Author
Chris Hallewell
Founder of Underground Biohacking. Returned to Masters Touch Rugby representative selection after two back surgeries by building a structured peptide and recovery stack that actually worked. Writes practical, research-backed guides for men 35+.
Articles by Chris
85 articles on peptide protocols, recovery science, and performance.
DSIP Peptide Dosage: What Human Sleep Studies Used
DSIP peptide dosage in sleep trials was 25 or 30 nmol/kg into a vein, for one to seven nightly doses. FDA's review found no clinical study under the skin.
GHK Cu Topical, How to Use It and What It Does
GHK-Cu topical explained: what it does, the 2 to 4 percent strength to use, and how it stacks up against injectable versions and the anti-ageing hype.
Semax Dosage: Nasal Spray vs Injection in Published Studies
Semax dosage in published studies: the doses and courses two Russian stroke trials used, plus the nasal and injected doses given in rat and mouse research.
BPC-157 Dosage Chart by Weight: What Studies Actually Used
BPC-157 dosage chart by weight, checked against primary sources: the per-kg doses used in rats, dogs and one human enema study, and what the FDA found.
Insulin Syringe Units for Peptide Dosing: mcg to Units Chart
Insulin syringe units for peptide dosing, worked out: what U-100 really means, the mcg to units formula, and a chart for every vial size and water volume.
Peptide Reconstitution Chart: mg/mL by Vial Size and Water
Peptide reconstitution chart: the formula that turns vial milligrams and water millilitres into mcg/mL and U-100 syringe units, plus what drug labels say.
MOTS-c Dosage: What Studies Used and What Is Still Unknown
No MOTS-c dosage has been tested in people. See the doses used in animal studies and the CB4211 trial, what the FDA found, and where MOTS-c stands in sport.
BPC-157 Tendon Repair: What Rat and Human Studies Show
BPC-157 tendon repair, checked against primary sources: rat ligament and tendon studies, the one human knee report, doses as studied, and FDA safety findings.
Peptide Dosing Advice: Why Most Dosage Charts Get It Wrong
Why most peptide dosing advice gets it wrong: a dosage chart, the mixing maths behind a dose, why half-life varies so widely, and why the vial comes first.
Peptide Cycling Protocols: Do You Need to Take Breaks?
Peptide cycling protocols checked against human trials: what hexarelin, CJC-1295 and MK-677 studies found on tolerance, and what the studies did not test.
FDA Peptide Vote 2026: 6 of 7 Backed for the 503A Bulks List
On 23-24 July 2026 the FDA peptide advisory committee backed 6 of 7 peptides for the 503A bulks list. Full vote matrix, and why nothing is legal today.
MOTS-c Peptide: Benefits, Side Effects and the Evidence
MOTS-c is a mitochondrial peptide studied in mice and cells. See what research shows on benefits, exercise, side effects, study doses and its FDA status.
Running Peptide Protocols: What I've Learned
Lessons from running peptide protocols: most dosing is a guess, tolerance is pathway specific, your source drives antibody risk, and the safety data is thin.
KPV BPC-157 Stack for Gut Healing: Protocol and Dosing
The KPV BPC-157 stack for gut repair: what each peptide does, what the research shows, the doses people run, the KLOW version, and where the evidence stops.
KPV for Gut Health: IBD, Inflammation, Oral vs Injectable
KPV for gut health, checked against primary sources: what cell and mouse studies show, why no human dose exists, and where the FDA's 2026 review stands.
Peptides for Weight Loss: What the Evidence Shows
Peptides for weight loss, ranked by the evidence each one has: GLP-1 drugs and tirzepatide have real human trials, the rest are animal data or a failure.
Retatrutide vs Tirzepatide vs Semaglutide: The Evidence
Retatrutide vs tirzepatide vs semaglutide compared on receptors, trial weight loss, liver fat, side effects and FDA approval status, with every figure sourced.
Retatrutide Side Effects: What Phase 2 and 3 Trials Show
Retatrutide side effects in Phase 2 and Phase 3 trials: nausea and other gut symptoms, dysesthesia, heart rate, serious events and who the trials left out.
The Case for Peptide Regulation: An Unpopular Opinion
The case for peptide regulation in plain terms: 34 FDA-approved peptides since 2016, about 30% of gray-market vials failing checks, and what it means for you.
BPC-157 Prescription in 2026: Why No Pharmacy May Fill One
BPC-157 prescription in 2026: no US pharmacy may lawfully compound BPC-157 or TB-500, and July's FDA advisory vote did not change that. What the record shows.
