If you are using a GLP-1 medication like semaglutide or tirzepatide for weight loss, you may be losing muscle along with fat. CJC-1295 and tesamorelin are two growth hormone secretagogues that can help preserve lean mass during a calorie deficit. This guide compares them directly and gives you a practical dosage protocol for Canada.
Why Muscle Loss Happens on GLP-1s
GLP-1 receptor agonists reduce appetite and slow gastric emptying. You eat less, and the scale drops fast. But rapid weight loss often includes 20 to 40 percent lean body mass. That muscle loss slows your metabolism and makes weight regain more likely. Adding a growth hormone secretagogue can shift the ratio toward fat loss while sparing muscle.
Both CJC-1295 and tesamorelin increase your body's own growth hormone production. Higher growth hormone levels promote protein synthesis and fat oxidation. This helps you hold onto muscle even when calories are low.
CJC-1295 vs Tesamorelin: Key Differences
The main difference is how long each peptide stays active in your body. CJC-1295 has a long half-life because it binds to albumin. Tesamorelin has a shorter half-life but is approved for reducing belly fat in HIV patients. For muscle preservation on a GLP-1, CJC-1295 is often preferred for its steady release.
- CJC-1295: Modified GHRH analog, half-life of 6 to 8 days, injected once or twice weekly.
- Tesamorelin: GHRH analog, half-life of 26 to 30 minutes, injected daily.
If you want fewer injections, CJC-1295 wins. If you want a peptide with more clinical data for fat loss, tesamorelin has stronger evidence. But for muscle preservation specifically, CJC-1295's continuous elevation of growth hormone may be more anabolic.
How Each Peptide Works for Muscle Preservation
CJC-1295 stimulates the pituitary to release growth hormone in pulses. Because it stays in your system for days, you get a low but constant elevation. This supports muscle protein synthesis around the clock. Tesamorelin causes a sharp spike after each injection, which then fades quickly. That spike is good for fat oxidation but less ideal for steady muscle building.
When you are on a GLP-1, your insulin levels are lower. Growth hormone helps mobilize fat for energy, so your body is less likely to break down muscle for fuel. Both peptides do this, but CJC-1295 does it more consistently.
Dosage Guide for CJC-1295 in Canada
For muscle preservation on a GLP-1, the standard CJC-1295 dosage is 1 to 2 mg per week, split into one or two injections. Many Canadian users start at 1 mg weekly and increase to 2 mg if tolerated. Inject subcutaneously in the abdomen or thigh.
- Beginner: 1 mg once weekly for 4 weeks.
- Standard: 1 mg twice weekly (total 2 mg per week).
- Cycle length: 12 to 16 weeks, then take 4 weeks off.
You can buy CJC-1295 2 mg vials from Canadian peptide suppliers. Reconstitute with 1 to 2 mL of bacteriostatic water. A 1 mg dose is then 0.5 to 1 mL depending on dilution.
Dosage Guide for Tesamorelin in Canada
Tesamorelin is typically dosed at 2 mg once daily, injected subcutaneously. The approved dose for HIV-related lipodystrophy is 2 mg per day. For muscle preservation on a GLP-1, the same dose is used off-label.
- Standard: 2 mg daily, ideally at the same time each day.
- Cycle length: 12 to 20 weeks, then reassess.
Tesamorelin is more expensive than CJC-1295 because you need daily injections. A 10 mg vial lasts only 5 days at the 2 mg dose. That adds up quickly in Canada, where prices range from $60 to $100 per 10 mg vial.
Which One Should You Choose?
If you want convenience and lower cost, choose CJC-1295. If you want a peptide with more human clinical data for fat loss and are willing to inject daily, choose tesamorelin. For muscle preservation specifically, CJC-1295 is the better value in Canada.
Some users stack both, but that is not necessary and increases cost. Start with one and monitor your body composition. If you are losing more than 1 pound per week on a GLP-1, you likely need a growth hormone secretagogue to protect muscle.
Combining with GLP-1 Medications
You can safely use CJC-1295 or tesamorelin alongside semaglutide or tirzepatide. There are no known dangerous interactions. However, both peptides can lower blood sugar slightly. If you are diabetic and on medication, monitor your glucose closely.
For best results, keep protein intake high at 1.6 to 2.2 grams per kilogram of body weight. Resistance train at least three times per week. The peptide will not build muscle on its own, but it will help you keep what you have while cutting calories.
Side Effects and Safety
Both peptides are generally well tolerated. Common side effects include injection site redness, mild headache, and water retention. CJC-1295 can cause a temporary increase in heart rate. Tesamorelin may cause joint pain or swelling in some users.
Long-term safety data is limited. Do not use either peptide if you have active cancer, as growth hormone can stimulate tumor growth. Always buy from a reputable Canadian supplier that provides third-party testing.
Where to Buy in Canada
You can buy CJC-1295 and tesamorelin from online peptide vendors that ship within Canada. Look for suppliers that offer lab reports and accept e-transfer or credit card. Avoid international sellers that may have customs delays.
For muscle recovery support, you might also consider BPC-157 vs TB-500 for muscle recovery. These peptides work differently but can complement a GLP-1 protocol. If you are in Quebec, check the BPC-157 dosage guide for Quebec for local sourcing tips.
Final Verdict
CJC-1295 is the better choice for most Canadians who want to preserve muscle on a GLP-1. It requires fewer injections, costs less per month, and provides steady growth hormone elevation. Tesamorelin is a solid alternative if you prefer a peptide with more clinical backing for fat loss. Whichever you choose, pair it with adequate protein and strength training to get the full benefit.
This article discusses peptides as research compounds. It is not medical advice.