Peptide Comparison
FOXO4-DRIvsEpithalon
A senolytic peptide that clears aged "zombie" cells to support healthy aging — run in short, cycled courses a few times a year.
A tiny but mighty four-amino-acid peptide that activates your body's telomerase enzyme—essentially helping your cells hit the 'reset' button on aging by protecting and lengthening the protective caps on your chromosomes.
At a Glance
Quick
comparison
Dose Range
FOXO4-DRI
1–5 mg
Epithalon
5–10 mg
Frequency
FOXO4-DRI
Cycled — short courses 2–4 times per year, not daily year-round
Epithalon
Once daily
Administration
FOXO4-DRI
Subcutaneous injection
Epithalon
Subcutaneous injection
Cycle Length
FOXO4-DRI
Short "hit-and-run" cycles: either 3 doses over about a week, or a 2-week 5-on/2-off course, repeated every 4–6 months
Epithalon
4-6 weeks
Onset Speed
FOXO4-DRI
Works in bursts — senescent-cell clearance starts within days, and benefits build over the following weeks
Epithalon
Gradual (3-4 weeks)
Evidence Level
FOXO4-DRI
Preclinical only — animal and cell-culture studies; no human trials
Epithalon
Limited human trials
Efficacy
Benefit
ratings
Senescent cell clearance
Tissue rejuvenation (animal)
Selectivity for old cells
Healthy-aging support
Telomere Protection
Sleep Quality
Cellular Longevity
Technical Data
Compound
specifications
FOXO4-DRI
Molecular Formula
C228H388N86O64
Molecular Weight
5358 g/mol
Half-Life
Not formally established in humans; the D-retro-inverso design resists enzyme breakdown, giving longer stability than ordinary L-peptides
Bioavailability
Not established; animal studies used intraperitoneal injection. Oral bioavailability is not established
CAS Number
2460055-10-9
Epithalon
Molecular Formula
C14H22N4O9
Molecular Weight
390.35 g/mol
Half-Life
2-4 hours (estimated)
Bioavailability
High when injected subcutaneously
CAS Number
307297-39-8
Protocols
Dosing
tiers
FOXO4-DRI
Epithalon
Applications
Best
suited for
FOXO4-DRI
Senescent ("zombie") cell research
FOXO4-DRI is one of the best-studied tools for selectively clearing senescent cells in the lab. In aged mice and in human cells grown in a dish, it removed these worn-out cells while leaving healthy ones largely alone [1][2].
Healthy-aging and tissue-function research
In its first study, aged mice regained fur density, kidney function, and physical fitness after treatment [1]. Later work showed renewed blood-vessel cell function and less artery stiffness in animals [3]. This makes it a key research compound for understanding how clearing old cells affects whole-body aging.
Mechanism and drug-design research
Because scientists have mapped exactly where it binds p53 [5], FOXO4-DRI is valuable for studying the FOXO4–p53 survival pathway and for designing future senolytic drugs.
Epithalon
Longevity Enthusiasts
If you're serious about healthy aging and want to support your cells at the deepest level, Epithalon targets one of the fundamental mechanisms of cellular aging—telomere shortening. It's like giving your cells' protective caps a little extra reinforcement.
Sleep Quality Seekers
Epithalon helps regulate melatonin production by supporting your pineal gland. Many users report better sleep quality and more consistent sleep-wake cycles, especially those who've noticed their sleep getting worse with age.
Those Concerned About Oxidative Stress
Beyond its telomere effects, Epithalon acts as an antioxidant. If you're exposed to environmental stressors, have a demanding lifestyle, or simply want extra cellular protection, this peptide offers multiple mechanisms of support.
Immune System Support (Age-Related)
As we age, our immune system naturally weakens—a process called immunosenescence. Research suggests Epithalon may help maintain immune function by supporting the thymus and immune cell health, potentially keeping your defenses stronger as you age.
Safety Profile
Side
effects
FOXO4-DRI
Common
- Temporary tiredness during a cycle
Uncommon
- Injection-site reactions
Serious
- Cancer-pathway caution and allergic reactions
Epithalon
Common
- Injection site redness
- Mild headache
- Temporary fatigue
Uncommon
- Vivid dreams
- Sleep pattern changes
Serious
- Allergic reaction
Research Status
Safety
& evidence
FOXO4-DRI
Evidence Level
Preclinical only — animal and cell-culture studies; no human trials
FDA Status
Research compound (not approved for human use)
Safety Overview
FOXO4-DRI is generally run in short, spaced-out cycles, which keeps exposure low. The most common experiences are mild and short-lived: some tiredness or a flu-like feeling for a day or two during a cycle as your body clears dead cells, plus the usual minor injection-site soreness. The one real precaution worth taking seriously: because it activates p53, the protein that guards against cancer, anyone with active or recent cancer should only use it under an oncologist's care. If you are pregnant, breastfeeding, or under 18, skip it.
Contraindications
- xNo established human safety profile — any human use is experimental
- xActive or recent cancer (the p53 pathway it acts on is not characterized for this use in humans)
- xPregnancy and breastfeeding
- xChildren and adolescents
Epithalon
Evidence Level
Limited human trials
FDA Status
Research compound
Safety Overview
Epithalon has shown a favorable safety profile across decades of research, primarily conducted in Russia. Studies spanning up to 15 years of follow-up have reported no severe adverse events in older adults using Epithalon or its natural precursor Epithalamin. The peptide appears well-tolerated with minimal side effects, mostly limited to mild injection site reactions. However, large-scale clinical trials outside of Russia are still needed.
Contraindications
- xPregnancy or planning to become pregnant
- xCurrently breastfeeding
- xActive cancer or history of cancer
- xKnown allergy to peptide components
- xChildren and adolescents
Decision Guide
Which is
right for you?
Choose FOXO4-DRI if...
- Senescent cell clearance research
- Healthy-aging and longevity research
- Laboratory and preclinical study
Choose Epithalon if...
- Longevity and healthy aging
- Cellular rejuvenation
- Sleep quality improvement
- Antioxidant support