Intex TE-300

What Is Testosterone Enanthate 300mg?

Testosterone Enanthate is the most widely used injectable testosterone ester in the world and has been the foundation of hormone replacement and performance protocols since its introduction in the 1950s. Intex Pharma TE-300 delivers 300mg of Testosterone Enanthate per millilitre in a 10ml multi-use vial, giving you 3,000mg of pharmaceutical-grade Testosterone Enanthate per vial. Whether you are running your first testosterone cycle, managing long-term TRT or building an advanced stack, Testosterone Enanthate 300mg is the compound most UK users start with and the one most never stop using.

The enanthate ester is a seven-carbon chain attached to the testosterone molecule at the 17-beta hydroxyl position. This ester controls how slowly the hormone is released from the oil depot after intramuscular injection, giving Testosterone Enanthate a half-life of approximately 4.5 days. In practical terms, this means stable blood levels can be maintained with injections every 3.5 to 5 days, making Testosterone Enanthate one of the most convenient and user-friendly injectable steroids available in the UK.

Testosterone Enanthate is chemically identical to the testosterone your body produces naturally. The only difference is the delivery mechanism. Once the enanthate ester is cleaved by esterase enzymes in the bloodstream, what remains is pure testosterone, binding to androgen receptors in skeletal muscle, bone, brain and every other androgen-responsive tissue in the body. This is why Testosterone Enanthate remains the gold standard: it is not a synthetic derivative. It is the actual hormone, delivered in a controlled-release format.

Why Choose Intex Pharma Testosterone Enanthate TE-300

The UK underground lab market is flooded with testosterone products that are underdosed, contaminated or filled with the wrong ester entirely. Intex Pharma exists to solve that problem. Every batch of Intex Pharma Testosterone Enanthate 300mg is independently tested by Janoshik Analytical, one of the only third-party laboratories in the world that routinely tests underground lab products. The Certificate of Analysis for your batch is available in the product gallery on this page, and you can read the full guide on how to interpret a COA here.

Intex Pharma TE-300 is dosed at 300mg/ml, which is higher than the standard 250mg/ml concentration most UK labs offer. This means fewer injections for the same weekly dose, less oil volume per pin and better value per milligram. At £41.00 per 10ml vial, you are getting 3,000mg of verified Testosterone Enanthate, enough for a full 12-week TRT protocol or a significant portion of a performance cycle.

Testosterone Enanthate Pharmacokinetics: Half-Life and Release Profile

Understanding how Testosterone Enanthate behaves in the body is essential for designing an effective injection protocol. The enanthate ester gives the compound a terminal half-life of approximately 4.5 days, which means that roughly half of the injected dose has been released from the oil depot and cleared from the bloodstream by day four or five after injection. This pharmacokinetic profile was established in early clinical studies and has been confirmed repeatedly in more recent work, including Behre et al. (1999) published in the Journal of Clinical Endocrinology and Metabolism.

After intramuscular injection of Testosterone Enanthate, serum testosterone levels rise over the first 24 to 48 hours, reaching a peak typically between day one and day three. From that peak, levels decline in a predictable curve governed by the ester cleavage rate. For users injecting once per week, this creates a peak-to-trough ratio that some individuals notice as fluctuations in mood, energy and libido towards the end of the injection window. Splitting the weekly dose into two injections every 3.5 days significantly flattens this curve, reducing oestradiol spikes and delivering more stable blood levels throughout the week.

At 300mg/ml, Intex Pharma Testosterone Enanthate allows precise dosing with smaller injection volumes. A user running 300mg per week needs just 1ml of oil. A TRT user running 150mg per week needs only 0.5ml. This is a meaningful practical advantage over 250mg/ml products, where the same doses require 1.2ml and 0.6ml respectively. Less oil means less post-injection soreness, smaller injection sites and faster absorption. For a detailed guide on managing injection frequency to avoid testosterone troughs, see our guide on testosterone crash between injections.

Testosterone Enanthate Dosing Guide: TRT Through to Advanced Cycles

Dosing Testosterone Enanthate depends entirely on your goals. The table below covers the four most common use cases for Testosterone Enanthate 300mg in the UK, from clinical TRT replacement through to experienced performance dosing. All weekly doses assume Intex Pharma TE-300 at 300mg/ml.

For first-time users, 300mg of Testosterone Enanthate per week is the most commonly recommended starting dose. This provides a meaningful supraphysiological stimulus without creating unmanageable oestradiol conversion in most individuals. At this dose from a single vial of TE-300, one vial covers a full 10-week cycle with room to spare. For a complete first-cycle walkthrough, see the Intex Pharma beginner cycle guide for 2026.

Users stepping up to intermediate dosing will typically run Testosterone Enanthate at 450 to 600mg per week, often stacking with a second compound such as Masteron Enanthate for a cutting phase or Nandrolone Decanoate for a bulk. At these doses, two vials of Intex Pharma TE-300 will comfortably cover a 12-week cycle.

