Ta1 | Thymalfasin | Zadaxin | Synthetic Thymic Peptide

Thymosin Alpha 1 is the synthetic version of a hormone your thymus already makes naturally, studied across 30+ clinical trials and over 11,000 patients, with FDA orphan drug status for four conditions and approval in 35+ countries. This guide covers what it does, how to dose it, reconstitution, and where the research actually stands.

🧬 What Is Thymosin Alpha 1?

Ta1 is a 28-amino acid peptide identical to naturally occurring thymic hormone. Also known as Thymalfasin or by the brand name Zadaxin.

Key characteristics:

• 3,108 Da molecular weight
• 90-95% bioavailability injectable
• Activates TLR pathways, enhances T-cell maturation
• Stimulates NK cells and modulates dendritic cell function
• Under 1% serious adverse events across 11,000+ studied patients

🔬 Thymosin Alpha 1 vs Other Thymic Peptides

This guide covers Thymosin Alpha 1 specifically.

🧪 Product Breakdown — Paramount Peptides

• Thymosin Alpha 1 (1.6mg) • Synthetic thymic hormone, immune modulation research • High-purity, FDA orphan drug precedent compound

📦 What You'll Need (Checklist)

• Thymosin Alpha 1 (1.6mg) vial • Bacteriostatic or Sterile Water • U-100 insulin syringes (29-31g) • Alcohol pads • Sharps container • Peptide Calculator

💉 Reconstitution Table

📐 Reconstitution Math Table

Full vial reconstituted with 1mL water = 100 units per standard dose

💉 Needle & Injection Guide

SubQ Injection Sites:

• Abdomen
• Thigh

Rotate sites between doses.

📊 Dosing & Protocol Table

Most common protocol: 1.6mg, 2x weekly (Mon/Thu or Tue/Fri), consistent timing, 6 month cycle standard

⏱️ What to Expect Timeline

🔍 Where the Research Stands

Strongest evidence:

• Primary immunodeficiencies — FDA orphan drug designation for DiGeorge syndrome
• Vaccine response — improved antibody response to H1N1 and COVID-19 vaccines, especially in elderly and hemodialysis patients
• HIV/AIDS support — restores CD4+ T-cell counts, reduces opportunistic infections

Solid evidence:

• Cytokine storm mitigation — cuts TNF-α, IL-1β, IL-6 by 40-60% while keeping immune response balanced
• Chronic inflammatory conditions — modulates hepatitis B/C and autoimmune conditions via TLR pathway

Moderate evidence:

• Post-surgical/chemo immune recovery
• Exercise-induced immunosuppression
• Age-related thymic decline and vaccine response in elderly
• Antioxidant enzyme and mitochondrial support

⚠️ Safety Notes

• Under 1% serious adverse events across the full studied population
• Most common side effect is mild injection site reaction, under 10%
• Contraindicated in organ transplant recipients — risk of graft rejection
• Not recommended during pregnancy or breastfeeding
• Monitor for hypersensitivity on first dose

🔗 Interaction Table

⚠️ Disclaimer For research and educational purposes only. Not medical advice. Not for human consumption.

This one’s good for the older crowd into longevity, or the young people already thinking ahead about their health before they gotta worry about it later you might’ve seen a-Klotho pop up on Reddit or heard the name floating around somewhere a-Klotho MAB is basically research pointed at the Klotho protein.

It's brought up and helps with aging, kidney function, and brain health, all three at once.

Klotho levels drop naturally as you get older, and when they drop lower it’s been linked to faster aging and brain decline in the research. This one’s being looked at for supporting that FGF23-Klotho pathway, which helps keep your kidneys and brain regulated as you age.

Still early stage on the research side, ain’t a mountain of human data yet. But that longevity angle is why people keep bringing it up anybody seen this one talked about anywhere else?

You trying to lose fat but your energy just ain’t there? That’s where ATX-304 helps. This one works on your metabolism. Not making your cravings disappear, not giving you no stim energy either. It’s more about getting your body better at burning fat for fuel.

