MEDICAL DISCLAIMER: Educational research guidelines only. Lyophilized peptides are investigational chemical compounds and are NOT approved for human consumption, diagnosis, or therapy. Consult a licensed physician before any research application.
Tripeptide-29 Dosage Chart, Schedule & Reconstitution Protocol
Quickstart Highlights
Tripeptide-29 is the INCI name for synthetic glycine-proline-hydroxyproline (Gly-Pro-Hyp), the most common repeating unit of type I collagen, used as a collagen-stimulating cosmetic peptide. It works by matrikine signaling: fibroblasts read the Gly-Pro-Hyp sequence as a fragment of broken-down collagen and respond by making new collagen, with in-vitro testing showing up to ~400% more type I collagen at 3% [1]. Its real routes are topical (0.1-1% in serums/creams) and oral (collagen tripeptide ~1,000-2,500 mg/day); orally, Gly-Pro-Hyp is one of the few collagen peptides absorbed largely intact and detectable in blood within 30-120 minutes (PMID 27573716, PMID 35662250). Randomized trials of oral collagen tripeptide at 1,000 mg/day for 12 weeks report improved skin hydration, elasticity and wrinkles (PMID 29949889), while human evidence for the topical ingredient is still in-vitro only. It has no FDA/EMA drug approval; the subcutaneous reconstitution figures here are an educational measurement reference, not an injection protocol.
Reconstitute: Add 2.5 mL bacteriostatic water → 20 mg/mL concentration.
Typical dose: Topical 0.1–1% in skincare; oral collagen tripeptide ~1000–2500 mg/day
Easy measuring: At 20 mg/mL, 1 unit = 0.01 mL = 0.2 mg (200 mcg) on a U-100 insulin syringe.
Storage: Lyophilized Gly-Pro-Hyp powder: store sealed, frozen at −20 °C, protected from moisture and light. Reconstituted solution (educational model): refrigerate at 2-8 °C and use within ~4 weeks. Finished cosmetic serums/creams: store at room temperature, away from heat and direct light.
Half-life: Not formally established. Topical use has no meaningful systemic half-life; orally, Gly-Pro-Hyp and Pro-Hyp peak in plasma ~30-120 min and clear over a few hours [3][4][5].
Route: Real-world routes are topical (0.1-1% leave-on) and oral (collagen tripeptide ~1,000-2,500 mg/day); modeled here as a subcutaneous reconstitution for measurement only, not an injectable drug.
Status: Cosmetic INCI / food-supplement ingredient; not FDA- or EMA-approved as a drug. Human efficacy for the topical form is in-vitro only. Educational content, not medical advice.
About Tripeptide-29
Tripeptide-29 is a cosmetic collagen-stimulating peptide — the synthetic tripeptide glycine-proline-hydroxyproline (Gly-Pro-Hyp), sold under trade names such as AC Collagen Prepeptide — used to signal dermal fibroblasts to make new collagen [1][2]. Its genuine routes of use are topical (leave-on skincare at 0.1-1%) and oral (collagen-tripeptide powders and capsules at about 1000-2500 mg/day); it is not an injectable drug. The subcutaneous reconstitution figures below are an educational measurement reference that mirrors how this site catalogs every compound, not a real-world delivery method [1].\n\nFor that educational model, a 50 mg vial reconstituted with 2.5 mL of bacteriostatic water yields a 20 mg/mL solution, so 200 mcg falls on each U-100 insulin-syringe unit. A 1,000 mcg amount measures 5 units, 5,000 mcg measures 25 units, and 10,000 mcg measures 50 units — a range chosen to mirror the mass that a 0.1-1% topical serum delivers in a single ~1 mL (≈1 g) application.\n\nIn real-world practice the Tripeptide-29 dosage is expressed as a concentration (topical) or grams per day (oral), not as injection units: topical 0.1-1% once or twice daily, or oral collagen tripeptide roughly 1000-2500 mg/day, with 1000 mg/day being the dose used in most randomized skin trials [6][7].\n\nFrequency: Apply once daily topically (or take once daily orally); the educational subcutaneous model here uses one dose per day. Tripeptide-29 has no FDA or EMA drug approval, and this page is educational, not medical advice.