Retatrutide Dosage and Titration: What the Trials Used
Retatrutide dosage in clinical trials: Phase 2 doses of 1 to 12 mg weekly, 2 mg or 4 mg starts, Phase 3 TRIUMPH doses, half-life and weight loss by dose.
Are Peptides Legal in 2026? The Honest FDA Answer
Are peptides legal in 2026? None of these eight is FDA-approved, and seven have no lawful route to a pharmacy today. The full FDA record, peptide by peptide.
Retatrutide Peptide Explained: How the Triple Agonist Works
Retatrutide peptide is a GLP-1, GIP and glucagon triple agonist. How each receptor works, what the Phase 3 trial data shows, and how it compares to tirzepatide.
Tesamorelin: Benefits, Side Effects, Evidence and Safety
Tesamorelin explained in plain English: what it does, the real trial evidence, benefits, side effects, contraindications, legal status and safe sourcing.
BPC-157 Complete Guide: Research, Safety and Legal Status
BPC 157 guide: what the peptide is, what rodent (rat) studies show, the doses studies used, side effects, and FDA and WADA status. Human data is thin.
How to Inject Peptides: Subcutaneous Technique and Sites
How to inject peptides subcutaneously: the syringe unit maths, where to inject, needle angle, site rotation, pain reduction, and safe sharps disposal.
How AI Is Changing Peptide Research, and What It Means
AI changing peptide research is not hype: discovery has gone from years to weeks. Here is what the peer-reviewed evidence shows, and where it still falls short.
KPV Peptide Complete Guide: Mechanism, Benefits and Dosing
KPV peptide is the alpha-MSH tail fragment that blocks NF-kB, lowers IL-1, IL-6 and TNF-alpha, and enters gut cells on PepT1. The mechanism in plain words.
AOD 9604 Dosage: Trial Doses, Timing and Cycling Evidence
AOD 9604 dosage explained: every dose tested in human trials and what each trial found. Why development stopped in 2007, and why no dose is established today.
Best Nootropic Peptides for Focus and Memory: Ranked
The best nootropic peptides for focus and memory, graded: Semax, Noopept, Selank and MOTS-c, what the primary research really shows, and who each one fits.
HGH Secretagogue vs HGH: How Each Works, Safety and US Law
HGH secretagogue vs HGH: how each works, what the trials show on safety, where each stands in US law, and who each was tested in. A plain guide for men 35+.
AOD-9604 Dosage for Fat Loss: What the Trials Show
AOD-9604 dosage for fat loss, read from the trials: 1 mg a day did best over 12 weeks, 10 mg did worse, and a 536-subject trial failed. What the papers show.
AOD 9604 Peptide: Fat Metabolism, Evidence, Legality
AOD 9604 peptide guide: how it works, what the Phase IIb trial actually found, the visceral fat data, side effects, legal status and where it stands in 2026.
What Are Peptides? A Beginner's Guide to How They Work
What are peptides? Short chains of amino acids that act as signals by binding receptors. The biology, the four categories, FDA status and safety basics.
The Peptide Purity Crisis Nobody Talks About
The peptide purity crisis is real: most COAs report HPLC purity only. Here is what endotoxin, TFA and synthesis byproduct testing reveal, and what to check.
Tesamorelin Dosage: Label Doses, Timing and Trial Results
Tesamorelin dosage from the FDA labels: 2 mg, 1.4 mg or 1.28 mg once daily. How each vial is mixed, what the trials found, and what is not established.
Tesamorelin vs Sermorelin: Cost, Dosing and Fat Loss
Tesamorelin vs sermorelin compared on mechanism, visceral fat evidence, dosing, monthly cost and side effects, plus a clear goal-based pick for men 35-plus.
Tesamorelin Ipamorelin Blend: Which One Fits Your Goal
Tesamorelin ipamorelin blend explained: how each peptide works, what the visceral fat data shows, how each is dosed, what each costs and which fits you.
Reliable Peptide Sources: How We Choose Who Makes the List
None of the peptides the FDA voted on in July 2026 can be lawfully compounded today. What the vote means for reliable peptide sources, WADA bans and testing.
Thymosin Alpha 1 Dosage for Autoimmune Disease: Evidence
Thymosin alpha 1 dosage for autoimmune disease: no trial has set one. The doses the trials really used, the serum deficiency data, and the safety record.
Thymosin Alpha 1 Dosage: Chart, Timing and Mixing
In trials, the standard thymosin alpha 1 dosage was 1.6 mg under the skin twice weekly. See the trial chart, the sepsis regimen and how a trial vial was mixed.
