Zyvex Pharmaceuticals Sustanon 250 Test Blend in a 10 ml Vial
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Injection · 100 mg/ml · 10 ml
Zyvex Pharmaceuticals Primobolan is methenolone enanthate, the mild DHT-derived injectable that does not aromatise, in two concentrations for long, careful blocks. Available for purchase in the following variants: Primobolan 100 and Primobolan 200.
Supplied in sealed 10 ml vials. GMP-manufactured, each batch HPLC-verified with the Certificate of Analysis on file. Primobolan vials for sale with international shipping with a 4 to 10 day transit window.
Zyvex Pharmaceuticals Primobolan is methenolone enanthate at 100 mg/ml and 200 mg/ml in 10 ml multi-dose vials. Buy primobolan if you want the gentlest of the injectables: the compound is a moderate anabolic with weak androgenic activity, it does not aromatise, and it is usually chosen for a long, slow recomposition rather than a fast size push. Every vial is GMP-manufactured and HPLC-verified, with a Certificate of Analysis held for the batch.
Methenolone enanthate is a DHT-derived androgen with a half-life of about ten and a half days, the longest of the methenolone esters, and its effects accumulate slowly over a block measured in months. It cannot become estradiol, so water retention is not part of the picture and no aromatase inhibitor is needed for it. It is still suppressive: the source file records anti-gonadotropic activity, so natural testosterone production falls and a recovery plan is required. The oral acetate form was once used in anemia and has been discontinued in most countries, which leaves the injectable as a research material.
Both vials carry the same enanthate ester; only the concentration and the injected volume differ.
| Formulation | Concentration | Half-Life | Inj. Frequency | Typical Use |
|---|---|---|---|---|
| Methenolone Enanthate 100 | 100 mg/ml | About 10.5 days | Twice a week | Gradual, precise dosing |
| Methenolone Enanthate 200 | 200 mg/ml | About 10.5 days | Twice a week, less oil | Weekly totals in half the volume |
The 100 mg/ml vial makes a low, careful weekly total easy to measure and is the usual starting point for someone who wants to see how the compound feels before committing to a long block. The 200 mg/ml vial halves the oil for the same milligrams, which is convenient once the total climbs and is often paired with a testosterone base from the Zyvex Testosterone line or a harder DHT compound such as the Zyvex Masteron vials. Methenolone has a reputation for being expensive and frequently counterfeited, so the sealed vial and the batch COA matter more here than with most products.
Each batch is produced under GMP conditions and tested by third-party HPLC, with the Certificate of Analysis held for the batch. Store the vials upright at room temperature, away from light, heat and moisture, and inspect for cloudiness before drawing from a 200 mg/ml vial.
For laboratory research only. Consult a healthcare professional before use.
| Brand | Zyvex Pharmaceuticals |
| Active Substance | Methenolone enanthate |
| Formulations | Primobolan 100, Primobolan 200 |
| Concentration | 100-200 mg/ml |
| Form | Injectable, oil-based |
| Vial Size | 10 ml multi-dose |
| Administration | Intramuscular injection |
| Drug Class | Injectable DHT-derived anabolic androgenic steroid |
| Manufacturing | GMP-certified |
| Testing | Third-party HPLC per batch |
| Storage | Room temperature, away from light, heat and moisture |
| Shipping | International, 4-10 days transit |
Consult a healthcare professional before any cycle. Dose figures are common community protocols.
Before you ask
It is methenolone enanthate from Zyvex Pharmaceuticals in 100 mg/ml and 200 mg/ml vials. Methenolone is a DHT-derived androgen with moderate anabolic and weak androgenic activity, and it does not aromatise, which is why it is chosen for slow recomposition rather than fast size. The oral acetate form was formerly used in anemia and has been discontinued in most countries; the injectable is supplied here as laboratory research material.
Same ester, same hormone, different concentration. The 100 mg/ml vial is easier to measure when the weekly total is deliberately low, which is how most users start with methenolone. The 200 mg/ml vial delivers the same milligrams in half the oil, so it is the practical choice once the total climbs or when primo sits beside another injectable. A concentrated oil is thicker, so the injection site can be more noticeable.
About ten and a half days after intramuscular injection, the longest benchmark among methenolone esters in the source file checked for this card. That is long enough for twice weekly dosing and long enough that the compound keeps working after the last injection, which is why blocks run twelve weeks or more and why a recovery plan has to wait for clearance before it begins.
Methenolone is often described as the mildest injectable, and at low totals the reports are mostly limited to injection-site discomfort and the usual androgen themes. It is not harmless: natural testosterone production is suppressed because the compound has anti-gonadotropic activity, so recovery is mandatory, and because it is DHT-derived, hair and prostate concerns still apply to users who are prone to them. Bloodwork is the only individual measure.
The sources do not agree. The fact file checked for this card notes that metabolites clear over weeks and that newer long-term metabolites stretch the window to roughly seventeen days and beyond, while another reference in the same file puts primobolan at up to five weeks. Both numbers are reported here as a disagreement rather than a fact, and anyone subject to testing should not plan around either.
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