Creatine & TBI:

The Energy Crisis

Your brain is 2% of your body weight but burns roughly 20% of your total energy. It runs on extremely tight margins — there is almost no energy reserve. Under normal conditions, phosphocreatine works like a backup battery, storing energy and delivering it wherever neurons need it.

After a traumatic brain injury, this system breaks. The secondary injury cascade — the hours and days after the initial hit — sets off a chain reaction that directly attacks your brain's power supply:

• Brain chemicals flood the gaps between neurons — brain cells fire out of control, burning through energy reserves
• Calcium pours into cells — overactive receptors let in a massive wave of calcium, which overloads the cell's power plants (mitochondria)
• Mitochondria fail — too much calcium crashes the voltage that keeps mitochondria running, and energy production stalls
• Toxic byproducts spike — damaged mitochondria leak harmful molecules that destroy surrounding brain tissue
• Blood flow to the brain drops — less fuel and oxygen arrive right when the brain needs them most

The result is a brain in an energy crisis. Demand skyrockets while supply collapses. This energy shortage can last days to weeks after injury. For those of us with a history of multiple head injuries, the question is whether some level of this damage sticks around even longer.

This is where creatine enters the picture. Not as a muscle supplement. As an energy source for a system running on fumes.

How Creatine Works in the Brain

Your brain has its own high-speed energy delivery system. Creatine is at the center of it. Here's how it works in simple terms:

• Inside mitochondria (the cell's power plants), an enzyme loads energy onto creatine, turning it into phosphocreatine
• Phosphocreatine travels fast across the cell — much faster than raw energy (ATP) can move on its own
• At the point of demand, another enzyme converts phosphocreatine back into usable energy — right where the neuron needs it

Think of it like a power grid. ATP is the electricity, but it doesn't travel well over distance. Phosphocreatine is the high-voltage power line that moves energy efficiently from the power plant (mitochondria) to the outlets (synapses, pumps, and chemical signals).

After TBI, creatine protects the brain through several paths at once:

• Keeps mitochondria stable — prevents the voltage collapse that triggers cell death
• Blocks a critical emergency exit in the cell — the creatine system is physically part of a gateway in the mitochondria. When it's working, it keeps that gate shut and prevents the cell from self-destructing
• Reduces toxic byproducts — by keeping the energy shuttle running smoothly, creatine cuts down on the harmful molecules leaking from damaged mitochondria
• Acts as an energy reserve during the crisis — phosphocreatine provides backup energy that can be used without oxygen
• Fights against out-of-control cell firing — in lab studies, creatine prevented the kind of neuron death caused by overactive receptors

The Clinical Evidence

The Foundational Animal Study

In 2000, Sullivan et al. published the study that started this entire field. Mice given creatine for 1–5 days before a controlled brain injury showed less brain damage, scaling with the dose. Rats on a creatine-enriched diet for 4 weeks before injury showed 50% less brain damage than the control group. Their mitochondria stayed more stable and their energy levels held up significantly better.

This finding has been repeated across multiple labs and injury types. The animal evidence is consistent and reproducible. The mechanism is clear. The dose-response relationship is established.

The Only Human Trial: Sakellaris 2006

The most important clinical evidence comes from a Greek research team led by Dr. George Sakellaris. In a randomized pilot study, 39 children and adolescents (ages 1–18) with traumatic brain injury received either standard care or standard care plus oral creatine at 0.4 g/kg/day. The first dose was given within 4 hours of injury. Treatment continued for 6 months.

The results were striking:

• Shorter ICU stays in the creatine group
• Less time on ventilators and tube feeding
• Greater improvements in thinking, communication, self-care, and social function at 3 and 6 months
• No side effects reported

A follow-up study from the same patients (Sakellaris 2008) looked at post-injury symptoms specifically. The creatine group had significantly fewer headaches (p<0.001), less dizziness (p=0.005), and less fatigue (p<0.001) across the 6-month observation period.

What the Reviews Say

Ainsley Dean et al. (2017) published a focused review on creatine for mild TBI. They found major overlap between what goes wrong in a mild TBI and what creatine does at the cell level. A key finding: brain creatine levels measurably change after mild TBI — dropping in gray matter, rising in white matter — and this can be seen on brain scans. The review argued that creatine likely works best as a preventive measure in people at high risk (athletes, military) rather than as a treatment given after injury.

Candow et al. (2023) in Sports Medicine reviewed creatine's brain health applications broadly and rated the TBI/concussion evidence as moderate-to-high compared to other brain-related uses. The most recent full review (Vietor, Sticher & Ashraf, 2025) mapped creatine's effects onto each stage of the post-injury damage chain. Their conclusion: the reasoning is "strong" but the human trial data is "insufficient" for standardized treatment plans.