Peptides for Gut Health: The 5 Best for Inflammation
The best peptides for gut health and inflammation are BPC-157, TB-500, GHK-Cu, KPV and MOTS-c. Here is how each one works, and what the research really shows.
Peptide Testing Labs: How to Test Your Peptides for Purity
Peptide testing labs: what HPLC and mass spectrometry show, how ISO/IEC 17025 accreditation is checked, and why a purity result is not FDA or WADA status.
How to Know If Your Peptides Are Real: A Checklist
How to know if your peptides are real: the five checks that catch a fake vial, from the certificate of analysis to independent HPLC and mass-spec testing.
How to Buy Peptides Safely: Vet a Supplier, Spot a Scam
How to buy peptides safely: what a batch certificate of analysis shows, the warning signs the FDA lists for online sellers, and what each lab test measures.
How Are Peptides Made? Lab Synthesis to Finished Vial
How are peptides made? Solid-phase synthesis step by step, why most of them come from China, and the lab tests that prove a vial is what the label claims.
How to Read a Peptide COA (Certificate of Analysis)
How to read a peptide COA properly: check the issuing lab is real, match the lot code on your vial, then read the purity and identity results yourself.
Ipamorelin vs MK 677: Which One Fits Your Goal
Ipamorelin vs MK 677 compared: GH pulse pattern, the blood sugar cost, dosing, side effects, and which of the two GH secretagogues really fits your goal.
GHK-Cu Wound Healing: What Research Shows and Hasn't Tested
GHK-Cu wound healing facts: lab and animal studies, the one leg ulcer trial that found no benefit, no human study of injected GHK-Cu, and FDA's 2026 status.
Grey Market Peptides: Purity, Endotoxins and the Law
Grey market peptides explained: why the seven peptides FDA's advisers voted on have no lawful compounding route today, plus purity gaps and endotoxin risk.
GHK-Cu Peptide Benefits for Skin and Hair: Evidence
GHK-Cu peptide benefits for skin and hair: what the collagen and firmness studies show, which serum strengths studies used, and where the hair evidence is thin.
Ipamorelin Dosage: mcg Amounts, Timing and Cycle Length
Ipamorelin dosage in plain numbers: mcg per shot, when to inject, how long a cycle runs, and the reconstitution math to do before your first injection.
Stacking Peptides: When a Stack Beats One Peptide
Stacking peptides only beats one compound under two conditions. Five stacks graded honestly on the evidence, with doses, and when one peptide wins instead.
Ipamorelin Complete Guide: The Cleanest GH Secretagogue
Ipamorelin complete guide: how this clean GH secretagogue works, what the research really shows, dosing from published protocols, side effects and the law.
CJC-1295 Side Effects and Safety: What Trials Found
CJC-1295 side effects from human trials: injection-site reactions, headache and flushing, plus what FDA flags on blood sugar, cancer risk and unstudied forms.
Is CJC-1295 Ipamorelin FDA Approved? The 2026 Legal Status
Is CJC-1295 ipamorelin FDA approved? Neither peptide is, pharmacies have no lawful route to compound them, and FDA's advisers voted against both in 2024.
CJC-1295 Dosage: What the Studies Show for DAC and No-DAC
CJC-1295 dosage: no dose is established. See the doses healthy adults got in the three DAC studies FDA found, and why the no-DAC form has no human data.
Peptides for Knee Cartilage Repair: What the Evidence Shows
Peptides for knee cartilage repair: what the one human case series found, the doses sites report, and the honest limits of the evidence on BPC-157 and TB-500.
BPC-157 Herniated Disc: What the Evidence Really Shows
BPC-157 herniated disc claims, checked against primary sources: rat spinal cord and nerve studies, the disc's lack of blood supply, and what human data exists.
CJC-1295 Ipamorelin Stack: How It Works, Doses and Safety
CJC-1295 ipamorelin explained: how the two receptors work, the doses studies used, DAC vs no-DAC, and the human safety record. No human trial tested the pair.
Peptides for Loss of Smell: What the Evidence Shows
Peptides for loss of smell rest on real biology and zero human trials. Here is what the evidence supports, and why no clinical trial has ever been run.
Wolverine Stack for Torn Meniscus: The Real Evidence
The wolverine stack for torn meniscus is BPC-157 and TB-500. What the rat studies show, what the one small human knee series showed, and what neither proves.
6 Best Peptides for Anti-Ageing and Longevity (2026)
The best peptides for anti-ageing and longevity, graded by human evidence: thymosin alpha-1 has the most, while epitalon and MOTS-c have little or none.
