In a post on X, Vineeth K noted that many were curious about the device Goyal sported on the side of his head during his appearance on Raj Shamani’s podcast. The device, known as Temple, he explained, “is an experimental health-tech wearable designed to continuously measure blood flow to the brain.”
People wondering what is this device Deepinder Goyal is wearing on the side of his head.
The device, called “Temple”. It is an experimental health-tech wearable designed to continuously measure blood flow to the brain.The idea behind Temple comes from Goyal’s interest in… pic.twitter.com/WOhIyWlMNG
— Vineeth K (@DealsDhamaka) January 4, 2026
He further elaborated, “The concept of Temple stems from Goyal’s focus on aging, cognition, and longevity.” Vineeth mentioned that it relates to what he calls Goyal’s “Gravity Ageing Hypothesis,” examining how gravity may affect cerebral blood flow and overall brain function over time.
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“Temple is currently a research prototype, not a consumer product,” he made clear, indicating that what seemed unusual to many onlookers is “actually a preview of the future of wearable brain health technology.”
The Eternal CEO had previously hinted at Temple’s development, framing it as part of his enduring interest in understanding the aging process of the human brain and how technology could aid in monitoring cognitive health. So far, the device has been highlighted as an experimental initiative rather than a commercial product.
Nonetheless, the assertions surrounding Temple faced significant criticism from some medical professionals. Dr. Datta, a physician-scientist at AIIMS Delhi, stated, “As a physician-scientist and one of the earliest researchers in India in Arterial Stiffness and Pulse Wave Velocity (2017), which predicts cardiovascular mortality, I assure you that this device currently has 0 scientific basis as a useful device and do not waste your hard-earned money on fancy gadgets that billionaires can buy. If you are one, then go ahead.”
As a physician-scientist and one of the earliest researchers in India in Arterial Stiffness and Pulse Wave Velocity (2017) which predicts cardiovascular mortality, I can assure you that this device currently has 0 scientific standing as a useful device and do not waste your hard… https://t.co/pm0pxGRycd
— Dr. Datta M.D. (AIIMS Delhi) (@DrDatta_AIIMS) January 4, 2026
In response to Vineeth’s post, Dr. Datta remarked, “No, it is not the future. I must respectfully disagree. I’d be glad to be proven wrong in the future, but as of now, let’s not overhype pseudoscientific advancements!”
Back in December, Goyal had hinted at the arrival of the health-tech device. While specifics are still scarce, Temple’s website features an enigmatic tagline: “The future of health starts where no one’s looking. Inside your brain.”
This ongoing debate highlights broader issues regarding evidence, regulation, and responsible communication within the rapidly advancing realm of wearable technology.
Media reports previously indicated that the startup intends to raise approximately ₹415 crore. Investors reportedly include firms like Steadview Capital, Vy Capital, and others.
