# Anti-ageing skin: what the research says Skin research on GHK-Cu and TB-500 comes mainly from cell and animal studies. In a laboratory cell study, GHK-Cu increased collagen production; one small human study after laser resurfacing found no clear measured difference between groups. The FDA’s May 2026 briefing document identified no human study of TB-500, and the closest skin result is a 2003 study in aged mice of its parent protein. Neither record establishes how ageing human skin changes. Under the surface of your skin sits a woven layer of protein fibres. One of those fibres is collagen, a strong structural protein. Cells called fibroblasts make the fibres around them, and tissue is taken apart and rebuilt over time, a process called remodelling. Most peptide research on skin starts with those cells, often in a dish rather than in a person. This hub follows the two items the quiz offers for this goal. The [GHK-Cu study guide](/learn/ghk-cu/ghk-cu-study-findings) sorts its collagen, tissue and skin measurements. The [TB-500 study guide](/learn/tb-500/what-does-tb-500-do) separates the fragment from its parent protein. Each answer below names the study type first, because a dish, a mouse and a person answer different questions. ## What has research not shown about GHK-Cu, TB-500 and ageing skin? Research cited here has not shown that GHK-Cu or TB-500 changes ageing skin in people. The human GHK-Cu trial in the [GHK-Cu study guide](/learn/ghk-cu/ghk-cu-study-findings), published in *Archives of Facial Plastic Surgery* in 2006, had thirteen people complete it after laser resurfacing. Objective skin assessment found no significant group difference, while patient questionnaires favoured the GHK-Cu group. A satisfaction rating does not measure the skin itself. Thirteen people is a small group. A study that size can miss a real difference, and it also cannot prove the groups were the same. The findings belong to healing after laser resurfacing, so they leave other skin questions open. TB-500 has no human skin result at all. Three small Phase 2 trials, mid-stage tests in modest patient groups, used full-length thymosin beta-4 on skin wounds instead. In the pressure-ulcer trial, 8 of 54 treated people (15%) and 3 of 18 on placebo (17%) had healed at day 84, with no significance test in the record (ClinicalTrials.gov NCT00382174). A pressure ulcer is a bed sore. None of the three trials used TB-500. ## What have GHK-Cu studies found about skin? GHK-Cu studies have found collagen and tissue changes in laboratory models, not a measured skin change in living people. In a 1988 *FEBS Letters* study, GHK-Cu increased collagen production in cultured fibroblasts without a change in cell number. A 1993 *Journal of Clinical Investigation* study linked GHK-Cu to more connective-tissue material inside experimental wound chambers in rats. The [GHK-Cu hub](/learn/ghk-cu) gathers the wider record. A wound chamber is an artificial pocket for collecting tissue, so it says little about how a real scar looks. A 2000 *Life Sciences* cell study then found more of both sides of remodelling: MMP-2, an enzyme that breaks down the scaffold, and proteins that restrain such enzymes. Counting both sides still does not tell you the final balance in living skin. Skin as a barrier was tested too. A 2011 *Inflammation Research* study placed isolated human skin layers in laboratory equipment and tracked copper, not the whole peptide. Human tissue on a bench is still not a trial in living people, which is why the 2006 after-laser trial carries so much of the weight. ## What have TB-500 studies found about skin? TB-500 skin evidence consists of a mouse study of related molecules and a cell test of TB-500 itself. TB-500 is a seven-amino-acid piece of thymosin beta-4, with an acetyl chemical tag added. In a 2003 *Wound Repair and Regeneration* study of aged mice, thymosin beta-4 and the untagged fragment each increased skin closure and collagen content on day 7. That animal result does not describe TB-500. The cell test came in 2024. In the *Journal of Chromatography B* study, scratched fibroblasts were watched for 8 hours. TB-500 did not close the gap significantly more than vehicle, the liquid without TB-500. A cell result like that does not show an effect in a living body. The FDA’s briefing document, in a memo dated 15 May 2026, says it ‘remains unknown’ whether either TB-500 form has wound-healing properties in a living body. The FDA adds that the acetyl tag changes how a peptide behaves, so results for the untagged fragment cannot be directly carried over. The [TB-500 hub](/learn/tb-500) and the [TB-500 identity page](/learn/peptide-quality-verification/tb-500-vs-thymosin-beta-4) keep the two molecules apart. ## Why does the study type matter for a skin finding? Study type decides what a skin finding can mean. A cell result describes cells in a dish, an animal result describes that animal, and only a trial in living people measures human skin. The GHK-Cu record reaches one small human trial after laser resurfacing. The TB-500 record stops at mice and cells, and the [TB-500 study guide](/learn/tb-500/what-does-tb-500-do) lists each step. Picture each study as one rung on a ladder. A dish sits at the bottom, a mouse sits higher up, and a trial in people sits near the top. A finding gains weight each time it holds on the next rung, and the table below shows the highest rung each item has reached so far. ## Comparison Each row is one item the quiz offers for the Anti-ageing skin goal: what studies found, in the quiz’s own words, and the type of study behind that line. Rows are not pooled, and they do not compare the size of any effect. | Quiz item | What studies found | Study type | Read the research | Product | | --- | --- | --- | --- | --- | | GHK-Cu | Linked to more collagen in cell studies. A small human skin study found no clear measured difference. | Cell studies and one small human skin study | [GHK-Cu study guide](/learn/ghk-cu/ghk-cu-study-findings) | [GHK-Cu](/shop/ghk-cu) | | TB-500 | Linked to faster skin-wound closure in a mouse study of its parent protein. No human study of TB-500 was found. | One mouse study of its parent protein | [TB-500 study guide](/learn/tb-500/what-does-tb-500-do) | [TB-500](/shop/tb-500) | ## Frequently asked questions ### Does GHK-Cu increase collagen in human skin? Not in the studies cited here. The collagen finding comes from cultured fibroblasts in a 1988 *FEBS Letters* study. A cell result cannot show what happens to collagen in a person’s skin. ### Is TB-500 the same as thymosin beta-4? No. TB-500 is a short, chemically tagged fragment of the larger thymosin beta-4 protein. The FDA’s May 2026 briefing document says findings on the full protein or the untagged fragment cannot be directly extrapolated to TB-500. ### Is research on human skin samples a clinical trial? Not always. The 2011 copper study used isolated human skin in laboratory equipment. A clinical trial follows living people, so the word human there names the tissue source, not the study design. ### Do patient ratings show that skin changed? No. In the 2006 after-laser GHK-Cu trial, patient questionnaires and objective skin assessment gave different answers. A rating records how people judged their skin, which is a separate question from a measured change. ## Citations - Miller TR, Wagner JD, Baack BR, Eisbach KJ.. Archives of Facial Plastic Surgery. 2006;8(4):252-259 — skin measurements and patient ratings after laser resurfacing. DOI: 10.1001/archfaci.8.4.252 - Maquart FX, Pickart L, Laurent M, Gillery P, Monboisse JC, Borel JP.. FEBS Letters. 1988;238(2):343-346 — collagen production in fibroblast cultures. DOI: 10.1016/0014-5793(88)80509-X - Maquart FX, Bellon G, Chaqour B, et al.. Journal of Clinical Investigation. 1993;92(5):2368-2376 — connective-tissue accumulation in rat wound chambers. DOI: 10.1172/JCI116842 - Siméon A, Emonard H, Hornebeck W, Maquart FX.. Life Sciences. 2000;67(18):2257-2265 — MMP-2 and its inhibitors in fibroblast cultures. DOI: 10.1016/S0024-3205(00)00803-1 - Hostynek JJ, Dreher F, Maibach HI.. Inflammation Research. 2011;60(1):79-86 — copper retention and passage through isolated human skin. DOI: 10.1007/s00011-010-0238-9 - Philp D et al.. Wound Repair and Regeneration. 2003;11(1):19-24. DOI: 10.1046/j.1524-475x.2003.11105.x - Rahaman KA et al.. Journal of Chromatography B. 2024;1235:124033. DOI: 10.1016/j.jchromb.2024.124033 [Take the quiz: Anti-ageing skin](https://stack.formlaboratories.com) Opens the Form Laboratories quiz at stack.formlaboratories.com. Research use only — not for human or animal use. ## Articles in this hub --- Canonical page: https://www.formlaboratories.com/learn/anti-ageing-skin Form Laboratories - Perth-based research-use-only peptide supplier, shipping Australia-wide. - Site guide for agents: https://www.formlaboratories.com/llms.txt - Sitemap: https://www.formlaboratories.com/sitemap.xml - Full catalogue: https://www.formlaboratories.com/shop - Contact: hello@formlaboratories.com All materials are supplied for laboratory research use only - not for human or veterinary use, and nothing on this site is medical advice.