TB-500 Thymosin Beta 4: Benefits, Risks & Dosage

I'm a 50-year-old PT with a cranky right shoulder and left tennis elbow. I ran TB-500 subQ only for 8 weeks: 3 mg daily for 6 weeks, then 5 mg daily for the last 2. I also did dead hangs, resistance bands, and high-rep 25 lb dumbbells. Right shoulder pain went from 7/10 to basically 0. The random hand numbness stopped, and my left tennis elbow is gone. Only side effect was mild redness at a few injection sites. I'm cycling off now and hoping it sticks. If you try it, add rehab work too.

Ran TB-500 for a nagging right shoulder tendon thing from too many years at a desk and bad gym form. Started at 2.5mg twice a week for 4 weeks, then 2.5mg once weekly for another 4. By week 5 my pain went from a solid 6/10 to about 2/10, and I could sleep on that side again. Some mild fatigue and a headache after the first couple pins, nothing else. Recovery between lifting days felt maybe a day faster. Stuck with my own plan after a doctor online kept pushing a 3-month doubled-up run; the constant upselling turned me off completely.

I'm 50, a realtor, so I'm in and out of the car and on my feet at showings all day. I've done 142 injections of TB-500 at 5 mg each, mostly in my thighs, over about five months. I haven't noticed anything dramatic. Maybe my knees feel slightly less stiff after a long day, but honestly it could be nothing. Nobody has commented either way. The shots give a sharp bee-sting burn, and both thighs have a perma-bruise that won't quit. I'll keep going since I'm not getting any younger, but I expected more for the price.

I’m 41 and a teacher, not an athlete or anything. I ran TB-500 at 2.5 mg twice a week for two weeks, then 2.5 mg once a week for six more. Around week three my cracked heels were about 80% smoother, no bleeding after standing all day. A small kitchen burn closed in four days instead of the usual ten. Skin looks a bit more even, maybe 25% less redness. I didn’t have much gray, but new growth seems less noticeable. First few shots gave me a mild headache and some tiredness for a day. No injection pain. I’ll keep using it, though it’s pricey.

I'm 55, a warehouse manager with chronic tennis elbow/tendinopathy. Week 6 of a KLOW stack: twice daily near the elbow, 0.25 mg BPC/TB-500/KPV plus 1.25 mg GHK-Cu, total daily 0.5 mg BPC/TB-500/KPV and 2.5 mg GHK-Cu. So far underwhelming. Pain went from 7/10 to maybe 5/10, grip still weak lifting boxes. No redness, bruising, or fatigue. I'll finish 8 weeks, take 4 off, maybe run another 8. Not a miracle for chronic tendon issues yet, but mild help.

I've logged 142 injections of 5 mg TB-500, pinning twice weekly for about 16 months. As a nurse I pay attention to my body, and honestly I can't point to any clear change. Nobody at work or home has commented either way. The shot itself has a sharp bee-sting burn in my thigh, and both thighs now have a stubborn bruise that never really fades. No fever, no redness beyond that. I'll keep going because I'm 43 and not getting any younger, and the safety side seems okay. Maybe subtle, but not obvious.

I'm 52, an accountant, not cycling or lifting heavy. Ran TB-500 at 2 mg twice a week for 6 weeks. Heels were my main issue, dry, cracked, sore in shoes. Now maybe 80% better, way smoother. A thumb paper cut healed in 3 days instead of the usual 6-7. Skin looks fresher, more even. I only had a few greys, but they seem less noticeable around the temples. Side effects: mild tiredness for a day after the first two pins, nothing since. No injection lumps. I'd buy again.

47-year-old paramedic here. I ran TB-500 for 6 weeks at 5 mg daily, split into 2.5 mg AM and 2.5 mg PM. My chronic shoulder tendinitis went from a 7/10 most mornings to about a 3/10, and knee swelling after 12-hour shifts dropped enough that stairs weren't miserable. Wound healing on a scrape seemed faster, maybe 4 days instead of 7. I did get mild injection-site redness and a couple headaches the first week. Gut stuff was unchanged. Higher dosing might work better, but I stayed put. Not medical advice, just my experience.