CJC-1295 Complete Guide: Mechanism, Trial Doses and Safety
CJC-1295 raised GH 2- to 10-fold in healthy adults, but the 6-to-14-day window is oversold. The honest read on mechanism, DAC vs no-DAC, trial doses and safety.
BPC-157 and TB-500 Post-Surgery Recovery: What Is Known
BPC-157 and TB-500 post surgery recovery: what rodent (rat) and cell studies show, why no human trial sets a start time or dose, the risks and FDA's record.
FDA Compounding Regulations Peptides Users Must Know
FDA compounding regulations peptides users face in 2026: what the July advisory vote and Category 2 removal mean for 503A pharmacies. No peptide is listed yet.
Thymosin Alpha 1 Peptide: Benefits, Dosage and Safety
Thymosin alpha 1 peptide explained: how it works, what the trials found, the doses they used, its side effects, and where it stands with the FDA in 2026.
Best Peptides for Injury Recovery: What the Evidence Shows
Best peptides for injury recovery, weighed on the evidence: what BPC-157, TB-500, GHK-Cu and four others were studied in, plus FDA's legal record in 2026.
GHK-Cu Peptide Guide: Skin, Dosage, Injection, Side Effects
GHK-Cu peptide guide: what skin trials found, what studies used, the lack of human injection trials, FDA's 2026 status and the side effects reported so far.
TB-500 Hair Growth: What the Evidence Really Shows
TB-500 hair growth evidence is rodent-only: three animal studies, no human trial, plus the doses people report and what the research still cannot show.
Selank Complete Guide: What the Anxiety Research Shows
Selank checked against primary sources: the Russian anxiety trials, animal doses per kg, the Semax and phenazepam studies, side effects and withdrawal.
Semax vs Selank: What the Research Shows on Each Peptide
Semax vs Selank checked against primary sources: how each acts in animal studies, the Selank anxiety trials, FDA's 2026 Semax review and what is still unknown.
TB-500 Dosage: What Research Has and Hasn't Tested
TB 500 dosage facts: no published study has tested a dose in people. See the animal doses FDA reports, the thymosin beta-4 trial doses and tendon data.
BPC-157 and Testosterone Cypionate: What Studies Show
BPC-157 and testosterone cypionate, checked against primary sources: no study has tested the pair, what TRT tendon tear studies found, and BPC-157 safety gaps.
TB-500 Side Effects and Safety: What the Research Shows
TB-500 side effects: FDA's TB-500 review found no human studies and two reports on a TB-500 and BPC-157 blend. What the record shows on immune risk and cancer.
BPC-157 Dosage: What Human and Animal Studies Actually Used
BPC-157 dosage, checked against primary sources: the doses used in human reports and planned in a Phase I trial, animal doses per kg, and FDA and WADA status.
BPC-157 Gut Health: What Rat and Human Studies Show
BPC-157 gut health, checked against primary sources: mostly rat studies, two small enema studies in people, and the FDA's 2026 finding on ulcerative colitis.
BPC-157 Banned by WADA: What Athletes Need to Know
BPC-157 banned: WADA lists the compound under S0 on the 2026 Prohibited List. Who the ban reaches, how USADA enforces it, detection, TUEs and non-tested use.
BPC-157 Oral vs Injectable: What the Evidence Shows
BPC-157 oral vs injectable, checked against primary sources: no human study compares them, FDA found no human absorption data, and what rat studies show.
BPC-157 vs TB-500 Comparison: What the Research Shows
BPC-157 vs TB-500 comparison: what each healing peptide does, what the rat, lab-dish and eye studies found, and why neither has a human injury trial yet.
Best Peptides for Men Over 40: Recovery and Longevity
The best peptides for men over 40: what BPC-157, TB-500, CJC-1295, ipamorelin, Semax and GHK-Cu each do, the reported doses, and how strong the evidence is.
How to Reconstitute Peptides: Diluents, Maths and Storage
How to reconstitute peptides, from primary sources: the diluents an FDA label names, the concentration maths, what damages a peptide, and storage figures.
TB-500 Complete Guide: What the Research Shows in 2026
TB 500 guide: what the peptide is and what lab and animal work shows. Plus the human data on its parent protein, side effects, and FDA and WADA rules in 2026.
BPC-157 and TB-500: What the Wolverine Stack Research Shows
BPC-157 and TB-500 (Wolverine stack): no study tested the pair. See the doses the FDA reports from human studies, what was tried together and the safety record.
Semax Complete Guide: Neuropeptide for Focus and Memory
Semax complete guide: how this Russian peptide raises BDNF in animal and stroke studies, what the human evidence shows, plus side effects and sourcing.