Blackstone Labs | Chosen This 1 Stack (Chosen 1 + PCT-V + Gear Support) | 3-Product Stack

Blackstone Labs Chosen This 1 Stack is not a generic “muscle builder.” It is a three-product hormonal stack centered on Chosen 1, with PCT-V and Gear Support included because the formulation strategy is clearly cycle-based: drive lean mass and strength with a 1-Andro blend, then support the liver, recovery environment, and post-cycle rebound with ancillary products. That architecture tells you exactly what this stack is designed to do. This is a physique-focused, dry-gain stack for advanced users who want the harder, leaner look typically associated with non-estrogenic androgen pathways rather than water-heavy scale weight.

The centerpiece is 1-androstene-3b-ol,17-one, also known as 1-Andro or 1-DHEA. Mechanistically, it is a non-methylated pre-prohormone that converts through 3β-HSD and 17β-HSD into 1-testosterone, a potent non-aromatizing androgen. Because it does not aromatize into estrogen and is not converted into DHT through the usual route, the look it is associated with is typically drier and less watery than aromatizing compounds. The best verified product-specific data available indicates Chosen 1 provides a 65mg 1-DHEA blend per tablet, with 2 tablets daily commonly used, yielding 130mg per day. That places it within the lower end of the 110mg-330mg range discussed in the research context. In other words: likely active, but below the 330mg/day level used in the landmark study showing steroid-like improvements in lean mass and strength alongside meaningful adverse shifts in lipids and liver markers.

This formula also uses multiple delivery forms within that blend: standard 1-androstene-3b-ol,17-one, 1-androstene-3b-ol-17-one Undecanoate™, and 1-androstene-3b-ol,17-one Caprylate. The logic is straightforward: diversify ester and delivery behavior to potentially influence absorption kinetics and user experience across the dosing window. The Undecanoate™ form is a Blackstone Labs trademarked version, which gives the formula some identity beyond a single raw-material listing, but the exact breakdown of each form is hidden inside a proprietary blend, so you cannot verify how much of each delivery form you are actually getting.

Laxogenin appears in the stack through PCT-V. Here the science is much weaker than the marketing category usually suggests. Laxogenin is a plant-derived brassinosteroid often positioned as a non-hormonal anabolic support ingredient, theoretically tied to protein synthesis signaling, but human evidence is extremely limited. The most relevant dose context available is 200mg daily, and even that did not show convincing efficacy. Its inclusion makes sense from a category-positioning standpoint, but it should not be mistaken for a clinically established driver of muscle growth.

NAC is the most conventionally evidence-based support inclusion named here. N-acetyl cysteine functions as a precursor to glutathione, one of the body’s key endogenous antioxidant systems, and is commonly used in liver support formulas because it helps maintain redox balance under physiological stress. The limitation is that the amount in this stack is undisclosed, so the ingredient is directionally smart but impossible to fully evaluate.

As a system, the stack makes sense: the Chosen 1 portion pushes the anabolic objective, Gear Support is intended to help users tolerate the cycle better, and PCT-V is positioned to support the transition after the run. The biggest weakness is transparency. This is not a fully disclosed formula set; the key hormonal blend is proprietary, and the named support ingredients we can verify do not have disclosed amounts in the stack context. Compared with best-in-class transparent sports nutrition, that is a real limitation.

What should you expect? Day 1 is not like taking a stimulant pre-workout. You are not looking for a rush. Early use is usually defined by subtle changes: fuller training sessions, better aggression in the gym, and a sense that recovery and body hardness are trending in the right direction. Over 2-4 weeks, assuming training and food are aligned, this category is typically pursued for lean mass gain, strength increases, and a drier visual look. At the same time, the research context on 1-Andro makes it clear that lipid health, liver markers, and endocrine recovery are not side notes. This stack is built for users who understand both sides of that equation.