I'm a 41-year-old graphic designer and had nagging right shoulder pain plus left tennis elbow. I did 8 weeks of subQ TB-500. First weeks 3mg daily, bumped to 5mg daily the final 2 weeks. Also did rehab: resistance bands, dead hangs, high-rep dumbbells capped at 25lb. By week 6 my shoulder pain was basically gone, the random hand numbness stopped, and my elbow felt normal. No real side effects, maybe a little tired after the 5mg doses. Cycling off now, hoping it sticks. Definitely pair with rehab.

I'm 43, in grad school, so sleep and stress aren't great. I've run TB-500 five times now: 2.5 mg subQ twice a week for 8 weeks, then 3 weeks off. Around week 8 I hit a plateau, so that break seems right. Elbow tendon pain went from 7/10 to about 3/10 by week 6, and between lifting sessions I bounce back faster. My skin is still slowly improving too, less dryness, maybe 25% better, and old scars look calmer each round. Only sides: mild redness at injection sites for a day, slight headache first week. No major issues.

49-year-old female fitness coach here. I had the same nagging shoulder stuff plus left tennis elbow. Ran TB-500 for 8 weeks, subq only. First six weeks 3mg daily, then bumped to 5mg daily for the last two. Kept doing my rehab: dead hangs, resistance bands, and light 25lb dumbbells for high reps. Right shoulder pain is gone, my hand doesn’t randomly go numb anymore, and the tennis elbow cleared up. Only issue was some minor bruising at injection sites. I’m cycling off now and hope it sticks. Definitely pair it with rehab exercises.

I'm 41 and sit at a desk all day, so my right shoulder tendon was a mess. First run: 2.5 mg TB-500 twice weekly for 4 weeks. By week 5, pain went from 7/10 to 3/10 and I could reach overhead without wincing. Second run I bumped to 5 mg once weekly for about 3 months after a clinician suggested it. Recovery after gym sessions felt faster. Side effects: mild dizzy rush for 10 minutes and a couple of small bruises. Didn't notice gut benefits. The constant sales pitch around this stuff is irritating.

I’m 41 and teach 7th grade, so I’m on my feet all day. I did 2.5 mg TB-500 twice a week for 6 weeks, then once a week for 2 more. Not cycling anything else. My plantar heel pain went from a 7/10 most mornings to maybe 2/10. A deep cut on my thumb closed in about 4 days instead of the usual 10. My skin looks more even, and my hairdresser noticed fewer greys. Only side effect was a little redness at injection sites and one mild headache. I’ll keep using it occasionally.

I’m a 36-year-old teacher and started TB-500 on May 9. I injected 2 mg twice a week for about 10 weeks. My main issue was a stubborn elbow tendon thing that made writing on the board annoying. By week 4 the ache had dropped from maybe 6/10 to 3/10. By week 8 it was around 1-2/10 most days, and I recovered faster after workouts. Even a small paper cut seemed to close up quicker. Injection sites sometimes got a little red and itchy for a day. No big side effects. Results were gradual, not overnight. I’m taking a break now but would use it again. Value is okay if you catch a sale.

Started TB-500 about 10 weeks ago. Did 2.5 mg twice a week for the first 6 weeks, then 2.5 mg once a week. I'm a trainer so shoulders and elbows take a beating. My right elbow pain went from a 7/10 on presses to maybe 3/10. Shoulder tightness is way better, and I can do overhead work again without that pinchy feeling. Small scrape on my shin also healed faster than usual. First week I had mild headaches and a little redness at injection sites, nothing major. Recovery between sessions feels quicker. Not magic, but steady. Thinking about a 2-week break soon. Worth it for me.