The Blood-Brain Barrier Problem

Here's the problem most creatine articles skip over: getting creatine into the brain is much harder than getting it into muscle.

Your brain has a security checkpoint called the blood-brain barrier. Creatine can cross it, but only through a specific transporter. The problem is that the cells wrapping around brain blood vessels don't have this transporter, creating a major bottleneck. On top of that, the brain already makes its own creatine, and brain creatine levels (6–12 mM) are already far higher than blood levels (~40 micromol).

The practical result: 5 g/day of creatine for 6 weeks raised brain creatine by only about 11% in healthy young men. Compare that to the 20–40% increases seen in skeletal muscle with the same dose. The brain is a harder target.

Here's an ironic twist: TBI itself damages the blood-brain barrier. This may actually increase how much creatine can get through during the window right after injury — which could partly explain why the Sakellaris trial, which dosed within 4 hours of injury, showed such strong results.

Dosing: What We Actually Know

The tension is clear. The only successful human TBI trial used doses equal to 28–32 g/day for an adult — far above the standard 5 g most people take. Higher doses (10+ g/day) seem to produce stronger brain effects in healthy people too. Yet 5 g/day is what most people default to, and it raises brain creatine by only 11%.

The honest answer on the best dose for brain protection: we don't know yet. The Bodker 2023 trial testing 5 g/day for lingering post-concussion symptoms is the study most likely to give us real-world adult data — but results aren't published yet.

Pre-Loading: The Strongest Hypothesis

The most convincing evidence points in a direction most of us wish we'd known about sooner: taking creatine before an injury is more protective than taking it after.

Every successful animal study used pre-injury supplementation periods of 1–4 weeks. The blood-brain barrier bottleneck means it takes weeks to meaningfully raise brain creatine stores through oral supplementation. And Ainsley Dean et al. (2017) argued directly that creatine's biggest value for mild TBI is likely as a preventive measure in high-risk groups — athletes in contact sports, military personnel in blast-exposure environments.

For those of us already living with TBI, the pre-loading window is past. But the logic still applies. If you're still exposed to head impacts (contact sports, certain training styles), keeping your brain creatine levels topped off through consistent daily supplementation is the closest thing to a preventive measure the evidence currently supports.

A scoping review by Giraldo et al. (2025) looked specifically at creatine for mild TBI in contact sport athletes. After screening 52 studies, only 4 met their standards. They found changes in brain chemistry ratios in concussed athletes that suggest creatine plays a role in restoring brain energy metabolism — but the best dose and timing are still undefined.

Honest Limitations

Being straight about this matters more here than in most supplement conversations. The gap between "the biology makes sense" and "this is clinically proven" is wider than the marketing suggests.

• No completed adult human TBI trials. The entire clinical evidence comes from one research group's two studies in kids. That's it.
• No mild TBI/concussion-specific human trials. The Sakellaris patients had moderate-to-severe TBI. Applying those results to adult concussion is a big leap.
• Best dose is unknown. Whether 5 g/day actually protects the brain in humans hasn't been answered.
• Sex differences are unstudied. Women may have different baseline brain creatine levels and responses. This is a major blind spot across all brain-related creatine research.
• Long-term brain protection is unproven. No data on whether creatine prevents or reduces chronic traumatic encephalopathy (CTE).
• One safety concern exists. A rodent study found that creatine after TBI lowered the threshold for seizures — a concern that hasn't been properly explored in humans.
• The "take creatine to protect against concussion" narrative in sports media is running well ahead of what the evidence actually supports.

What I Do With This Information

I'm not a doctor. This isn't medical advice. But here's my personal protocol based on the evidence above:

Is 5 g/day the best dose for brain protection? Probably not, based on the research. The Sakellaris trial used roughly 6x that. But 5 g/day is well-tolerated, has decades of safety data, raises brain creatine by a measurable amount, and is sustainable forever. Until we have adult TBI dosing data, I'm choosing the dose I can maintain for years over the dose that might be better on paper but has no human evidence behind it.

Assessment

Creatine is one of the most studied supplements in existence. The case for brain protection is legitimate. The mechanisms are well understood. The animal data is strong and repeated. The one human TBI trial showed real benefits. And creatine's safety record is exceptional.

But "legitimate case" and "proven therapy" are different things. We need adult mild TBI trials. We need dose-optimization studies. We need long-term follow-up data. The Bodker trial currently underway is a step in the right direction, but we're still in the early innings of understanding how to use this tool for the brain.

What I can say with confidence: creatine monohydrate at 5 g/day is safe, cheap, and has a real biological basis for brain protection backed by animal models, pediatric clinical data, and basic neuroscience. For someone living with TBI, the risk-reward math is about as favorable as it gets in the supplement world.

The barbell gets its protocol. The brain deserves one too. And this is one of the few supplements where the science says that might actually mean something.