Tier 2 — strong

Phase 1, Single-Center, Double-Blind, Randomized, Placebo-Controlled Studies of the Safety, Tolerability, and Pharmacokinetics of Single and Multiple Ascending Oral Doses of the Sirtuin 6 Activator SP-624 in Healthy Adults

Greg Rigdon, Yuki Prescott, John Hall, Kelly Abernathy, Joel Raskin, William Wargin
Clinical Pharmacology in Drug Development 2025 14(1):18-25

Bibliography

PubMed
PMID 39587867
PubMed Central
PMC11701958
Funding
The publication is a Sirtsei Pharmaceuticals study; the article copyright identifies Sirtsei Pharmaceuticals and the authors are affiliated with Sirtsei/Arrivo BioVentures.
Competing interests
All authors reported consulting for Sirtsei Pharmaceuticals, a wholly owned subsidiary of Arrivo BioVentures, and all reported minority equity interests in Arrivo BioVentures.

Study snapshot

DesignTwo Phase 1 randomized, double-blind, placebo-controlled single- and multiple-ascending-dose studies with a food-effect component.
ModelHealthy adult volunteers.
SampleMultiple small Phase 1 cohorts across SP-624-101 and SP-624-102; cohort allocations are reported in the paper.
InterventionSP-624 single doses of 3, 10 or 30 mg; repeated 3 or 10 mg daily for 5 days and 20 mg daily for 10 days, versus placebo.
DurationSingle dose to 10 days depending on cohort.
EndpointsSafety and treatment-emergent adverse events; pharmacokinetics; Cmax; AUC; food effect

What the study showed, in plain terms

This is direct human evidence that a synthetic SIRT6 activator can be orally administered. Across two small Phase 1 studies, SP-624 reached target plasma concentrations and no serious adverse events were reported; the studies were designed for safety and pharmacokinetics, not longevity outcomes.

Key findings

Exposure increased approximately dose-proportionally, food lowered peak concentration while leaving overall exposure comparable, and the program advanced 20 mg daily into Phase 2 testing.

What this study can and cannot tell us

Small, short Phase 1 studies cannot establish long-term safety, healthspan effects or efficacy for aging. The authors had direct company affiliations and equity interests.

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