Modified GRF (1-29)
Mod GRF 1-29, ModGRF, Mod GRF, CJC-1295 without DAC, CJC-1295 no DAC, CJC no DAC, Tetrasubstituted GRF (1-29), Mod GHRH 1-29
Forms: Same peptide as CJC-1295 but without the albumin-binding DAC group, so it acts briefly; CJC-1295 with DAC is listed separately.
Synthetic GHRH (1-29) analogue with four amino-acid swaps that resist breakdown; triggers a brief GH pulse. No published human studies.
Legal status: Never developed as a medicine; sold only as a 'research peptide'. Status varies by country.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Never developed as a medicine. In sport: a 'research peptide' used to amplify natural GH pulses for fat loss, recovery and sleep — claims extrapolated from related peptides.
What people seek and what studies show
Sought for bigger natural GH pulses aimed at fat loss, recovery and sleep. No human studies of this exact peptide have been published; the idea is borrowed from unmodified GHRH (1-29), which gives a brief GH pulse. Combining secretagogues raises GH exposure and its side effects (swelling, numb hands, higher blood sugar). Effects on body fat, muscle, recovery or sleep have never been tested.
Effects
Evidence: Anecdotal — no real studies
Sought effects by goal (as reported)
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
8 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 4 of 8 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. For the rest — general advice. No measure removes a risk completely.
Products obtained without a prescription are often fake, mislabeled or non-sterile, and there is no way to check at home. For legal supplements, look for third-party testing (Informed Sport, NSF).
What is unknown cannot be lowered, only avoided; tell your doctor what you have taken.
No check-up or blood test lowers this risk; avoid with any personal or family history of cancer.
Low-level side effects
How each option helps (1)
- Working with a doctor — Tells harmless water retention from swelling due to heart, kidney or liver trouble; steroid labels warn that edema can come with heart failure.
How each option helps (1)
- Heart screening: ECG and echocardiogram — An ECG reveals arrhythmias, conduction problems and QT changes — important with stimulants, clenbuterol, thyroid hormone or diuretics.
How each option helps (1)
- Working with a doctor — Finds treatable causes of numbness early: low vitamin B12 on metformin, copper deficiency from excess zinc, nerve compression from GH-driven swelling.
How each option helps (7)
- Glucose monitoring — Rising fasting readings reveal insulin resistance from GH or other drugs early.
- Regular blood tests — Fasting glucose, insulin and HbA1c catch rising blood sugar early — key with GH, its secretagogues and insulin.
- Regular cardio training — Improves insulin sensitivity — useful against the blood-sugar rise from GH and its secretagogues.
- Working with a doctor — Interprets glucose markers and treats early metabolic problems.
- Berberine — Meta-analyses: lower fasting glucose and HbA1c (about 0.6% in type 2 diabetes); smaller effect when glucose is normal.
- Alpha-lipoic acid — Small drops in fasting glucose, insulin and HbA1c in meta-analyses; no real counter to GH- or insulin-driven resistance.
- Psyllium husk fiber — Slows sugar absorption: lower fasting glucose and HbA1c, mostly in people with diabetes.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Which doctors can help
Get medical help at once if
- A new lump (including in the neck), trouble swallowing or persistent hoarseness, unexplained weight loss, or blood in stool or urine — see a doctor promptly.
In an emergency, call your local emergency number.
Myth & fact
“Mod GRF is a 'natural GHRH fragment', so it is risk-free.”
It is a modified synthetic peptide never tested in clinical trials; GH-related effects and unverified vial contents are real risks.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check