Testosterone Enanthate vs Testosterone Cypionate: What Actually Differs

This is one of the most searched questions in UK bodybuilding, and the answer is simpler than most sources make it. Testosterone Enanthate has a seven-carbon ester chain. Testosterone Cypionate has an eight-carbon ester chain. That single extra carbon gives Cypionate a marginally longer half-life (approximately 5 days vs 4.5 days for Enanthate), but the practical difference in blood level stability is negligible. Both esters release the same hormone. Both are injected on the same schedule. Both aromatise at the same rate milligram for milligram of active testosterone.

The historical difference is geographical. Testosterone Enanthate (as Testoviron) has been the dominant ester in Europe and the UK for decades. Testosterone Cypionate (as Depo-Testosterone) has been the standard in the United States. Both are interchangeable in practice. If you are already using Intex Pharma T400, you are already receiving 120mg of Testosterone Enanthate alongside 120mg of Testosterone Cypionate and 160mg of Testosterone Decanoate in every millilitre.

Oestrogen Management on Testosterone Enanthate

Testosterone Enanthate aromatises. Every milligram of testosterone that enters the bloodstream is a potential substrate for the aromatase enzyme, which converts testosterone into oestradiol. This is not a defect of the compound. It is normal physiology. Oestradiol is essential for bone density, cardiovascular function, cognitive performance and joint health. The goal is not to eliminate oestradiol but to keep it in a range where the user feels well and avoids oestrogen-related side effects such as water retention, elevated blood pressure and gynaecomastia.

At TRT doses of 100 to 150mg per week, most users will not need an aromatase inhibitor. Oestradiol typically stays within a manageable range because the testosterone dose is close to natural production levels. At performance doses of 300mg per week and above, some users will experience oestradiol levels that exceed their individual comfort threshold. The key word is individual. Two users on identical doses of Testosterone Enanthate can have wildly different oestradiol levels because aromatase expression varies with body fat percentage, age, genetics and SHBG levels.

The only reliable way to manage oestrogen on Testosterone Enanthate is with bloodwork. Testing oestradiol using the sensitive LC-MS/MS assay (not the standard immunoassay, which is unreliable in males) gives you an accurate number to act on. For a detailed breakdown of how to read your oestradiol results, see our oestradiol bloodwork guide. If AI is needed, Anastrozole at 0.25 to 0.5mg on injection days is the standard starting point, titrated by bloodwork rather than symptoms alone.

Testosterone Enanthate Side Effects and Risk Management

Testosterone Enanthate is one of the best-tolerated anabolic compounds available, but it is not without risks. The side effect profile of Testosterone Enanthate is dose-dependent: the higher the dose, the more pronounced the androgenic and oestrogenic effects. Understanding what to expect and how to manage each side effect is what separates responsible use from reckless use.

Haematocrit elevation is one of the most under-discussed risks of long-term Testosterone Enanthate use. Testosterone stimulates erythropoietin production in the kidneys, increasing red blood cell mass. This can raise haematocrit above the safe threshold of 54%, increasing blood viscosity and cardiovascular risk. Every user of Testosterone Enanthate should monitor haematocrit with a full blood count at least every 12 weeks. For a complete breakdown, see our haematocrit management guide for steroid users.

Testicular atrophy is an inevitable consequence of exogenous testosterone use. When the hypothalamus detects supraphysiological testosterone levels, it suppresses GnRH, which suppresses LH and FSH from the pituitary, which in turn stops the testes from producing testosterone and spermatogenesis slows or halts. Running HCG at 250 to 500IU twice weekly throughout a Testosterone Enanthate cycle maintains intratesticular testosterone, preserves Leydig cell function and makes post-cycle recovery significantly easier.

Essential Bloodwork for Testosterone Enanthate Users

Bloodwork is not optional on Testosterone Enanthate. It is the only way to know whether your dose is appropriate, whether your oestradiol is managed, whether your haematocrit is safe and whether your liver and kidneys are coping. Before starting any Testosterone Enanthate cycle, you should run a full baseline panel. See our pre-cycle bloodwork guide for exactly what to test and why.

Timing your bloodwork correctly on Testosterone Enanthate matters more than most users realise. If you inject every 3.5 days, your trough blood draw should be taken on the morning of your next injection, before pinning. This gives you the lowest point in your cycle, which is the clinically useful measurement for dose adjustment. Testing at peak (day one or two after injection) gives you an artificially high number that does not represent your average serum level. For the full timing protocol, see our testosterone bloodwork interpretation guide.

PCT After a Testosterone Enanthate Cycle

Post-cycle therapy after Testosterone Enanthate should not begin until the compound has cleared your system. Based on the 4.5-day half-life of Testosterone Enanthate, approximately five half-lives (22 to 23 days) are needed for full clearance. In practice, most protocols recommend starting PCT 14 to 18 days after the last Testosterone Enanthate injection, which allows levels to drop to a point where the SERMs can effectively stimulate the HPTA without competing against residual exogenous testosterone.