Quick Protocol Navigation
Reconstitution Instruction & Mixing Step-by-Step
Lyophilized powder must be reconstituted carefully. Agitating peptide chains can shear disulfide bonds and render the peptide biologically inert.
Draw 2.5 mL of bacteriostatic water into a sterile syringe (this yields a 20 mg/mL solution from a 50 mg Tripeptide-29 vial, i.e. 200 mcg per insulin-syringe unit).
Inject the water slowly down the inner wall of the vial; Gly-Pro-Hyp is fully water-soluble, but avoid spraying directly onto the powder and do not shake vigorously.
Gently swirl or roll the vial until the solution is completely clear and colorless.
Store refrigerated at 2-8 °C and draw the prescribed units per dose (1,000 mcg = 5 units, 5,000 mcg = 25 units, 10,000 mcg = 50 units).
Educational note: Tripeptide-29 is used topically or orally in practice, not by injection — these subcutaneous reconstitution figures are a measurement reference only; for topical use the equivalent mass is added to a water-based serum at 0.1-1% by weight.
Interactive Tripeptide-29 Syringe Calculator
Currently visualizing the 50 mg vial reconstituted with 2.5 mL bacteriostatic water. Adjust the target dose to dynamically render syringe units.
Reconstitution Calculation: 50mg dry powder in 2.5mL water yields 20.00 mg/mL. To evaluate a 250mcg dose, pull to 1.3 units (1 syringe ticks).
U-100 Syringe Representation
Educational reference visual. Assumes standard U-100 insulin syringe where 1.0 mL volume = 100 units.
Titration & Dose Escalation Schedules
| Phase | Dose per injection | Units (per injection) |
|---|---|---|
| Introductory (≈0.1% topical equivalent) | 1000 mcg (1 mg) | 5 units (0.05 mL) |
| Standard cosmetic (≈0.5% topical equivalent) | 5000 mcg (5 mg) | 25 units (0.25 mL) |
| Maximal cosmetic (≈1% topical equivalent) | 10000 mcg (10 mg) | 50 units (0.50 mL) |
Administration guidelines: Refer to guidelines | 2.5 mL Reconstitution
Research Supplies Quantity Planner
Scientific mathematical planning of syringes, bacteriostatic water and dry vials needed for extended research blocks using the 50 mg vial.
Peptide Vials (Tripeptide-29, 50 mg each):
- checkReference daily dose 5,000 mcg (≈0.5% topical equivalent, 5 mg/day) ≈ 10 days per 50 mg vial
- check8 weeks ≈ 6 vials (280 mg); 12 weeks ≈ 9 vials (420 mg); 16 weeks ≈ 12 vials (560 mg)
- checkAt a 1% equivalent (10 mg/day) vial use roughly doubles; at 0.1% (1 mg/day) it drops ~5-fold — a reminder this peptide is used topically/orally, not injected
Insulin Syringes (U-100):
- checkOnce-daily model: 7 syringes per week
- check8 weeks ≈ 56 syringes; 12 weeks ≈ 84 syringes; 16 weeks ≈ 112 syringes
- checkReference dose 5,000 mcg = 25 units; doses up to 10,000 mcg (50 units) fit one 1 mL syringe
Bacteriostatic Water (30 mL bottles): Use 2.5 mL per vial for reconstitution.
