Primopex 100 from Sixpex is an injectable anabolic steroid. Each 10ml vial holds Methenolone Enanthate (Primobolan) at 100mg per ml.

What It Is
Methenolone Enanthate (C27H42O3) is a long-acting DHT-based steroid, built for slow release. It’s got a double bond at C1-C2 and a 1-methyl group, so your liver won’t break it down easily. It’s mild—an anabolic:androgenic ratio around 88:44-57. No estrogen conversion, so you won’t puff up. It uses grapeseed oil as the carrier, and sticks around—half-life is 7 to 10 days, and you’ll test positive for about a month after stopping.

What It’s Used For
Doctors use Methenolone Enanthate for stuff like muscle wasting, anemia, or even osteoporosis. In bodybuilding, it’s a go-to for lean bulking or cutting—keeps your muscle when calories drop and helps you look more defined without extra water. New users like it because it’s gentle, and it works well with other compounds. For mass, stack it with Testosterone. For contest prep, people throw in Winstrol or Trenbolone. 

Why People Like It
You get steady, quality muscle gains—usually 8 to 12 pounds per cycle—without a lot of fat or water. It keeps nitrogen in your muscles, boosts strength, and even drops SHBG, so you have more free testosterone. It’s easy on your system compared to other injectables—no estrogen side effects, low liver stress, and most women can use it at lower doses. It even gives your immune system a little kick and doesn’t shut you down as hard as other steroids.

Downsides and Side Effects
You might see mild acne or some hair loss (blame DHT), and your cholesterol can take a hit—mainly, lower HDL. Joints might feel dry. Bigger risks? It does suppress your natural testosterone, and some people get a weird cough after injecting. It isn’t cheap, and fakes are everywhere. Also, it takes a few weeks to really feel the effects, and the gains are slower and less dramatic than harsher steroids.

How to Use It
Men usually run 400 to 800mg a week, split into two shots (glutes or quads, 23-25G needle). If you’re just starting, 400mg is enough. Women stick to 50-100mg weekly. Most cycles last 10 to 16 weeks, and it’s smart to add a base of Testosterone. After the cycle, start PCT two weeks later—Clomid at 50/50/25/25 mg. Don’t forget to check your bloodwork, especially lipids.

Different Ways to Run It
Solo lean bulk: 600mg per week, with 0.5mg Arimidex every other day.
Cutting stack: 400mg Primo, 300mg Test Prop, 50mg Winstrol daily, weeks 1-12.
Bridging: 200-300mg per week between heavy cycles.
Women: 100mg per week on its own.