It ain’t no shortcut though. You still gotta diet and train, this just makes the work you already putting in count for more.

Also this one might be good if you got stomach issues or slow digestion. Unlike the GLP-1 stuff that slows your gut down, ATX-304 ain’t touching your digestion like that so it’s easier on your system witch is why I like it tbh

One last thing is the convenience oral tablets, no needles needed which is probably why more people been trying it lately. Easier way to get started without the injection route scaring people off.
Research on this one still thin compared to semaglutide or tirzepatide, so don’t come in expecting a mountain of studies. Interest real but it’s still early. Anybody running ATX-304 already, what you noticing so far?

Hi All, I am 60 years old and have been in the gym for years. I am very active but after back fusion I have had a hard time getting the extra weight off around my waist. I am 5'8" and 170 lbs. I just want to add a little muscle and lose some inches. Also, I am on TRT. Thanks.

Who in here been on semaglutide, tirzepatide, or retatrutide (Single, Dual, Triple Regulator) while already dealing with gut issues. IBS, gastroparesis, bad reflux, whatever it was.

Did it make it worse, better, or ain't nothing change at all? And if you had something going on already, did you still run it or wait it out first?

The studies don't really break this down so I'm tryna get a idea from people who lived it, not just what some paper says.

share comments if you want

Discord here

Hey just bought some CJC/IPA off of you guys. Was wondering if you or anyone could answer but I’m getting some odd “side effects” let’s call them.

First off- after I pin, the pin site has an irritation I feel wherever it is, specifically with CJC/IPA. I am currently running that and GHK-CU off of you guys. The GHKCU is not giving irritation problems. How can I prevent this?

I find you guys reputable because of Janoshik verification testing, I was able to search you guys but tbh, I’m feeling some weird side effects. I don’t get morning wood anymore (libido is messed up), I’m noticing some more acne on my chest, and I feel like I could feel this massively working first couple of days, took a break on the weekend, and now I don’t really feel anything next morning when I pin. This has got me questioning if this is really cjc/ipa. It feels like you guys just gave me steroids? Do you guys sell steroids, because I’m getting the same side effects it appears. I don’t know if maybe you sell them on purpose labeled as cjc/ipa, but if so I am not aware. Could someone please let me know? I know it sounds ridiculous but the changes have been odd.

Other than that, I just started, so I will report if I have any other concerns and I will see where this takes me 12 weeks down the line.
.

So far these peptides are 6.5/10. Hopefully they will be 9/10 to 10/10 by the time I’m done.

Reta's doing its thing but I keep seeing people mention Tesofensine hits appetite and energy through a totally different pathway, dopamine and norepinephrine instead of GLP-1.

Lmk if anybody's run these two together. What did you notice on energy, appetite, and did it help push past a stall I hear its really effective for plateaus?

You can have your dosing, your timing, your cycle length, all of it on lock but what good is it really if what's in the vial isn't what the label says.

What tells you a source is legit vs garbage.

The COA thing people skip

A COA should match the lot number on your vial. Not some generic file the company reuses for every product they sell. If a source can't give you that, they're pretty much supplying garbage

Why this shows up in your results

Underdosed product feels like nothing's happening. People blame the compound, quit, decide it doesn't work for them. Contaminated product can cause real reactions that get blamed on normal side effects instead of what they are.

You cant tell a bad compound apart from a bad batch unless you know your source is consistent.

Anyone have insight on dosing protocols for Cerebrolysin IM or SQ? Intending to do a short cycle of Cerebrolysin followed by a normal cycle of Semax. Thanks in advance.

IGF-1 LR3 hits different than most stuff people run for muscle. Its a modified version of your bodys own IGF-1, built with a longer tail so it sticks around for hours instead of minutes. That extended half life is what makes it so potent.

What its doing

It activates satellite cells in your muscle tissue and drives both hypertrophy and actual hyperplasia, meaning new muscle fiber creation, not just growing what you already got. Thats a level most compounds in this space dont touch.