- check8 weeks (≈6 vials) ≈ 15 mL ≈ 1 bottle
- check12 weeks (≈9 vials) ≈ 22.5 mL ≈ 1 bottle
- check16 weeks (≈12 vials) ≈ 30 mL ≈ 1 bottle
Alcohol Swabs:
- check1-2 swabs per dose (vial top + site)
- check8 weeks ≈ 56-112 swabs; 12 weeks ≈ 84-168 swabs
- check16 weeks ≈ 112-224 swabs; keep extras for re-swabbing the multi-use vial
Mechanism of Action (MOA)
Tripeptide-29 is the cosmetic (INCI) name for a synthetic copy of glycine-proline-hydroxyproline (Gly-Pro-Hyp), a three-residue sequence (molecular weight ≈285 g/mol) that is the single most common repeating motif in the triple helix of type I collagen [1][2]. It works through "matrikine" signaling: when dermal collagen is enzymatically degraded, short Gly-Pro-Hyp and Pro-Hyp fragments are released, and skin fibroblasts treat the appearance of these fragments as a damage signal that calls for repair. Supplying the same sequence from outside is intended to "trick" fibroblasts into upregulating new collagen synthesis [1].\n\nThe downstream biology is fibroblast activation. Collagen-derived peptides have been shown to engage fibroblast signaling and stimulate type I collagen production; in the ingredient manufacturer's in-vitro testing, a 3% Gly-Pro-Hyp solution increased type I collagen synthesis by roughly 400% over 48 hours, and lower 0.1-1% concentrations produced graded increases in collagen output [1]. These data come from cell-culture and test-tube models, not controlled human skin trials, so the magnitude of any topical benefit in vivo remains uncertain [1].\n\nPharmacokinetics depend entirely on route. Topically, Gly-Pro-Hyp is fully water-soluble and small, but the stratum corneum limits dermal penetration; there is no meaningful systemic absorption or "half-life" for a leave-on cosmetic. Orally, Gly-Pro-Hyp is unusual among collagen peptides in surviving digestion: it is partially cleaved at the intestinal brush border by aminopeptidase N to Pro-Hyp and is also absorbed intact, entering blood through the H+-coupled PEPT1 transporter [3]. After ingestion of collagen hydrolysate, hydroxyproline-containing peptides appear in human plasma within about 30-120 minutes, with Pro-Hyp reaching peak concentrations on the order of a few micrograms per millilitre and Gly-Pro-Hyp appearing at lower levels [4][5]. Gly-Pro-Hyp is notably stable in plasma compared with most di- and tripeptides, but circulating peptides are still cleared over a few hours; a formal elimination half-life has not been established for cosmetic or food use [4][5].\n\nFrom the circulation, these collagen-derived peptides distribute to skin, where they are proposed to act as fibroblast signals supporting extracellular-matrix synthesis — the mechanism invoked to explain improvements in skin hydration, elasticity and wrinkling reported in oral collagen-tripeptide trials [6][7]. Importantly, Tripeptide-29 is a cosmetic and food ingredient, not an injectable drug, and has no validated subcutaneous pharmacology. The reconstitution and unit figures on this page are an educational measurement convention used across this site, not a clinically validated delivery route.
Clinical Trial Efficacy Highlights
- starIn-vitro testing summarized in cosmetic-ingredient databases reports that a 3% Gly-Pro-Hyp (Tripeptide-29) solution increased type I collagen synthesis by approximately 400% over 48 hours in cultured cells, with lower 0.1-1% concentrations producing graded increases in collagen output; these results derive from test-tube/cell models only and have not been reproduced in controlled human skin trials [1][2].
- starSontakke and colleagues (2016, Journal of Agricultural and Food Chemistry) characterized Gly-Pro-Hyp as an 'orally available collagen tripeptide,' showing it is enzymatically stable in gastrointestinal fluid, permeates intestinal cell monolayers, and is absorbed both intact and as its Pro-Hyp cleavage product, providing the mechanistic basis for systemic delivery after oral intake [3].
- starTaga and colleagues (2022, npj Science of Food) identified a highly stable bioactive 3-hydroxyproline-containing tripeptide in human blood after collagen hydrolysate ingestion, confirming that defined collagen tripeptides reach the circulation intact and persist long enough to act as signaling molecules [4].
- starVirgilio and colleagues (2024, Frontiers in Nutrition), in a randomized double-blind crossover study of healthy volunteers given a single 10 g collagen hydrolysate dose, found Pro-Hyp was the most abundant circulating peptide (ΔCmax ≈3.8 µg/mL) with Gly-Pro-Hyp present at lower levels, both peaking roughly 60-120 minutes after intake [5].
- starKim and colleagues (2018, Nutrients) randomized 64 adults to 1,000 mg/day low-molecular-weight collagen peptide or placebo for 12 weeks; the active group showed significantly greater skin hydration at 6 and 12 weeks and significant improvements in visual wrinkle score and three wrinkle parameters versus placebo, supporting oral collagen-tripeptide efficacy for skin [6].
