sermorelin skin: Frequently asked questions

First, verify that your IGF-1 levels have actually increased. Sermorelin's effect is mediated entirely through IGF-1 elevation, so if serum IGF-1 remains unchanged, the peptide isn't working regardless of dosing. Request a baseline and follow-up IGF-1 test from your prescribing physician. If IGF-1 hasn't risen into the upper-normal range (200–300 ng/mL), the issue is either pituitary non-responsiveness, incorrect dosing, or peptide degradation from improper storage. Some patients over age 60 have diminished pituitary reserve and require higher doses (500 mcg) or combination protocols with GHRP-2 or GHRP-6 to achieve meaningful IGF-1 elevation.

Continue the protocol through week 20–24 before assessing efficacy. Dermal remodelling is a slow process. Fibroblasts must synthesise procollagen, secrete it into the extracellular matrix, and allow enzymatic cross-linking into mature collagen fibrils before structural density increases enough to produce visible tightening. IGF-1 levels should be measured at week 8 and week 16 to confirm the upstream hormone response is occurring. If IGF-1 remains below 180 ng/mL despite consistent sermorelin use, the issue may be pituitary reserve (age-related decline in GHRH receptor density) or dosing insufficiency.

Discard it if it was reconstituted and left at room temperature for more than 8 hours. Peptides are proteins, and protein denaturation begins at temperatures above 8°C. The tertiary structure unravels, rendering the molecule inactive even if the solution still looks clear. Unreconstituted lyophilised sermorelin can tolerate brief temperature excursions (up to 25°C for 48 hours), but once mixed with bacteriostatic water, refrigeration at 2–8°C is mandatory. There's no home test for potency loss. If thermal integrity is compromised, assume the vial is non-functional.

Not at all. Retinoids and sermorelin work through completely different mechanisms and are synergistic when combined. Tretinoin upregulates collagen gene expression in the epidermis and accelerates cell turnover, while sermorelin drives systemic IGF-1 elevation that stimulates fibroblast activity deeper in the dermis. A 2020 study found that patients using both interventions showed 23% greater improvement in skin thickness compared to either treatment alone. Just manage the initial retinoid adjustment period carefully. Increased cell turnover can cause temporary dryness and sensitivity.

No, the improvements don't vanish overnight. But they do gradually regress. Collagen has a half-life of approximately 15 years in dermal tissue, but new collagen synthesis slows dramatically once IGF-1 levels return to baseline. Most patients maintain visible improvements for 3–6 months after stopping therapy, then experience gradual thinning and loss of firmness as fibroblast activity declines. If you've achieved your goal elasticity, transitioning to a maintenance protocol (200 mcg three nights per week) can preserve results without the cost and commitment of daily dosing.

IGF-1 levels return to baseline within 2–3 weeks of stopping sermorelin, which means collagen synthesis rates drop back to pre-treatment levels. Cycling (e.g., 12 weeks on, 8 weeks off) will produce temporary improvements that reverse during off-cycles. For sustained dermal benefits, continuous use is required. That said, intermittent protocols can still provide value for wound healing or post-procedure recovery. Short bursts of elevated IGF-1 accelerate tissue repair even if the long-term structural benefit isn't maintained.