TESTOPLEX – C300 300 mg 10 ml XT Labs USA

Product Overview

TESTOPLEX – C300 300 mg 10 ml XT Labs USA is a high-strength injectable Testosterone Cypionate formulation presented in a 10 ml multi-dose vial at 300 mg/ml. As a long-acting testosterone ester, it is intended for informed adult buyers who understand ester-based hormone profiles and prefer concentrated solutions for reduced injection volume. The product is positioned as a commercially available option within the performance and research market, combining established hormone chemistry with the convenience of domestic US supply.​

Brand & Manufacturer Information

XT Labs is an underground manufacturer with strong presence in the USA domestic market, offering a full line of injectable and oral anabolic products, including single-ester testosterones and blends. The brand emphasizes consistent dosing, clear labeling, and recognizable packaging, often including verification features to support authenticity checks by experienced users. XT Labs’ Testoplex series (P100, E300, C300) is marketed as a core range of testosterone products, making C300 the long-ester, high-concentration cypionate entry in that lineup.​

Active Compound Information

TESTOPLEX – C300 contains Testosterone Cypionate, an injectable anabolic-androgenic steroid in which testosterone is esterified with the cypionate (cyclopentylpropionate) chain. Testosterone Cypionate has a typical active half-life of about 7–8 days, providing a slow and sustained release from the intramuscular depot site. The base hormone, testosterone (C27H40O3), is the primary male androgen responsible for development and maintenance of male secondary sexual characteristics and is widely used as a reference compound in the AAS class.​

Product Specifications

TESTOPLEX – C300 300 mg 10 ml XT Labs USA is supplied as:​

• Concentration: 300 mg Testosterone Cypionate per ml

• Volume: 10 ml multi-dose vial (total 3000 mg per vial)

• Form: Oil-based injectable solution for intramuscular use

• Active half-life (reference): approximately 7–8 days for testosterone cypionate​
  The vial typically uses an oil carrier suitable for depot injection, with crimped aluminium cap and rubber stopper to allow multi-use access under appropriate sterile technique. The label usually states product name, active ingredient, concentration, batch/lot number, and expiry date in line with standard UGL practice.​

Quality Control & Testing Standards

XT Labs describes TESTOPLEX – C300 as an injectable product intended for intramuscular administration, with the active substance being the oil‑soluble 17β‑cyclopentylpropionate ester of testosterone. Vendor materials emphasize consistent concentration and stability across batches, and some retailers highlight third‑party verifications or lab testing summaries for testosterone cypionate lines in general. As with most underground products, the quality assurance model is based on internal assays and market feedback rather than formal regulatory approval, so informed buyers often rely on trusted domestic suppliers and repeat-batch experience.​

Intended Use & Market Positioning

Within the XT Labs catalogue, TESTOPLEX – C300 is positioned as a high‑strength, long‑acting testosterone cypionate option for experienced adult consumers, researchers, and collection-focused buyers. The 300 mg/ml concentration is marketed towards those looking to minimize injection volume versus standard 200–250 mg/ml offerings, while still using a familiar, single-ester testosterone backbone. Retailers typically present it as suitable for advanced users who understand the implications of concentrated formulations, rather than as an introductory product.​

Packaging, Storage & Handling

TESTOPLEX – C300 is commonly shipped in discreet outer packaging from domestic US warehouses to reduce transit times and enhance privacy. The vial itself is a standard 10 ml glass container with printed or stickered label and crimped cap over a rubber stopper, compatible with standard intramuscular injection equipment. Vendors recommend storing the vial in a cool, dry place away from direct light and heat, typically at room temperature, and avoiding freezing or excessive temperatures that can affect oil viscosity or stability.​

Purchasing & Availability Information

TESTOPLEX – C300 300 mg 10 ml XT Labs USA is widely listed by US‑domestic steroid retailers, often marketed with fast shipping and the ability to pay via card, crypto, or other secure methods. Product pages usually highlight that it is shipped from inside the USA to reduce customs risk and lead times for American buyers. Many vendors also bundle it with other XT Labs products or offer loyalty discounts and bulk pricing for repeat or higher‑volume customers.​

Legal & Regulatory Disclaimer

Testosterone Cypionate is a controlled substance in many jurisdictions and is regulated as a prescription‑only medicine or controlled drug. Buyers are responsible for understanding and complying with all applicable local, state, federal, and international laws regarding the purchase, possession, and use of such compounds. Product listings for TESTOPLEX – C300 typically state that items are sold for research, informational, or collection purposes only and that no medical advice, dosing guidance, or performance guarantees are provided; any use outside lawful, supervised contexts remains the sole responsibility of the end user.​