17-alpha-Estradiol vs Micronized Progesterone

Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.

17-alpha-EstradiolMicronized Progesterone
CategoryHormonesHormones
Standard Dose
Timing
Cycle Duration
Evidence LevelPreclinicalStrong

Mechanism

Non-feminizing estrogen that extends lifespan in male mice via metabolic improvements. Reduces hepatic mTOR signaling, improves glucose homeostasis, and reduces inflammation without estrogenic effects on reproductive tissues.

Contraindications

  • Not FDA-approved for human use
  • Theoretical hormone-sensitive cancer risk

Mechanism

Bioidentical progesterone used to support luteal balance, sleep architecture, and selected HRT protocols.

Contraindications

  • Hormone-sensitive conditions without specialist oversight

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