-4 weeks | 203 | 36% |
| 1-3 months | 194 | 35% |
| Over 3 months | 38 | 7% |
Many people post partway through, often in the first days or as soon as harms start, so short times are over-represented. The numbers describe the writers; they do not say how long it should be used.
Together with BPC-157
865 of 879 people (98%) used other substances at the same time. The most common: BPC-157 (856), GHK-Cu (276) and KPV (171). Then the account cannot tell which substance had the effect.
So the figures describe TB-500 used with BPC-157, not TB-500 on its own. TB-500 and BPC-157 were often in the same ready-made blend. Accounts from BPC-157 users are compiled on their own page, and many of them also used TB-500: BPC-157 user experiences. On blends: the Wolverine blend.
About dosing
We do not repeat the amounts or ways of use people mention, and we give no dosing or how-to instructions. A safe dose is not known. Doses used in studies, with sources: TB-500 dosage in studies. Legal status: Is TB-500 legal in Finland?
What can be concluded?
The accounts show why the combination interests people: many say pain eased or an injury healed. They also show what is worth studying: the harms reported most often were injection-site reactions, mood changes or anxiety, and tiredness. They cannot separate TB-500 from BPC-157.
The accounts prove neither that it works nor that it is safe. The writers are self-selected, the product contents are unknown, many used several substances at once, and placebo effects can be large. The research and its evidence levels: TB-500: what the research shows.
Quotes
Short excerpts in the writers’ own words. Writers’ names and links are not shown. We picked quotes from every group: benefit, both benefit and harm, no effect, harms and people who stopped.
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"The combo has been effective in that It has improved my situation considerably - pain/discomfort still there but much less."
r/bpc_157, 2025-03, Injections with BPC-157, a cycle of about three months for an achilles injury of more than eight years. Pain clearly less but not gone.
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"I have full range of motion and I'm actively using my bicep everyday with NO pain and NO range of motion issues."
r/Peptides, 2024-12, Injections with BPC-157, about six weeks after bicep tendon surgery. Says doctor and physical therapist find recovery ahead of schedule.
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"My knees improved so much by week 4. Recently though, I’ve started getting more overall joint aches, especially in areas where I’ve had old injuries before."
r/bpc_157, 2026-09, BPC-157/TB-500 blend for about six weeks, route not stated. Knees and pain improved and falling asleep got easier, but old injury sites started aching.
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"4 months on it, even today. Nothing noticeable when I'm honest with myself about it."
r/Peptides, 2026-08, BPC-157 + TB-500 for about four months and still using it. No noticeable effect; the writer compares it with other substances tried.
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"it'll be sore and hurt for hours after, sometimes the whole day. I also get bruises and lumps under my skin that can take 5 days to go away."
r/Peptides, 2026-02, KLOW blend (GHK-Cu, BPC-157, TB-500, KPV) injected into the thigh for about five weeks. Injection site pain, bruises and lumps; partner had no reaction.
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"Within about 1 week I had a very high fever, extreme body aches, extreme fatigue and nightly headaches."
r/bpc_157, 2025-07, BPC-157/TB-500 blend under the skin for bicep and rotator cuff injuries. Within about a week fever, aches, fatigue and headaches, sent to the ER, tests normal. Stopped and is afraid to restart.
Other summaries made with the same method: BPC-157 user experiences, GHK-Cu user experiences, KPV user experiences, WOLVERINE blend user experiences, GLOW blend user experiences, KLOW blend user experiences and user experiences with collagen and skin peptides.
Content is general information about research, not medical advice. If you have symptoms, contact a healthcare professional.