- starTak and colleagues (2021, Frontiers in Medicine) gave middle-aged women 1,000 mg/day collagen tripeptide for 12 weeks and found a significantly greater reduction in transepidermal water loss versus control that held after adjusting for humidity, temperature and UVA exposure, although between-group differences in hydration and elasticity did not reach statistical significance [7].
- starAcross the published evidence base, robust randomized data support ORAL collagen tripeptide at roughly 1,000 mg/day, whereas direct human efficacy evidence for TOPICAL Tripeptide-29 remains limited to in-vitro testing; no peer-reviewed randomized controlled trial has yet demonstrated wrinkle or firmness benefit for the topical ingredient specifically [1][6][7].
Side Effects & Tolerability Profile
Clinical subjects transiently report mild side effects. Slowly escalating the titration dose represents the single most effective intervention to limit side effects.
- warningAs a topical cosmetic ingredient, Tripeptide-29 is generally considered well tolerated at 0.1-1%, but like any leave-on active it can occasionally cause mild irritation, redness, stinging or contact dermatitis, particularly on sensitive or compromised skin [1][2].
- warningA patch test on a small area for 24-48 hours is advisable before regular facial use, especially when layering it with retinoids, exfoliating acids or other actives that can increase skin sensitivity.
- warningOral collagen-tripeptide supplements (about 1,000-2,500 mg/day) are usually well tolerated; reported effects are mild and gastrointestinal, including fullness, bloating, mild nausea or an unpleasant aftertaste, with rare hypersensitivity reactions [6][7].
- warningBecause oral collagen tripeptide is often derived from fish, bovine or porcine collagen, people with those allergies should check the source; the cosmetic Tripeptide-29 is typically synthesized without animal-derived material, but formulations vary [1].
- warningThere is no validated injectable use and no safety data for subcutaneous administration; research-grade powders are not sterile pharmaceutical products and carry sterility, endotoxin and contamination risks, so the reconstitution model here must not be used for actual injection.
- warningSafety in pregnancy, breastfeeding and children has not been specifically established for concentrated Tripeptide-29; these populations should consult a clinician before use.
- warningSystemic drug interactions are not expected at cosmetic exposures; theoretically, large oral peptide loads share the PEPT1 transporter with some peptidomimetic drugs, but no clinically significant interactions have been documented [3].
- warningRegulatory/research status: Tripeptide-29 is a cosmetic INCI ingredient and, as collagen tripeptide, a food/supplement ingredient — not an approved drug. It is not FDA- or EMA-approved for any therapeutic indication, individual cosmetic ingredients are not FDA pre-approved, and this page is educational, not medical advice.
Subcutaneous Injection Technique
Most research peptides require subcutaneous injection into fatty tissue. Never inject directly into a blood vessel or deep muscle tissue unless clinically detailed.
1. Site Selection
Common locations include the abdomen (2 inches from navel), outer upper arms, or thighs.
2. Sanitization
Thoroughly clean the selected site, stopper and vial top using 70% isopropyl alcohol prep swabs.
3. Angle & Push
Pinch the skin and insert the needle at a 45 to 90-degree angle. Depress plunger smoothly.
4. Site Rotation
Rotate injection sites continuously to avoid lipodystrophy or tissue scarring.
Frequently Asked Questions
What is the typical Tripeptide-29 dosage?expand_more
Tripeptide-29 dosage is route-dependent. As a topical cosmetic it is used at roughly 0.1-1% by weight in serums and creams, applied once or twice daily; in a ~1 mL (≈1 g) application that delivers about 1-10 mg of the peptide to the skin. As an oral collagen tripeptide it is typically taken at about 1,000-2,500 mg/day, with 1,000 mg/day being the dose used in most randomized skin trials [6][7]. It is not dosed by injection; the subcutaneous units on this page (1,000 mcg = 5 units, 5,000 mcg = 25 units, 10,000 mcg = 50 units at 20 mg/mL) are an educational measurement reference only.