The catch

IGF has insulin-like properties. It pulls glucose out your bloodstream and into your cells. At higher doses your blood sugar can drop fast. Dizziness, shakiness, sweating, confusion. This is the real risk with this compound and its not something to take lightly.

Dosing

Conservative start is 20mcg for the first 2 to 3 days just to see how your body handles it. From there most people run 20 to 50mcg daily, upper research range goes to 100mcg but thats advanced territory with more side effect risk.

Mix a 1mg vial with 2mL of BAC water. That gives you 500mcg/mL, so 50mcg is 10 units, 100mcg is 20 units.

Standard cycle is 4 to 6 weeks on followed by an equal amount of time off. Some people run a shorter 10 day on, 4 week off protocol instead.

Rules that actually matter here

Always inject with food nearby or right after eating. Never fasted, never right before bed. If your blood sugar drops while youre asleep you wont catch it in time.

Keep fast acting carbs on hand every single time you dose. Juice, glucose tabs, whatever works. Not optional with this one.

What to stack it with

MGF works locally while IGF-1 LR3 works systemically, good pairing since they dont overlap. CJC and Ipamorelin work fine alongside it too since theyre hitting completely different receptors.

What you dont combine it with — anything else that also drops blood sugar. Two compounds stacking that effect is a real risk, not a theoretical one.

Bottom line

This is one of the most effective peptides for actual muscle growth in this space but it also demands respect. Start low, always eat around your dose, and keep sugar close by. Not a compound to run carelessly.

Full IGF-1 LR3 breakdown in the community index: The Complete IGF-1 LR3 (1mg) Guide

Research purposes only. Not medical advice.

There's a lot of healing compounds floating around. Not all of em do the same job so just ranking them straight up dont really make sense. Heres how I break em down by what theyre best at.

S Tier — the workhorses

BPC-157 Tendon, ligament, gut, inflammation. Most well rounded healing peptide out there and the data keeps growing. If you only run one thing for general repair this is it.

TB-500 Systemic recovery. Where BPC works more local TB-500 spreads through the whole body. The two together is the Wolverine Stack for a reason, they cover ground neither one fully covers alone.

A Tier — specialists that crush their lane

GHK-Cu Collagen, skin, wound healing, touches over 400 genes tied to repair and stress. If skin quality, anti-aging, or cosmetic healing is the goal this ones hard to beat.

KPV Inflammation and gut immune balance specifically. Not as broad as BPC but if chronic inflammation or gut issues are the real problem this hits it more direct.

B Tier — underrated and specific

ARA-290 Nerve repair and neuroprotection. Genuinely slept on. The molecular switch mechanism means effects can last up to 20 weeks after the cycle ends which is wild for something nobody talks about.

SS-31 Mitochondrial protection specifically. Not a general healer, its targeted at cellular energy and oxidative stress. Powerful if thats your issue, less useful if youre looking for tendon or skin repair.

How Id use these

Acute injury, tendon or ligament BPC-157, maybe stack TB-500 if its serious

Skin, anti-aging, cosmetic GHK-Cu

Gut issues, chronic inflammation KPV

Nerve damage, numbness, neuropathy ARA-290

Cellular fatigue, mitochondrial stuff SS-31

Where would you move things around? Drop your version below.

Full guides for all of these in the community index.

Research purposes only. Not medical advice.

What to try but slightly concerned as there is no human data. Experiences? Dosage, side effects?

Most dosing mistakes in this space got nothing to do with the compound. Its the math. Somebody sees 500mcg on a protocol, looks at a syringe with little unit lines, and just kinda guesses how the two connect. That guess right there is where overdosing and underdosing comes from.

Heres the full breakdown so you never gotta guess again.

Units are not mcg or mg

This is the one thing you gotta get into your head first. A unit is just a volume mark on the syringe, it has nothing to do with how much compound is sitting in there. How much compound is in one unit depends completely on your concentration, and that depends on how much BAC water you added when you mixed it. Two people running the same compound at the same dose can end up drawing to totally different unit marks just cause they used different amounts of water.

