BPC-157
PreclinicalA synthetic 15-amino-acid peptide studied in animals for effects on tendon, ligament and gut tissue repair. No completed human trials.
Healing & recovery
Guide
Injection sites and rotation
Where subcutaneous injections go, and why using the same spot repeatedly is the most common avoidable problem.
Almost everything discussed on this site is injected subcutaneously, into the fat layer under the skin instead of into muscle. The technique is straightforward; the part people get wrong is rotation.
Repeatedly injecting the same square inch of tissue causes local irritation, and over time can produce lumps and hardened areas that change how the injection is absorbed. Once that develops it takes months to settle.
Common subcutaneous sites
The abdomen, avoiding roughly two inches around the navel, is the most commonly used site and generally has the most consistent fat layer. The outer thigh and the back of the upper arm are the usual alternatives.
Pick areas with a layer of fat you can pinch. Injecting subcutaneously into somewhere very lean risks going into muscle instead, which is a different absorption profile and usually more uncomfortable.
Rotating properly
Rotation means moving between distinct areas, not just shifting a centimetre. A simple approach is to work systematically across a site, left then right, moving position each time, so you do not come back to the same spot for a week or two.
Writing down where you injected is the only reliable way to do this. Nobody remembers accurately after the third week, which is exactly when it starts to matter.
A written rotation record
The tracking workbook has a sheet for this, and the app will do it automatically.
Mild redness that settles within a day
Common and generally not a concern on its own.
Lumps or hardened tissue
Stop using that area entirely and give it months. Continuing to inject into it makes it worse and changes absorption.
Spreading redness, warmth, swelling or fever
These are signs of infection rather than irritation. Stop and seek medical care.
Sharps
Never recap a used needle, and never reuse one. They blunt after a single pass, and a blunt needle causes far more tissue trauma. Use a proper sharps container and check how your local authority wants it disposed of.
Where this comes up
Semaglutide
ApprovedA long-acting GLP-1 receptor agonist approved for type 2 diabetes and for weight management, dosed once weekly.
Weight loss
Tesamorelin
Approved for another indicationA GHRH analogue approved by the FDA for reducing excess visceral fat in HIV-associated lipodystrophy. The only compound in this category with completed phase 3 trials.
Muscle & performance · Weight loss · Anti-aging & longevity
Related guides
This page is educational. It describes what published research reports, not what you should do. Peptides discussed here are largely not approved for human use, and nothing on Bioalmanac is medical advice.
Last updated 12 Aug 2026
Terms used here
- Subcutaneous
- Into the layer of fat beneath the skin rather than into muscle. The route almost every peptide on this site uses.
- Injection site
- Where on the body an injection is given. Rotating between sites is standard practice for anything given repeatedly.
- Bioavailability
- How much of an administered dose actually reaches the bloodstream. Injection is close to complete; swallowing a peptide is usually close to nothing.