28F, not cycling, just a stressed grad student. Did 2.5mg subQ twice a week for 5 weeks, then once a week for two more. By day 10, the painful cracks on both heels were basically gone. A kitchen cut that usually takes 5 days closed in 2. Skin looks more even, and I swear I have fewer grays around my temples. My old ankle sprain felt less cranky too. Side effects: slight redness at injection sites and a mild headache the first few pins. No gut issues. Not magic, but I'd buy again.

App shows I've done 142 shots of TB-500, 5 mg each, mostly in my thighs over about five months. I honestly can't point to anything it's fixed. Knees, hands, shoulders? Same as before. Nobody has said I look better or move easier, and nobody has said I look worse. The shot stings like a bee for a few seconds, and both thighs now have a faded permabruise I don't love. I'll keep going anyway, because I'm 52 and not getting any younger. Maybe it's doing something quiet.

34 y/o stay-at-home dad here. Been running TB-500 for about six weeks now, 5mg daily split into two shots—2.5mg morning, 2.5mg evening. My right shoulder tendon pain went from a solid 7/10 to maybe 3/10 by week four. I can pick up my toddler overhead again without wincing. Elbow feels better too, maybe 40% less ache. Side effects were minor: some redness at injection sites and a little tired the first few days. I tried 5mg once daily for a bit but split dosing seemed smoother. Not medical advice, obviously. Higher dose might work better for some, but this has been decent for me.

Tore up my rotator cuff hauling boxes over summer break. Started at 2.5mg twice a day, so 5mg total daily, subq, for six weeks. Yeah, that's on the heavy side compared to what I kept seeing, and obviously not medical advice, just what worked for me. Around week three the nagging ache went from a 7 to a 3. By week six I could lift my arm overhead without that catching pain. Physio was impressed with how quick the range came back. Some redness at shot sites early on, and I slept poorly the first week. Pricey, but I'd do it again for a tendon thing.

55-year-old accountant with chronic elbow tendinopathy. I'm in week 6 of a KLOW stack: 0.25 mg BPC/TB-500/KPV plus 1.25 mg GHK-CU injected twice daily near the elbow. Total daily: 0.5 mg BPC/TB-500/KPV and 2.5 mg GHK-CU. Results are underwhelming. Pain went from maybe 6/10 to 4/10, but I still can't do full pushups or long mouse sessions without aching. Minor injection-site redness only. I plan to finish 8 weeks, pause 4, then consider another 8. For the cost, I expected more.

I’m a 45-year-old retired mechanic, so my shoulders, elbows, and knees have taken a beating. I ran TB-500 at 2 mg subQ every other day for 6 weeks, then once weekly for 2 more. First two weeks I didn’t notice much except some redness at injection sites. By week 3 my right shoulder pain dropped from about 7/10 to 4/10. By week 6 it was around 2/10, and I could reach overhead without wincing. A deep scrape on my forearm also healed in about 5 days instead of the usual 10. Knee swelling after yard work went down faster too. No stomach issues or flu-like feelings, just occasional mild lightheadedness after pinning. I’ll take a break now, but I’m happy with it.

Started TB-500 at 2.5 mg subQ twice weekly for 4 weeks, then 2.5 mg once weekly for 6 more. My left shoulder tendinopathy dropped from 6/10 daily pain to about 2/10 by week 6, and I could reach overhead again. A small kitchen burn also closed up a bit faster. Slight bruising at injection sites and tired for the first week. Gut felt unchanged. Thinking of trying 5 mg weekly for a second 8-week run, since a doctor I follow says he stretched it to 3 months, but his constant sales pitch makes me want to stop watching. I'm 52 and back in grad school, so the extra mobility is worth it, not magic.

I’ve done 142 injections of TB-500 at 5 mg, about every other day for 10 months. As a personal trainer I track recovery, sleep, and lifting numbers. Honestly nothing jumped out: no PRs, no comments from clients, my knees feel the same. The only clear change is the sharp bee-sting burn in my thigh plus bruises on both legs that hang around. I haven’t had any gut or wound issues, so maybe those are fine. I’ll keep using it because I’m 34 and not getting younger, but I can’t call it a game changer.