If you ran HCG throughout your Testosterone Enanthate cycle (as recommended), your Leydig cells will still be functional and responsive to LH when PCT begins. This makes recovery faster and more complete. If you did not run HCG on cycle, a two-week HCG bridge of 1,000 to 1,500IU every other day before starting your SERM can help restore testicular responsiveness before the SERM attempts to drive LH production.

The standard PCT protocol after a Testosterone Enanthate cycle is Nolvadex (Tamoxifen) at 20mg daily for four to six weeks, or Clomid (Clomiphene) at 25 to 50mg daily for the same period. For a full breakdown of PCT sequencing, including how to decide between Nolvadex and Clomid, see the Intex Pharma PCT guide and the Nolvadex vs Clomid sequencing guide. To monitor your recovery, check LH and FSH levels four to six weeks after completing PCT.

Stacking Testosterone Enanthate with Other Compounds

Testosterone Enanthate is the most versatile base compound in any stack. It can be combined with virtually any other anabolic steroid, serving as the testosterone foundation that maintains physiological androgen levels while the secondary compound drives the specific adaptation you are targeting. The principle is simple: Testosterone Enanthate handles your baseline hormonal needs, and the stacked compound handles the specialised goal.

For bulking, Testosterone Enanthate pairs naturally with Nandrolone Decanoate (Deca). Both are long-ester injectables that can be pinned on the same schedule. The combination of Testosterone Enanthate at 400 to 500mg per week alongside Nandrolone Decanoate at 300 to 400mg per week is one of the oldest and most proven mass-building stacks in bodybuilding. Managing prolactin with Cabergoline when running 19-nor compounds alongside Testosterone Enanthate is essential.

For cutting, Testosterone Enanthate at a moderate dose of 200 to 300mg per week alongside Masteron Enanthate at 300 to 400mg per week provides a dry, hard aesthetic with manageable side effects. Masteron’s anti-oestrogenic properties at the receptor level can reduce the need for an AI when Testosterone Enanthate doses are kept moderate.

For users who want a simple, effective approach without adding a second injectable, Testosterone Enanthate at 300 to 500mg per week paired with Anavar (Oxandrolone) at 40 to 60mg daily for the final six to eight weeks of the cycle adds a strength and hardness component with relatively low hepatotoxicity compared to other orals.

Cycle Support: What to Run Alongside Testosterone Enanthate

Running Testosterone Enanthate responsibly means having the right ancillaries in place before the first injection. These are not optional extras. They are part of the protocol.

Storage and Handling of Testosterone Enanthate 300mg

Intex Pharma Testosterone Enanthate TE-300 should be stored at room temperature, between 15 and 25°C, away from direct sunlight and moisture. Do not refrigerate or freeze injectable testosterone. The carrier oil can crystallise at low temperatures, which does not damage the compound but requires rewarming before use. If the oil appears cloudy or has visible crystals, place the vial in warm (not hot) water for five to ten minutes until the solution is clear and uniform before drawing.

After puncturing the rubber stopper, the vial remains usable for 28 days when stored correctly. Always swab the stopper with an alcohol wipe before each draw. Use a drawing needle (typically 18 to 21 gauge) to pull the oil from the vial, then switch to a fresh injection needle (typically 25 to 27 gauge for intramuscular) before pinning. Never inject with the same needle used to draw.

Buying Testosterone Enanthate in the UK: What to Know

Testosterone Enanthate is a Class C controlled substance in the United Kingdom under the Misuse of Drugs Act 1971. It is legal to possess for personal use. It is not legal to supply, distribute or import with intent to supply. Purchasing Testosterone Enanthate from a UK-based source for personal use is the most straightforward legal position. Intex Pharma ships all orders from within the UK with same-day despatch and discreet packaging.

The biggest risk when buying Testosterone Enanthate in the UK is not legal. It is quality. The underground market is saturated with underdosed, mislabelled and contaminated products. A vial labelled “Testosterone Enanthate 300mg/ml” might contain 180mg/ml, or it might contain a cheaper ester, or it might not contain testosterone at all. This is exactly why third-party testing matters. Every batch of Intex Pharma TE-300 carries a Janoshik Certificate of Analysis that you can verify. Read our full breakdown of whether Intex Pharma is legit and check verified customer reviews.

Testosterone Enanthate 300mg: Cost Per Cycle

At £41.00 per vial, Intex Pharma Testosterone Enanthate TE-300 is one of the most cost-effective verified testosterone products available in the UK. Here is what the real cost looks like across common protocol lengths.

First-time buyers can use code WELCOME20 for 20% off orders over £200. Bitcoin users receive 15% off sitewide with code INTEXBTC15. Both codes apply to Testosterone Enanthate TE-300 and all other Intex Pharma products.

Testosterone Enanthate 300mg: Frequently Asked Questions