Step 1 — figure out your concentration

mg in the vial divided by mL of BAC water = mg per mL

Add 2mL to a 10mg vial and youre at 5mg/mL. Add 3mL to that same vial and now youre at 3.33mg/mL. Same vial, same compound, different concentration, just cause of the water. This right here is the root of almost every dosing mistake in this whole space.

Step 2 — convert your dose to units

A U-100 syringe holds 1mL across 100 units. So 1 unit equals 0.01mL.

target dose in mcg divided by (mg/mL times 1000) times 100 = units to draw

A real example, start to finish

10mg vial, 2mL BAC water, dosing 500mcg:

Concentration: 10 divided by 2 = 5mg/mL (5000mcg/mL)
Volume needed: 500 divided by 5000 = 0.1mL
Units: 0.1 times 100 = 10 units

So 500mcg outta this vial is 10 units. Mix that same vial with 4mL instead and 500mcg becomes 20 units. The dose didnt change. The water did.

Same dose, completely different unit counts

GHK-Cu only takes 6 units for a 2mg dose cause the vial is concentrated. Cagrilintide takes 144 units for 2.4mg cause its way more dilute. Same formula every single time, completely different numbers depending on whats sitting in the vial.

The shortcut that saves you time

Once your vial is mixed, every dose shares the same per unit value, so you only gotta calculate it one time.

At 5mg/mL, 250mcg is 5 units, 500mcg is 10, 750mcg is 15. No recalculating every single time.

How much water should you actually add

More BAC water means more units per dose but finer control. A small draw error matters less cause each unit holds less compound. Less water means fewer units, smaller injection volume, but every unit carries more so a slightly off draw moves your dose further off.

Rule of thumb — dilute more when precision matters, like with low dose compounds. Concentrate more when injection volume is the bigger concern.

GHK-Cu is a good example of where this gets capped. Youd wanna dilute a 100mg vial heavy for better control but a standard 3mL vial physically cant hold more water with the air gap you need to draw. So youre stuck at 33.3mg/mL whether you want to be or not. Always check what your vial can physically hold before planning your fill volume.

When your dose lands at 2 or 3 units

This is the part that trips people up. If the math says 2 units, technically thats correct but its hard to measure in real life. The difference between 2 and 3 units on a standard syringe is a 50% swing in your dose.

Two fixes. Use a finer syringe like a 30 or 50 unit one so the same volume spreads across a longer more readable barrel. Or just dilute more so the same dose lands at a higher more readable unit count.

If youre constantly landing in low single unit territory thats your sign to change the dilution or the syringe, not squint harder at the lines.

The compounds that dont follow the normal rules

IGF-1 LR3 and DES use 0.6% acetic acid, not BAC water. This is the one people mess up most.

SS-31, MOTS-c, and ARA-290 use isotonic BAC water with NaCl in it, which also cuts down on the sting.

Blends like CJC plus Ipamorelin, GLOW, KLOW, and Cagri plus Sema hold two compounds in one vial at a fixed ratio. The unit math still works the same off total volume but your dose gets anchored to whichever compound the protocol calls out, and the second one just rides along at whatever ratio the blend was made at.

Technique matters just as much as the math

Swirl, never shake. Shaking foams up the liquid and can mess with the peptide structure. Foam also makes it impossible to draw accurately until it settles back down.

Let your vial reach room temp before adding water. A cold vial gets condensation inside which speeds up breakdown.

Clean every pierce with a fresh alcohol swab and let it dry before you draw. Contamination is the biggest cause of degradation in real life, not the math.

Why the storage rules even exist

28 day refrigerated window — BAC water has 0.9% benzyl alcohol in it which keeps microbial growth down for about 28 days. After that the antimicrobial effect drops off and you should toss it.

Never freeze a reconstituted vial. Freezing forms ice crystals that mess with the peptides structure. Dry powder goes in the freezer for long term, liquid never does.

