The key point is that there is evidence for cellular and tissue rejuvenation in animals, but no direct evidence yet that ER-100 reverses ageing in humans. [lifebiosciences.com], [wired.com]

Evidence supporting the idea

ER-100 is based on research showing that controlled expression of three genes (OCT4, SOX2, and KLF4, or "OSK") can partially reset epigenetic marks associated with ageing. Life Biosciences reports that preclinical studies showed OSK expression could restore more youthful patterns of gene expression, improve tissue performance, and restore visual function in animal models. [lifebiosciences.com]

David Sinclair's Harvard group previously reported that partial cellular reprogramming restored vision in aged or injured mice by rejuvenating retinal ganglion cells. These findings are the scientific foundation for ER-100. [sciencealert.com], [technologyreview.com]

According to reports on the ER-100 program, animal studies and non-human primate work suggested the treatment could restore function in damaged optic nerve cells and improve visual outcomes, which is why regulators allowed progression into human trials. [sciencealert.com], [wired.com]

What evidence is missing

There is currently no published human evidence showing that ER-100:

• Reverses biological age. [lifebiosciences.com], [wired.com]
• Makes humans younger. [gulfnews.com], [wired.com]
• Extends lifespan. [technologyreview.com], [wired.com]
• Rejuvenates multiple organs throughout the body. [gulfnews.com], [technologyreview.com]

The current Phase 1 trial is primarily evaluating safety and tolerability in patients with optic nerve diseases. Human efficacy data have not yet been reported. [lifebiosciences.com], [gulfnews.com]

How strong is the evidence?

If we think of evidence on a scale:

• Cell studies: encouraging. [lifebiosciences.com], [technologyreview.com]
• Mouse studies: promising evidence of cellular rejuvenation and restored vision. [sciencealert.com], [technologyreview.com]
• Monkey studies: suggestive but limited public data. [wired.com], [sciencealert.com]
• Human studies: trial has started, but no proof yet. [lifebiosciences.com], [gulfnews.com]

Bottom line

The evidence for ER-100 "reversing ageing" currently consists of animal data showing reversal of some age-related cellular changes and recovery of function in eye tissues. [lifebiosciences.com], [sciencealert.com]

That is scientifically exciting because it suggests aspects of ageing may be reversible. However, as of July 2026, there is no human evidence that ER-100 reverses ageing, only a human trial designed to test whether the approach is safe and potentially effective. [lifebiosciences.com], [gulfnews.com], [wired.com]

So the strongest accurate statement today is:

ER-100 has shown evidence of reversing some age-related cellular dysfunction in animals and is now being tested in humans to determine whether similar rejuvenation effects occur in people. [lifebiosciences.com], [sciencealert.com], [technologyreview.com]