How to Use Peptides: Injection, Reconstitution & Storage

Most therapeutic peptides are administered via subcutaneous (SC) injection — a small needle inserted into the fatty tissue just under the skin. Common injection sites include the abdomen (2 inches away from the navel), the front of the thigh, and the back of the upper arm. The process: clean the injection site with an alcohol swab, pinch a fold of skin, insert the needle at a 45-90 degree angle (depending on needle length), inject slowly, release the skin fold, and withdraw the needle. Apply gentle pressure with a clean swab — do not rub. Needle gauge: 27-31 gauge insulin syringes are standard for peptide SC injections. These are very thin needles that cause minimal discomfort. Most peptides use 0.3-1.0 mL insulin syringes. Rotate injection sites to prevent lipodystrophy (changes in fat tissue from repeated injections in the same spot). Keep a mental map or simple log of where you inject.

Most compounded peptides arrive as lyophilized (freeze-dried) powder in small vials. They must be reconstituted with bacteriostatic water (BAC water) before use. Step by step: Remove caps from both the peptide vial and BAC water vial. Swab both rubber stoppers with alcohol. Draw the prescribed amount of BAC water into a syringe. Insert the needle into the peptide vial and let the water trickle slowly down the inside wall of the vial — never spray directly onto the powder, as this can damage the peptide. Allow the powder to dissolve on its own. You can gently swirl the vial but never shake it — shaking can denature the peptide. The amount of BAC water determines the concentration. Your clinician or pharmacy should specify the exact reconstitution volume. Once reconstituted, the solution should be clear — if it's cloudy or contains particles, do not use it.

Proper storage is critical for maintaining peptide potency: Unreconstituted (lyophilized) peptides: Store in the refrigerator (36-46°F / 2-8°C). They can be kept at room temperature during shipping but should be refrigerated promptly. Properly stored lyophilized peptides can remain stable for months to years depending on the compound. Reconstituted peptides: Must be refrigerated immediately. Most reconstituted peptides maintain potency for 2-4 weeks when refrigerated. Never freeze reconstituted peptides. Protect from light — some peptides are photosensitive. General rules: Keep vials upright. Avoid temperature fluctuations. Do not leave peptides in hot cars, direct sunlight, or near heat sources. Use reconstituted peptides within the timeframe specified by your pharmacy.

Some peptides are available as nasal sprays — most commonly Semax, Selank, and their derivatives. Nasal delivery bypasses the digestive system and provides direct access to the CNS through the olfactory and trigeminal nerve pathways. Usage: Prime the spray before first use (pump until a fine mist appears). Tilt your head slightly forward. Insert the nozzle into one nostril, aim slightly toward the outer wall (not the septum), and spray while gently inhaling. Alternate nostrils between sprays. Store nasal peptides in the refrigerator. The nasal mucosa can be affected by congestion — if you have a cold or allergies, absorption may be reduced.

Most peptides cannot be taken orally because stomach acid and digestive enzymes break them down before absorption. However, some exceptions exist: MK-677 (ibutamoren) is technically a non-peptide small molecule that is orally bioavailable — it can be taken as a capsule or liquid. Oral semaglutide (Rybelsus/Wegovy pill) uses a special absorption enhancer (SNAC) to protect the peptide and facilitate absorption. It must be taken on an empty stomach with no more than 4 oz of water, and patients must wait 30 minutes before eating or drinking. BPC-157 has been studied in oral form for gut-related applications, though injectable forms are more common for musculoskeletal use. Sublingual troches (lozenges held under the tongue) are another oral delivery method used for some compounded peptides like sermorelin + glycine combinations.

Never self-administer injectable peptides without clinician guidance. Use only sterile, single-use needles and syringes. Dispose of sharps in an approved sharps container — never in regular trash. Wash hands thoroughly before handling any peptide or injection supplies. If a vial shows any sign of contamination (cloudiness, particles, color change), discard it. Do not share needles, syringes, or multi-dose vials. Keep a log of: what peptide you're using, the dose, injection site, time, and any side effects. This information is valuable for your clinician in optimizing your protocol.