41-year-old realtor here. I ran TB-500 at 2.5 mg twice a week for 8 weeks, then 2 mg weekly for 3 more. I had a nagging rotator cuff issue from golf and carrying signs. Around week 4, pain went from 6-7/10 to about 3/10, and I could reach overhead without wincing. Small cuts and shaving nicks seemed to close quicker too, maybe a day faster. Inflammation after long open houses was way less. No major side effects, just a little tired after pins for the first week. Not magic, gradual, but I feel more refreshed and move easier. I'll cycle off soon.

55-year-old realtor here. I run TB-500 at 2 mg twice a week for 8 weeks, then take 3 weeks off. Just started my 5th cycle because I hit a plateau around week 8. The changes are gradual, not dramatic. Fine lines around my eyes look maybe 20% softer, and skin on my hands feels thicker. My nagging right elbow pain went from a 6/10 to about a 3/10. Only side effect is occasional redness at the pin site and a mild headache the first few days. No gut changes. I'll keep going.

34 y/o paramedic with chronic lateral elbow tendinopathy. I’m 6 weeks into a BPC/TB-500/KPV blend plus GHK-Cu, injected twice daily near the elbow. Daily totals: 0.5 mg of the BPC/TB-500/KPV mix and 2.5 mg GHK-Cu. So far it’s underwhelming. Pain went from maybe 7/10 on shifts to 5/10, but gripping and stair chairs still flare it. No injection site issues, just mild redness once. I’m planning 8 weeks on, 4 off, then another 8. Maybe tendon repair just takes longer. Not a miracle, but I’ll finish the run.

50-year-old retired mechanic here. Had a bad right shoulder and left tennis elbow. I used TB-500 subq for 8 weeks. First 6 weeks at 3 mg daily, then bumped to 5 mg daily for the last 2 weeks. I also did rehab: dead hangs, bands, and 25 lb dumbbells for high reps. Right shoulder pain went from daily 7/10 to maybe 1/10. Hand numbness stopped. Tennis elbow is gone. Only issue was some redness at injection spots. Cycling off now and hoping it holds. Not magic, do the rehab too.

Ran TB-500 for 12 weeks, 2.5 mg twice a week subq. My nagging shoulder tendon pain dropped from 7/10 to 3/10 by week 8, and I could actually do overhead sales conference setup without wincing. Recovery after long trade-show days felt quicker, maybe 30% less sore. Mild headache and red injection spots first week, nothing after. Gut felt same, so I wouldn't count on it for that. Dr. Jones keeps pushing bigger doses and a second 3-month run, which is tempting but his nonstop sales pitch is exhausting. I might bump to 5 mg weekly next time, but only after a break.

45-year-old teacher here. I ran TB-500 for 6 weeks for a cranky rotator cuff and knee tendonitis. Did 5mg daily, split into 2.5mg morning and 2.5mg night, subq in belly. Around week 3 my shoulder pain went from 7/10 to about 3/10, and I could write on the board without wincing. Knee felt maybe 40% better. Minor side effects: a few red lumps at injection sites and I was sleepy the first week. Some people might need more, but this is not medical advice. It’s pricey, though. Even a paper cut on my thumb closed up quicker than usual.

I’m 28 and in sales, so lots of driving and laptop bag carrying. Started TB-500 at 2.5 mg twice a week for 4 weeks, then 2.5 mg weekly for another 6 weeks. Around week 3 my right shoulder ache went from maybe 7/10 to 3/10, and a paper cut healed in 3 days instead of my usual 6. Gym soreness dropped by about a day. No dramatic overnight change. Only side effect was a little redness at injection sites and a mild headache the first few days. I’m going to take a break now, but I’d likely run it again.

