Product Overview
OmniMass is Xeno Laboratories' mass-oriented testosterone mix: one 10 ml oil vial declaring 500 mg per millilitre of blended esters. It is built for the part of a cycle where calories are already above maintenance and the goal is raw size, so the practical questions are weekly total, injection rhythm and how much estradiol control the run needs.
As with every multi-ester product, the label discloses the combined strength only. The supplier does not publish how the 500 mg is divided between esters, and no independent assay of this vial is available, so the figures below describe behaviour of a mixed testosterone ester preparation and the general testosterone reference bands rather than a measured breakdown of this bottle.
Why a Mix Suits a Growth Block
Long, steady levels are what a mass block wants. A single long ester supplies that after two or three weeks of loading, but a mix gets there sooner because a short tail in the blend starts releasing immediately, and the long tails then hold the plateau without a mid-week dip between injections.
Everything the hormone does is unchanged by the mix. Testosterone drives protein synthesis and nitrogen retention, supports libido and red blood cell production, and aromatizes into estradiol, which is what brings the water, the appetite and part of the strength that people associate with a bulk. That last part is also the part that needs watching, because a high weekly total with uncontrolled estrogen produces pressure and fluid rather than more muscle.
Dosage Protocol
No approved dose exists for this product. The reference bands are the general testosterone scale, expressed in milligrams per week as the label total rather than by volume.
| Beginner | 300-400 mg weekly for eight to twelve weeks, given as two shots |
| Intermediate | 400-600 mg weekly, ten to twelve weeks, with estradiol and blood count taken mid-block |
| Advanced | 600-750 mg weekly, twelve to sixteen weeks, reserved for monitored use with blood pressure checks |
| Female | No confirmed protocol; virilization risk applies to any testosterone product |
| Administration | Intramuscular, twice weekly; rotate sites because of the higher concentration |
Because a bulk usually runs longer than a cut, the monitoring list is longer here: estradiol, complete blood count, lipids and blood pressure at baseline, mid-block and at the end. Rising hematocrit is the finding that most often forces a break rather than a dose change.
Suggested Protocols
- Classic mass base. OmniMass at 400-600 mg a week with Nandrolone (Deca and NPP) for joints and size, and an oral kickstart such as Dianabol 20 for the first four weeks.
- Leaner bulk. Keep the same base and add Primobolan 100 instead of an aromatizing oral, which limits the water carried through the block.
- Split the week. Two injections of around half the weekly total each keep the peak from the short fraction modest and usually reduce estrogenic side effects.
- Estrogen by result. Arimidex is added only against a high measured estradiol, never on a fixed schedule.
What to Expect
- Appetite and fullness first. In a surplus the early changes are appetite, mood and the look of the muscles rather than the scale.
- Strength by week four. Heavier working weights arrive before visible size, which appears over six to eight weeks.
- Water and blood pressure. Both reflect the weekly total and the estradiol result, and they show up before lean tissue does.
- New personal bests with a cost. Longer blocks raise hematocrit and worsen lipids, so progress is measured on the panel as well as the bar.
- Natural production stops. Recovery is a planned part of the block, not something to arrange later.
- Nothing without a surplus. The mix amplifies a calorie and protein plan; without one it produces water and little else.
Side Effects and Management
Post-Cycle Therapy
The long esters in the mix carry release for a fortnight after the final shot, so recovery starts after that window closes. A mass block usually ends near the upper edge of cycle length, which means recovery deserves the same planning as the cycle itself.
Buying the Mix
OmniMass is listed in the Xeno Laboratories range beside MegaTest 500 and SuperTest 375, which gives three concentrations of the same hormone to compare. The pages that usually accompany a mass block are Tamox for the recovery end, Equipoise for blood pressure and Nandrolone for deca-style joint support, all within the same brand.
Bulk cycles are the least forgiving place to improvise. A mix at 500 mg per ml makes a large weekly total fit into a small volume, and that convenience is the reason the total can drift upward without the user noticing. Writing the weekly figure down before the block starts, and holding it for the whole run, is a better control than reacting to how a single week feels.
