Dr. Hiroki Shinkai's Longevity Protocol

Hiroki Shinkai has emerged as Brazil's leading voice at the intersection of functional medicine and biohacking, building a following of over 1.2 million subscribers on YouTube by translating cutting-edge longevity science into Portuguese with a clarity and rigor that resonates across the Brazilian health community. A Japanese-Brazilian physician trained in functional medicine, Shinkai occupies a unique position in the global longevity landscape — bridging the precision-driven optimization culture of figures like Bryan Johnson with the functional medicine traditions that emphasize root-cause intervention and personalized care.

Overview

Shinkai's approach to longevity is systematic, data-driven, and unapologetically interventionist. Where some longevity practitioners emphasize simplicity and skepticism toward supplementation, Shinkai leans into the full toolkit of modern anti-aging science — provided each intervention is supported by evidence and guided by individual biomarker data. His protocol integrates targeted supplementation, intermittent fasting, cold exposure, structured resistance training, sleep optimization, and regular laboratory testing into a cohesive system designed to slow biological aging and extend healthspan.

What makes Shinkai particularly influential in Brazil is his ability to contextualize these interventions for a population that has historically had limited access to the longevity medicine conversation, which has been dominated by English-speaking practitioners. His content breaks down complex topics — NAD+ metabolism, mitochondrial biogenesis, hormonal optimization, epigenetic clocks — in a way that is both scientifically grounded and accessible to a broad Portuguese-speaking audience. He does not simply relay Western biohacking trends; he evaluates them critically and adapts them to the realities of his patient population.

Supplementation Protocol

Shinkai's supplement stack is more extensive than many of his international counterparts, reflecting his belief that strategic supplementation — guided by bloodwork, not guesswork — can meaningfully move the needle on biological aging. His core recommendations center on several well-researched compounds.

NAD+ precursors, particularly NMN (nicotinamide mononucleotide), form the foundation of his anti-aging supplementation strategy. Shinkai cites the decline of NAD+ levels with age as a central driver of mitochondrial dysfunction, impaired DNA repair, and sirtuin deactivation. He recommends NMN supplementation with dosing individualized based on age, metabolic status, and response markers, while acknowledging that the long-term human data remains an active area of research.

Vitamin D is dosed aggressively by conventional standards, with Shinkai targeting serum levels between 60 and 80 ng/mL — well above the range most physicians consider adequate. He argues that the standard reference ranges reflect population averages in deficient societies rather than optimal physiological targets, and that robust vitamin D status is foundational for immune function, hormonal health, and bone density. Omega-3 fatty acids from high-purity fish oil are prescribed at therapeutic doses, targeting an omega-3 index above eight percent. Magnesium, typically in glycinate or threonate form, addresses the widespread deficiency he observes in clinical practice and supports sleep, stress adaptation, and neuromuscular function.

Creatine monohydrate rounds out the core stack — Shinkai prescribes it not only for its well-documented benefits in muscle performance and strength but for the growing evidence supporting its role in cognitive function and neuroprotection. Vitamin C at moderate doses supports collagen synthesis and antioxidant defense, while zinc is included for its critical role in immune regulation and enzymatic processes.

Intermittent Fasting

Shinkai incorporates intermittent fasting as a regular component of his protocol, typically recommending a sixteen-to-eight eating window for metabolically healthy individuals. He frames fasting not as a weight loss tool but as a metabolic intervention — a daily period of low insulin signaling that promotes autophagy, improves mitochondrial efficiency, and enhances metabolic flexibility. For patients new to fasting, he advocates a gradual transition, extending the overnight fast incrementally rather than imposing rigid windows from the start.

He is nuanced in his application of fasting, noting that it is not universally appropriate. Women in certain phases of their hormonal cycle, individuals with adrenal dysfunction, and those with a history of disordered eating may require modified approaches. Shinkai adjusts fasting protocols based on individual lab results and symptom presentation, a clinical flexibility that distinguishes his approach from the one-size-fits-all fasting prescriptions common in the biohacking space.

Cold Exposure and Exercise

Cold exposure is a staple of Shinkai's protocol, practiced through cold showers and ice baths. He recommends two to three minutes of cold exposure following warm showers, gradually progressing to dedicated cold immersion sessions at temperatures between 10 and 15 degrees Celsius. The physiological rationale includes activation of brown adipose tissue, increased norepinephrine production, improved circulation, and the hormetic stress response — a controlled stressor that strengthens the body's adaptive capacity over time.

Resistance training forms the exercise cornerstone. Shinkai programs progressive overload with compound movements — squats, deadlifts, presses, rows — performed three to four times per week, supplemented by two sessions of zone 2 cardiovascular work. He emphasizes that muscle mass is the single most important metabolic organ for longevity, serving as a glucose sink, a hormonal regulator, and a critical determinant of functional independence in later decades.

Sleep and Biomarker Tracking

Sleep optimization receives the same systematic attention as supplementation and training in Shinkai's protocol. He targets seven to eight hours of sleep per night, with specific interventions to improve sleep architecture: consistent sleep and wake times, evening magnesium supplementation, blue light restriction after sunset, cool bedroom temperatures, and elimination of caffeine after early afternoon. He uses wearable devices to track sleep stages and adjusts protocols based on trends in deep sleep and REM percentages.

Biomarker tracking is the thread that ties the entire protocol together. Shinkai recommends comprehensive blood panels every three to six months, monitoring markers that most conventional physicians do not routinely test: fasting insulin, homocysteine, high-sensitivity CRP, vitamin D, omega-3 index, DHEA-S, free and total testosterone, thyroid panel including reverse T3, and inflammatory cytokines. Every intervention — every supplement dose, fasting window, and training variable — is evaluated against this data and adjusted accordingly.

What Makes It Unique

Shinkai's protocol is notable for combining the data-driven optimization mindset of the Western biohacking movement with the clinical depth of functional medicine — and delivering it to a market that had been largely excluded from this conversation. His Japanese-Brazilian heritage gives him a natural bridge between Eastern and Western health philosophies, and his clinical practice grounds his recommendations in real patient outcomes rather than theoretical frameworks. For the growing community of health-conscious Brazilians seeking a rigorous, evidence-informed approach to longevity, Shinkai has become the definitive guide.