PLU Laboratories

Free shipping on every order is stated, though it appears alongside the subscription options rather than being confirmed separately for one-time purchases, so check at checkout. The brand ships within the United States and to select international markets, and the product is also stocked on Amazon, which may be a faster route depending on where you are.

PLU Laboratories accepts 30-day returns even if you have opened the bottle, which is genuinely generous for skincare, where opened product is usually excluded. The full refund policy sits on a separate page. Note that no contact email or telephone number is published and the address is given only as Prospect Heights, IL 60070, so initiate any return through the site's contact page and keep a record of the request.

Yes, and to an unusually high standard. Testing is attributed to the Mass Spectrometry Core at the University of Illinois at Chicago, using LC-MS to verify the active content in the finished bottle at or above label claim, and ICP-MS for heavy metals, with dated reports covering purity and concentration and heavy metals separately. Confirming actual peptide concentration in a finished cosmetic is something very few brands do at all, and naming an academic core facility rather than an unidentified lab makes it checkable.

1% Copper Tripeptide-1, confirmed by LC-MS, which is both a meaningful concentration and rare transparency for skincare. Be aware that although the page states concentrations are disclosed, the two other actives, Palmitoyl Tripeptide-1 and Palmitoyl Tetrapeptide-7, have no percentages given, and the published research on that pairing depends on specific concentrations. The full ingredient list is water, glycerin, Copper Tripeptide-1, phenoxyethanol, Palmitoyl Tripeptide-1 and Palmitoyl Tetrapeptide-7.

Apply two to three drops to the face and neck morning, night or both, and allow about sixty seconds to absorb before layering anything else. The page does not mention incompatibilities, but it is worth knowing that copper peptides should not be applied in the same step as L-ascorbic acid vitamin C or a direct acid exfoliant, since the copper can oxidise the vitamin C and the low pH can destabilise the peptide complex. Use them at different times of day instead. Note too that the bottle has a six-month period after opening, so do not stockpile.

The mechanism is well studied. GHK-Cu has decades of laboratory and wound-healing research behind its effects on collagen pathways, and the palmitoyl peptide pairing here has genuine published support for the appearance of fine lines. What is more modest is the human trial evidence for cosmetic wrinkle outcomes specifically, which rests on small studies, and no topical peptide matches retinoids for photoageing or sunscreen for prevention. The brand's own estimate of visible results at six to eight weeks of consistent use is realistic rather than overstated, which is to its credit.

The warnings on the page are appropriate: external use only, avoid the eyes, discontinue if irritation occurs, patch test before first use, and consult a dermatologist if you have a known skin condition. Allergic contact dermatitis to copper is uncommon but documented, so the patch test matters. Anyone with Wilson's disease or another copper metabolism disorder should check with a clinician first, although absorption from a topical serum is minimal. Pregnancy and breastfeeding are not addressed on the page, so raise it with your doctor if relevant.

Every PLU Laboratories code listed on smartstorereview is tested against the live checkout before publication and rechecked regularly, with expired codes removed and the last verified date shown beside each offer. The brand already advertises a 15% subscription discount and a first-order promotional code, and these may not stack, so compare the options. If you subscribe, consider lengthening the default interval, since a 30 mL bottle shipping every eight weeks is likely to arrive faster than you can use it.