Proprietary Anabolic & PCT Blend (75mg)


Letro XT Ingredients
Letro XT uses 2 different aromatase inhibitors to halt estrogen production and boost testosterone naturally.
Leading off the new Letro XT is a brand new compound called 3b-hydroxy-androsta-1,4,6-triene-17-one and is often dubbed the ATD imposter due to its structure and mechanism of action.

This compound is a suicidal, steroidal) aromatase inhibitor (AI) that permanently binds to the aromatase enzyme, thereby creating an irreversible reaction — effectively lowering estrogen production and increasing testosterone levels.[1,2]

Because it’s permanent / suicidal / irreversible, that receptor stays bound for its lifetime. You grow more receptors over time, but the effect is far longer-lasting. You can read more about this type of action in the Aromatase Inhibitor section of our Post Cycle Therapy article.

Plus, 3b-hydroxy-androsta-1,4,6-triene-17-one has an extended half-life in the body, which means you only need to take Letro XT once per day as opposed to multiple times per day like other AI’s on the market.


Up next is another variation or metabolite of our first ingredient. Aside from aromatase inhibition, the 4,6-testosterone metabolite of this powerful AI also binds to the androgen receptor (AR) and induces androgenic effects similar to was discussed above, as the work via similar pathways.

This should come as no surprise, when you learn that 4,6-testosterone has a significant binding affinity for the AR, which means it can interfere with the anabolic or androgenic action of hormones which bind the AR.

This is a relatively new compound in the AI world, and as such, a ton of research isn’t readily available at the moment. More digging will need to be done on it! However this is the reason you can expect not only oestrogen inhibition but also an enhanced androgenic boost from this product.

Results may vary from person to person

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

We make no ‘therapeutic claims’. Therapeutic goods are broadly defined by the TGA as products for use in humans in connection with:

• preventing, diagnosing, curing or alleviating a disease, ailment, defect or injury
• influencing inhibiting or modifying a physiological process
• testing the susceptibility of persons to a disease or ailment
• influencing, controlling or preventing conception
• testing for pregnancy


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