I'm 52 and work as a paramedic, so my shoulders and arms take a beating. Did TB-500 for 8 weeks, subq only. First 6 weeks at 3mg daily, then bumped to 5mg daily for the last 2 weeks. I also did bands, dead hangs, and high-rep dumbbell work capped at 25lb. Right shoulder pain is basically gone, and my hand stopped going numb. Left tennis elbow cleared up too. Only issue was some injection-site redness and feeling a little tired early on. I'm cycling off now, hoping it holds. Adding rehab work made a big difference.

I'm 28, ex-mechanic, not cycling. Ran TB-500 at 2.5mg twice a week for 6 weeks, then 2.5mg once a week for 2 more. My cracked heels are way better, like 80% smoother. I had a few grey hairs, weirdly less now maybe 5-6 gone. Skin tone looks more even and fresher. A deep cut on my knuckle closed in about 3 days instead of a week. No real sides besides a bit tired after pins and one mild headache. Injection sites got slightly red once or twice. Not cheap, but I'd buy again.

55 y/o desk guy here. I run TB-500 at 2.5 mg subQ twice a week for 8 weeks, then take 3 weeks off. I started because of a cranky right elbow and old skin issues. Now on my fifth cycle. Around week 5 I notice a plateau, but after each break things keep creeping forward. Elbow pain went from 6/10 to about 2/10. Forearm crepey skin looks maybe 30% smoother, and small scratches close faster. Mild redness at pin sites and a slight headache first week, nothing else. Recovery after lifting is quicker. I'll keep cycling.

47, barber, on my feet 9 hrs a day. Not cycling or lifting. Ran TB-500 at 2.5 mg subQ twice a week for 6 weeks. By week 3 my cracked heels were way smoother - two deep fissures closed to almost nothing. Cut my thumb with clippers week 4; usually 7 days to close, this was 3. Skin looks more even and fresh. Greys at my temples? Honestly a bit less noticeable. Achy Achilles felt looser. Side effects: mild red bump at injection sites for a day, a little tired after pins. No gut changes. I'd buy again, though price stings.

45-year-old retired mechanic here. I ran TB-500 for 12 weeks: 2 mg subQ twice a week for the first month, then 2 mg once a week. My right shoulder and elbow from years of wrenching were the main target. Around week 3, reaching overhead got easier. By week 8 I could do two hours of yard work without icing my shoulder after. Grip soreness dropped maybe 60%. Small cuts on my hands also seemed to close faster. Only side effect was an occasional red bump at the injection site. Didn't notice any gut changes. Took a 10-day break now; still feeling decent. Gradual, not magic, but I'm happy.

47 y/o PT here. I've done five rounds now: 8 weeks on, 3 off, because I hit a plateau right around week 8. Dose is 2.5 mg subQ twice weekly for 4 weeks, then 2.5 mg once weekly for the last 4. My left elbow tendinopathy pain went from about 6/10 with gripping to 2/10 by week 6. Recovery after lifting is maybe 30% faster. Skin on my arms looks a bit smoother and an old scar is less tight, just keeps building each cycle. Side effects: mild redness at pin sites and one tired day. No gut changes I can tell. I'll keep using it.

I'm 34 and work as a mechanic, so my hands/knees/shoulders get beat up. Played sports for years and had chronic joint pain. Ran TB-500 for 8 weeks. Not gonna lie, the inflammation went down a lot, and my range of motion improved big time. No side effects at all that I could tell. The cardiac repair potential is a nice bonus imo. Still ache sometimes after a long day but way better than before. Def worth trying if you're beat up like me.

Tbh I'm 38 and drive for work, so I don't have time to chase paperwork. I ordered tb-500 for lab reference material, first time with this one. It showed up in a few days and the batch COA was in the box. I had some questions about the docs and the rep got back quick, even told me which outside lab ran the analysis. Not gonna lie, that part was solid. I'm only writing about the documentation and service side. No results, no amount, no personal use stuff. Imo that's all I can say here, and nothing here is me recommending anyone use it.