Rankings / Longevity — Supplements
17-alpha estradiol
Longevity · Non-feminizing estrogen
Tier C-
Bottom line
Read Off Label grades 17-alpha estradiol as C- (4.5/10) based on preclinical evidence, variable benefit magnitude, and a low-med-risk safety profile.
ITP: significant male mouse lifespan extension at multiple doses; no female effect (Strong 2016).
Studied, labeled, or reported-use context: No established human dosing — Research chemical / compounded; not individualized guidance.
What the evidence says
ITP: significant male mouse lifespan extension at multiple doses; no female effect (Strong 2016). Unique in separating metabolic benefits of estrogens from feminization. Harrison lab ongoing work. Very limited human data.
Mechanism
Stereoisomer of 17β-estradiol with minimal ERα binding; non-feminizing; activates mTORC2 (not mTORC1); improves metabolic markers in males
Studied, labeled, or reported dose & route
No established human dosing
This records doses and routes described in studies, approved labeling, clinical practice, or documented use. It is not individualized guidance and does not establish safety; context changes with indication, formulation, health history, monitoring, and other medicines.
Citations
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Common questions
- What does the evidence show about 17-alpha estradiol's effects?
- Read Off Label rates the evidence for 17-alpha estradiol as Preclinical and the benefit magnitude as variable, producing an overall grade of C- (4.5/10). ITP: significant male mouse lifespan extension at multiple doses; no female effect (Strong 2016).
- What safety findings are reported for 17-alpha estradiol?
- 17-alpha estradiol has a low-med risk profile in the database. Low-Med (limited human safety data) Legal status: Research chemical / compounded.
- What doses or routes are reported for 17-alpha estradiol?
- No established human dosing This is context from studies, approved labeling, clinical practice, or documented use; it is not individualized guidance and does not establish safety.
- How does 17-alpha estradiol work?
- Stereoisomer of 17β-estradiol with minimal ERα binding; non-feminizing; activates mTORC2 (not mTORC1); improves metabolic markers in males
This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.