Letrozole and RAD-140 Interaction

Avoid
Mechanism-based 53% confidence

Letrozole and RAD-140 have a potentially harmful interaction with 53% confidence. Both Letrozole and RAD-140 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently. Both compounds affect the gonads and liver and heart, so monitoring these systems is recommended.

Compound Profiles

Letrozole

Aromatase Inhibitor | Potent Estrogen Suppression

Letrozole competitively and reversibly binds to the heme group of the aromatase enzyme (cytochrome P450 19A1), inhibiting its catalytic activity with greater potency than any other commercially available aromatase inhibitor. Aromatase catalyzes the final step in estrogen biosynthesis, converting testosterone to estradiol and androstenedione to estrone in peripheral tissues including adipose, muscle, liver, and brain.

Half-life: ~2 days (48 hours) Typical dose: 0.25-0.5mg EOD (on-cycle); 2.5mg/day (medical) pct, anabolic
aromatase androgenicaromatase inhibitorhepatotoxichpta suppressive
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RAD-140

Selective Androgen Receptor Modulator | Investigational SARM

RAD-140 binds to the androgen receptor (AR) with high affinity and selectivity, functioning as a full agonist in muscle and bone tissue while exhibiting minimal agonist activity in the prostate and other androgen-sensitive tissues. This tissue selectivity is achieved through differential cofactor recruitment: upon binding to the AR, RAD-140 induces a conformational change that favors interaction with coactivators predominantly expressed in skeletal muscle and bone, rather than those prevalent in prostate or sebaceous glands.

Half-life: ~60 hours Typical dose: 10-20 mg/day sarm, anabolic
androgen receptorepo receptor androgenicblood pressure raisingcarcinogenic riskcrosses bbb
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Combined Organ Load

Gonads
elevated
Liver
elevated
Heart
moderate
Pituitary
low

Shared Safety Flags

2x 2 androgenic compounds (Letrozole, RAD-140). Additive androgenic load — increased risk of hair loss, acne, prostate effects.
2x 2 hepatotoxic compounds (Letrozole, RAD-140). Liver damage risk significantly increased. Include liver support (TUDCA/NAC) and monitor ALT/AST.
2x 2 HPTA-suppressive compounds (Letrozole, RAD-140). Deep hormonal shutdown expected — plan extended PCT.
2x 2 compounds disrupt lipids (Letrozole, RAD-140). Get lipid panel mid-cycle — consider adding lipid support.

Frequently Asked Questions

Can I take Letrozole with RAD-140?

Combining Letrozole with RAD-140 is not recommended. Both Letrozole and RAD-140 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently.

Is Letrozole and RAD-140 safe together?

This combination carries significant risk. Both Letrozole and RAD-140 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently. Consult a healthcare professional before combining.

What are the interactions between Letrozole and RAD-140?

Both Letrozole and RAD-140 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently. This assessment has 53% confidence and is inferred from pharmacological mechanism analysis.

How should I time Letrozole and RAD-140?

Letrozole has a half-life of ~2 days (48 hours) and RAD-140 has a half-life of ~60 hours. No specific timing requirements identified for this combination, but separating administration can help monitor individual effects.

Check this pair in the full Interaction Checker Full comparison: Letrozole vs RAD-140

This interaction analysis is compiled from research literature and pharmacological mechanism data. This assessment is inferred from known mechanisms and may not reflect all real-world outcomes. Always consult a healthcare professional before combining compounds.