Comparison
Curcumin vs GHK-Cu
Side-by-side of Curcumin and GHK-Cu. Every row below is pulled from the compound schema and will update as our data grows. For deeper reads, follow through to each compound page.
Curcumin
Curcumin supplement guide: turmeric extract at 500-1000 mg/day, piperine and Meriva for absorption, evidence in joint inflammation and mood.
GHK-Cu
GHK-Cu peptide (glycyl-L-histidyl-L-lysine copper) is a topical copper peptide. Trials show fine-line and wound-healing gains; injectable longevity claims rem.
Effects at a glance
Curcumin
- •Reduces osteoarthritis knee pain comparable to ibuprofen at 1500 mg/day enhanced formulation
- •Modest antidepressant effect (SMD ~0.34) as monotherapy or SSRI adjunct in major depression
- •Standard curcumin has ~3% bioavailability; Meriva, BCM-95, Theracurmin shift absorption 5-30 fold
- •Inhibits NF-kB and COX-2; reduces hs-CRP, IL-6, TNF-alpha in chronic inflammation
- •Antiplatelet effect at higher doses; meaningful interaction with warfarin and DOACs
- •Iron chelation can contribute to deficiency in already-marginal patients
GHK-Cu
- •Endogenous tripeptide that binds copper(II); plasma levels decline ~60% from age 20 to 60
- •Topical RCTs show improvement in skin firmness, fine lines, and barrier function over 12 weeks
- •Wound-healing models report accelerated re-epithelialization in diabetic and aged skin
- •Pickart gene-expression analyses show reset of >4000 genes toward a younger expression profile in cell culture
- •Anecdotal subcutaneous longevity protocols use 1 to 3 mg daily; no human longevity RCTs exist
- •Hair-growth claims rest on small open-label trials and topical scalp formulations
Side-by-side
| Attribute | Curcumin | GHK-Cu |
|---|---|---|
| Category | natural | peptide |
| Also known as | turmeric extract, diferuloylmethane | Copper Peptide, Glycyl-L-histidyl-L-lysine copper, GHK |
| Half-life (hr) ↗ | 7 | 0.5 |
| Typical dose (mg) ↗ | 500 | 2 |
| Dosing frequency | 1 to 2 times daily with meals | daily |
| Routes | oral | topical, subcutaneous |
| Onset (hr) | 2 | 24 |
| Peak (hr) | 4 | 168 |
| Molecular weight | 368.38 | 340.85 |
| Molecular formula | C21H20O6 | C14H24N6O4 (GHK alone); C14H22CuN6O4 with Cu(II) |
| Mechanism | Inhibits NF-kB transcription factor, COX-2, and lipoxygenase; activates AMPK and Nrf2; modulates JAK-STAT and PI3K-Akt kinase signaling. Pleiotropic anti-inflammatory and antioxidant effects. | Tripeptide that chelates Cu(II) and delivers it to copper-dependent enzymes (lysyl oxidase, superoxide dismutase). Modulates expression of >4000 genes toward a younger profile in fibroblast culture, including upregulation of decorin and downregulation of pro-inflammatory cytokines. |
| Legal status | Dietary supplement (global) | Topical cosmetics legal in most jurisdictions; injectable form not FDA approved for any indication; research-use-only grey market |
| WADA status | allowed | allowed |
| DEA / Rx | Not scheduled | Topical OTC (cosmetic); injectable not FDA approved; research-chemical status |
| Pregnancy | Culinary turmeric is safe; supplemental curcumin best avoided in pregnancy | Insufficient data; topical use likely low-risk; injectable not recommended |
| CAS | 458-37-7 | 49557-75-7 |
| PubChem CID | 969516 | 73587 |
| Wikidata | Q312266 | Q3104638 |
Safety profile
Curcumin
Common side effects
- nausea
- diarrhea
- dyspepsia
- yellow stool (benign)
Contraindications
- active gallstones (curcumin stimulates gallbladder contraction)
- severe biliary obstruction
- scheduled elective surgery (discontinue 1-2 weeks prior)
Interactions
- warfarin and DOACs: additive antiplatelet and anticoagulant effects; meaningful bleeding risk at 1000+ mg/day(major)
- aspirin and NSAIDs: additive antiplatelet effect(moderate)
- tacrolimus and cyclosporine: CYP3A4 and P-gp modulation may alter drug levels(moderate)
- iron supplements: curcumin chelates iron; can contribute to deficiency in marginal patients(moderate)
- chemotherapy agents: potential interference with multiple agents; coordinate with oncology team(major)
GHK-Cu
Common side effects
- mild erythema at topical site
- transient itch
- blue-green discoloration of injection site (copper)
- rare contact dermatitis
Contraindications
- copper allergy
- Wilson disease
- open wound near injection site (caution)
- pregnancy (no data)
Interactions
- topical retinoids: additive irritation; alternate days or apply at different times(minor)
- topical vitamin C (ascorbic acid): ascorbate reduces Cu(II) to Cu(I), which can destabilize the GHK-Cu complex; separate by 30 minutes(minor)
Which Should You Take?
Curcumin comes out ahead for most readers on the criteria we weight: 3 catalogued goals, OTC dietary supplement, oral dosing, with a Tier-B outcome catalogued. GHK-Cu is the right call when one of the conditionals below applies.
- → If your priority is post-training recovery, pick Curcumin.
- → If your priority is joint health, pick Curcumin.
- → If your priority is skin health, pick GHK-Cu.
- → If your priority is wound healing, pick GHK-Cu.
Edge case: If you want to avoid research-only / gray-market sourcing, Curcumin is the more accessible choice.
Default choice: Curcumin. Lower friction to source, and broader goal coverage. Reach for GHK-Cu only if your priority sits squarely in the goals it owns above.
This verdict is generated from each compound's schema (goals, legal status, evidence outcomes, dosing route). It updates automatically as our compound data evolves; the deeper read sits on each individual compound page.
Common questions
What is the difference between Curcumin and GHK-Cu?
Curcumin and GHK-Cu differ in category (natural vs peptide), mechanism, and typical dosing. See the side-by-side table for full details.
Which has a longer half-life, Curcumin or GHK-Cu?
Curcumin half-life is 7 hours; GHK-Cu half-life is 0.5 hours.
Can you stack Curcumin with GHK-Cu?
Stack compatibility depends on mechanism overlap, legal status, and individual response. Check each compound page for specific interactions and contraindications before combining.
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