Is Tripeptide-29 FDA approved?expand_more
No. Tripeptide-29 is not an FDA-approved drug. It is a cosmetic ingredient (INCI name Tripeptide-29) and, in its oral form, a food/dietary-supplement ingredient (collagen tripeptide). The FDA does not pre-approve individual cosmetic ingredients, and oral collagen peptides are sold as supplements rather than approved medicines. There is no EMA drug approval either. The information here is educational and not medical advice.
What is the half-life of Tripeptide-29?expand_more
There is no formally established half-life. For topical use there is essentially no systemic absorption, so a plasma half-life does not apply. When the related collagen tripeptide is taken orally, Gly-Pro-Hyp and its Pro-Hyp metabolite appear in blood within about 30-120 minutes and are cleared over a few hours; Gly-Pro-Hyp is unusually stable in plasma for a tripeptide but is still degraded relatively quickly [3][4][5].
How do you reconstitute and apply Tripeptide-29?expand_more
In real-world use you do not reconstitute it for injection: it is added to a water-based serum or cream at 0.1-1% (it is 100% water-soluble) or taken orally as a powder or capsule. For the educational subcutaneous model on this site, a 50 mg vial is mixed with 2.5 mL of bacteriostatic water to give 20 mg/mL (200 mcg per insulin-syringe unit); draw the water down the vial wall, swirl gently until clear, and refrigerate. This measurement model is not a recommendation to inject the compound.
Can Tripeptide-29 be stacked with retinol or other peptides?expand_more
In cosmetic formulations Tripeptide-29 is commonly layered with retinol, vitamin C, niacinamide, hyaluronic acid and other signal peptides (such as Matrixyl/palmitoyl peptides), and being water-soluble and pH-tolerant it generally plays well in multi-active routines [1]. Because retinoids and acids can increase irritation, introduce one new active at a time and patch test first. There is no controlled human study of these specific topical combinations, so stacking benefits are theoretical; oral collagen tripeptide is similarly often paired with vitamin C as a collagen-synthesis cofactor.
Related Guides & Tools
Step-by-step references for reconstituting, measuring, and storing Tripeptide-29, plus the universal dosing calculator.
Academic References & Study Citations
INCI Decoder. 'Tripeptide-29 (Explained + Products).' Cosmetic ingredient profile: synthetic glycine-proline-hydroxyproline (Gly-Pro-Hyp); matrikine collagen-signaling mechanism; in-vitro 3% solution increased type I collagen synthesis ~400% at 48 h (in-vitro data only). View Scientific Paper →
COSMILE Europe. 'Tripeptide-29 – Ingredient.' INCI identity and skin-conditioning function of the synthetic glycine/proline/hydroxyproline peptide. View Scientific Paper →
Sontakke SB, Jung JH, Piao Z, Chung HJ. (2016) J Agric Food Chem 64(38):7127-7133. 'Orally Available Collagen Tripeptide: Enzymatic Stability, Intestinal Permeability, and Absorption of Gly-Pro-Hyp and Pro-Hyp.' PMID 27573716. View Scientific Paper →
Taga Y, Iwasaki Y, Tometsuka C, Funato N, Shigemura Y, Kusubata M. (2022) npj Sci Food 6(1):29. 'Identification of a highly stable bioactive 3-hydroxyproline-containing tripeptide in human blood after collagen hydrolysate ingestion.' PMID 35662250. View Scientific Paper →
Virgilio N, Schön C, Mödinger Y, van der Steen B, Vleminckx S, van Holthoon FL, et al. (2024) Front Nutr 11:1416643. 'Absorption of bioactive peptides following collagen hydrolysate intake: a randomized, double-blind crossover study in healthy individuals.' PMID 39149544. View Scientific Paper →
Kim DU, Chung HC, Choi J, Sakai Y, Lee BY. (2018) Nutrients 10(7):826. 'Oral Intake of Low-Molecular-Weight Collagen Peptide Improves Hydration, Elasticity, and Wrinkling in Human Skin: A Randomized, Double-Blind, Placebo-Controlled Study.' PMID 29949889. View Scientific Paper →
Tak YJ, et al. (2021) Front Med (Lausanne) 7:608903. 'Effect of Collagen Tripeptide and Adjusting for Climate Change on Skin Hydration in Middle-Aged Women: A Randomized, Double-Blind, Placebo-Controlled Trial.' View Scientific Paper →