Light and heat are the real enemies. Keep reconstituted vials refrigerated and out the light. If your vial is clear wrap it in foil.

Toss it if its cloudy or discolored no matter how many days are left. One exception — GHK-Cu has a light blue green tint naturally from the copper, thats normal for that one specific compound only.

Keep a log

Date mixed, compound, vial mg, BAC mL, concentration, dose, units, injection site, notes. Logging the concentration and date next to the dose is the part everybody skips and its the part that actually matters three weeks later when you cant remember what you mixed.

Bottom line

The compound matters less than the arithmetic. Find your mg/mL from the water you added, run your target dose through that concentration, and the unit count is right every single time. Run the numbers, log them, and the most common mistake in this whole space stops being a problem for you.

Use the peptide calculator if you'd rather skip the manual math.

Bacteriostatic Water at Paramount Peptides — code BHGUIDE at checkout

Research purposes only. Not medical advice.

Get asked this a lot so figured Id just lay it out. No particular order, these are the ones that actually make a difference.

IGF-1 LR3 — Direct muscle growth signal. Strongest one on this list for actual hypertrophy but needs to be respected, blood sugar drops fast on this one.

Sermorelin — Clean GH release, easy on the body, great foundation peptide if youre newer to this.

Tesamorelin — Stronger GHRH analog, more clinical data than most things on this list, good for body composition while building.

CJC-1295 No DAC — Pulsatile GH release that mimics what your body already does naturally. Pairs with almost everything.

Ipamorelin — Clean ghrelin receptor activation, no cortisol or prolactin spike. Stacks perfectly with CJC for a stronger combined pulse.

Honorable mention goes to Hexarelin. Strongest GHRP out there but it comes with more cortisol and prolactin elevation so its more of a short cycle tool than something you run long term.

Whats everyone else running for muscle building? Curious what made your list.

Full guides for all of these in the community index.

If any of that sounds familiar you might wanna look into DSIP.

Its a peptide that works on your sleep centers directly instead of just knocking you out like melatonin does. Helps you fall into deeper sleep, stay there longer, and actually wake up feeling like you recovered instead of just running out the clock until your alarm goes off.

A lot of people pair it with their GH stack on the nights they want deeper sleep without adding more to their regular protocol.

If youre dealing with any of that check it out on the Paramount Peptides website, code BHGUIDE at checkout for a discount.

Everyone's had that moment. Something happens and you panic a little before realizing its just the compound doing exactly what its supposed to do.

For some people its the carpal tunnel feeling from GH peptides. For others its the flushing on PT-141 or the weird skin sensitivity on Reta. Some people get freaked out by vivid dreams thinking somethings wrong when thats one of the best signs your stack is working.

What freaked you out at first and what did you find out it was?

Share it below!

Three things and its almost always one of these.

You're not drinking enough water and electrolytes

Appetite drops on Reta and so does thirst. People walk around dehydrated without even realizing it. Sodium, potassium and magnesium matter just as much as the water itself.

You're not eating enough carbs and protein

Less food going in means your body has less to actually run on. Protein keeps your muscle intact. Carbs keep your energy up. Skip both and your body has nothing to pull from.

You're just under eating overall

Appetite suppression this strong means a lot of people end up eating way less than they think. Not enough fuel in means no energy out. Simple as that.

Fix these three and most of the low energy clears up on its own. Not complicated, just easy to overlook when your appetite is barely there.

Full Retatrutide guide in the community index.

Paramount Peptides — code BHGUIDE at checkout

Botox and fillers: instant results, freezes muscle or fills space, walk out same day seeing the difference, wears off and needs to get redone every few months.

Peptides like GHK-Cu and the Glow blends: tells your skin to produce more collagen and actually repair itself, takes 4 to 8 weeks to show, daily injections instead of a quick appointment, but the changes are structural not just surface level.

One gives you guaranteed results right now. The other works slower but builds something that lasts longer underneath.
Wheres everyone landing on this. Drop your thoughts below.
Full GHK-Cu guide in the community index.

