Name: Tetrapeptide-21 Powder - China Tetrapeptide-21 Powder Manufacturers Suppliers Factory - Medibridge
Brand: Medibridge
SKU: 299526003

Description

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Tetrapeptide-21 powder is a synthetic cosmetic peptide with the short sequence Gly-Glu-Lys-Gly, also written as GEKG. It is made by peptide synthesis, then purified and dried into a fine white to off-white powder. Compared with long peptide chains, this four-amino-acid structure is simple, light in molecular weight, and easy to define by HPLC and LC-MS testing.

In cosmetic formulation work, this GEKG peptide is mainly used in anti-aging, firming, eye care, and wrinkle-care product lines. It is often selected for formulas that focus on smoother skin texture, better-looking firmness, and multi-peptide skin care concepts. Its water solubility also makes it practical for aqueous systems, serums, creams, and other leave-on cosmetic products.

Shaanxi Medibridge Biotech Co., Ltd. supplies this cosmetic peptide raw material in bulk powder or vial form, with purity testing, batch COA, and custom packing support. We can also provide flexible vial size, mg-per-vial filling, private label service, and repeat-batch supply for cosmetic brands, raw material distributors, and formulation labs.


Product Name	CAS Number	Batch Number
Tetrapeptide-21 Powder	960608-17-7	MB2601281030
Manufacturer Date	Analysis Date	Expiry Date
2026-01-28	2026-01-29	2028-01-27
Sample Qty Base	Packing	Test Method
400KGS	25kg/drum	HPLC

Item	Standard	Results
Appearance	White to off-white lyophilized powder	Conforms
Identification (HPLC)	Retention time consistent with reference standard	Conforms
Peptide Sequence	Gly-Glu-Lys-Gly (GEKG)	Conforms
Molecular Formula	C15H27N5O7	Conforms
Molecular Weight	389.4	Conforms
Purity (HPLC)	NLT 98.0%	98.69%
Solubility	Soluble in water	Conforms
Water Content (Karl Fischer)	NMT 5.0%	2.28%
Acetate Content	NMT 12.0%	6.22%
Heavy Metals	NMT 10 ppm	Conforms
Related Substances	NMT 2.0%	Conforms
Storage	Store in cool & dry place. keep away from strong light and heat
Conclusion	The batch conforms to the IN-HOUSE standard

Tetrapeptide-21 has a four-amino-acid sequence: Gly-Glu-Lys-Gly, usually shortened as GEKG. It is a small structure, but not a blank chain. The two glycine residues keep the peptide light and flexible. Glutamic acid brings an acidic side group, while lysine adds a basic side group. This gives the sequence a simple mixed-charge character, which fits well with cosmetic peptide formulation work.

Its molecular weight is about 389.4, so it belongs to the low-molecular-weight peptide group. For a cosmetic raw material, this makes the specification easier to define by sequence, purity, molecular weight, appearance, and solubility. The short GEKG structure is also practical in multi-peptide systems, where formulators often prefer clean, simple peptide materials instead of large or unclear protein fragments.

This peptide is mainly positioned as a cosmetic raw material, not a broad laboratory research peptide. Its value is usually discussed around skin care formulas, especially products made for aging care, skin texture, firmness, and fine-line appearance. That is why the page should stay close to formulation language instead of animal models, disease studies, or clinical-style claims.

For product development, the GEKG peptide is more often seen in serums, creams, eye care products, and multi-peptide blends. It works as one part of a cosmetic active system, together with humectants, emollients, botanical extracts, vitamins, or other peptides. The raw powder form gives brands and labs more room to adjust concentration, solvent system, and final product format during formula design.

Some cosmetic peptide materials are sold as ready-made liquid blends, often mixed with water, glycerin, butylene glycol, or other carriers. This product is supplied as raw powder, so the focus is different. The powder form gives more flexibility for brands, labs, and ingredient distributors who need their own concentration, solvent system, or finished formula design.

For raw peptide powder, the key information is not only the marketing name. Purity, sequence, molecular weight, solubility, moisture level, and batch documents all matter in real supply work. A clear powder specification also makes it easier to arrange bulk purchase, vial filling, sample preparation, and repeat orders under the same quality standard.

This format is especially suitable when the peptide will be used in custom cosmetic formulas, multi-peptide blends, or private-label projects. It can be packed as bulk powder, small vials, or custom mg-per-vial formats according to the order plan.

The GEKG peptide is often used in formulas built around a firmer skin look. It fits well in creams, lotions, and leave-on products where the formula already contains moisturizers, emollients, and other skin-conditioning ingredients.

For wrinkle-care formulas, this short peptide can be used as part of a broader anti-aging system. It is usually paired with hydrating agents, barrier-support ingredients, or other cosmetic peptides to help create a smoother skin feel and a more refined surface appearance.

Eye care formulas often need mild, low-use-level active ingredients with good compatibility. This peptide is suitable for eye serums, eye creams, and lightweight gels where brands want a clean peptide story without making the formula feel heavy.

It can also be used in multi-peptide concepts. In this type of formula, each peptide has its own role, while the whole system focuses on skin texture, firmness, and aging-care positioning. The small GEKG structure makes it easy to place alongside other cosmetic peptide raw materials.

This peptide is water soluble and can fit into aqueous cosmetic systems such as serums, gels, lotions, and light creams. In most cosmetic development work, the powder form is handled as an active raw material first, then adjusted into the final formula according to the target concentration and product type.

Because it is a short peptide material, high heat and long exposure to moisture are usually avoided during processing and storage. Cooling-stage addition is commonly used in peptide formulas, especially when the base contains emulsifiers, humectants, botanical extracts, or other sensitive active ingredients.

For finished products, the final pH, preservative system, and overall formula compatibility still need to match the full ingredient system. This is also why clear batch data matters for Tetrapeptide-21 powder supply, including HPLC purity, LC-MS identification, appearance, solubility, and moisture control.

For a small GEKG peptide, quality is usually shown through a few clear test points. HPLC purity gives the main purity profile. LC-MS confirms whether the molecular weight matches the target sequence. Appearance, solubility, moisture, and residual solvent data help show whether the batch is suitable for cosmetic raw material use.

Since this peptide has only four amino acids, the specification does not need to be complicated, but it does need to be clean and traceable. A stable batch record, clear COA, and repeatable purity standard are more useful than broad wording on the label.

For bulk powder or vial filling orders, we can provide batch documents such as COA, HPLC report, MSDS, and basic specification sheet. Custom purity, packing size, and mg-per-vial formats can also be arranged according to the order plan.

Tetrapeptide-21 powder is usually packed in sealed vials, bottles, or aluminum foil bags, depending on order size and filling format. For small trial orders, vial packing is more common. For bulk supply, double-layer sealed packaging can be used to reduce moisture contact during storage and shipment.

This peptide raw material should be kept sealed, dry, and protected from strong light. For long-term holding, low-temperature storage is recommended. After opening, repeated exposure to air and moisture should be reduced, especially when the material will be used for cosmetic formulation testing or repeat batch work.

For international shipping, we can arrange suitable packing based on quantity, season, and destination. Sample orders, bulk powder, and custom vial orders can be shipped with product label, batch number, net weight, storage note, and related documents such as COA or MSDS.