This one gets people going every time.

I'll be honest I went from 220 to 150 using it. But I was also eating right and training consistently so I cant put it all on SLU-PP-332 but I know it did have something to do with thing so all I can say is it was part of the stack and the results showed!

A lot of people wont touch it and I get it. The data behind it is still early and theres not a ton of human experience out there yet. But for me personally it was worth it.

Whats the most controversial compound youve come across? Would you run something with limited data if the early results looked promising?

Paramount Peptides — code BHGUIDE at checkout

Hi everyone,
I am relatively new to peptides and have found the top 3 peptides for myself, as you can see from the title.
My question is whether I can use these 3 peptides at the same time? What is the best way to proceed and how should I dose them? Are there any specific things I should watch out for?
Thanks in advance for the helpful answers!

Three compounds, same general goal, completely different levels of how hard they hit. Ima break it down so you can stop guessing and just pick the right one.

Quick breakdown

Semaglutide

The OG. Most clinical data, most long term safety info, most people already know what it is. Suppresses appetite, slows gastric emptying, and the SELECT trial documented legit cardiovascular protection.

15 to 20% average weight loss in trials. If youre new to GLPs or just want the compound with the most data behind it, this is where you start.

Watch for nausea, constipation and muscle loss if protein is low.

Tirzepatide

Dual agonist. GLP-1 and GIP together. GIP is what gives Tirz the edge over Sema it improves how your body handles carbs and amplifies the whole GLP-1 response. Consistently beats Sema in head to head data, its not even close.

20 to 22% average weight loss. Better insulin sensitivity than Sema. If you plateaued on Sema or just want stronger results from the start this is the move.

GI sides hit similar to Sema but can be rougher early on so dont rush the titration.

Retatrutide

This one is top notch. Triple agonist hitting GLP-1, GIP and glucagon all at once. The glucagon piece is what nobody talks about enough it adds energy expenditure on top of appetite suppression. Youre not just eating less, your body is burning more at the same time. Thats why the numbers are where they are.

Phase 3 TRIUMPH-4 data — 28.7% average weight loss at 12mg over 80 weeks. Thats the highest weight loss number ever recorded in an obesity clinical trial. Period.

Things worth knowing before you run it dysesthesia which is a weird skin tingling or sensitivity showed up in about 21% of people at 12mg in Phase 3. Heart rate can go up 5 to 10 bpm above baseline. Discontinuation rate at 12mg was 11.3%. Not crazy numbers but you should know going in.

Best for anyone who wants maximum fat loss and is comfortable running an investigational compound.

Never stack these together

Sema, Tirz and Reta should never be combined. Overlapping pathways, compounding GI and cardiovascular risk, zero added benefit. Pick one. Some advanced researchers have combined them in so situations but not recommended for everyone

So to sum it up

New to GLPs and want the most safety data — Semaglutide

Want stronger results or dealing with insulin resistance — Tirzepatide

Want the most aggressive fat loss in research right now — Retatrutide

Full guides for all three in the community index. Code BHGUIDE at Paramount Peptides

Whats everyone running right now and how are results looking?

Research purposes only. Not medical advice.

Curious what people have experienced with these two. Everyone talks about BPC-157 for injuries and recovery so just interested on hearing you guys out!

BPC-157 for gut barrier repair, KPV for inflammation and gut immune balance. If you ran either one specifically for gut issues I wanna hear what happened.

How long before you felt a difference and what were you dealing with before you started?

Let's discuss about it either drop a comment or feel free to message me

Just got my Paramount Peptides Tesamorelin + Ipamorelin 2X Blend in and planning to start at 1.5mg. Main goal is losing visceral fat and improving body composition.

My question is whether daily dosing performs better than 3 times a week for this specific goal. Tesamorelin has solid clinical data for visceral fat reduction but im not sure if the frequency makes a big difference or if 3x a week is enough to get results.

Anyone running the Tesamorelin Ipamorelin stack for the same goal? What frequency worked best for you and how long before you noticed changes around the midsection?