Long-standing patients may remember Dr. Dale Bredesen’s books in our waiting room or his presentations playing during an office visit. His work has been part of our continuing interest in cognitive health for years. Dr. Kathryn Retzler completed two in-person trainings, and we have attended lectures and followed the research as it has developed.

The clinical question that drew our attention remains useful: what else may be affecting this person’s ability to think, remember, and function? A patient with memory concerns may also have untreated sleep apnea, hypertension, medication effects, depression, or a nutritional deficiency. Identifying those concerns matters even when a neurodegenerative condition is also present.

What the Bredesen Approach Contributes

The Bredesen approach, commonly associated with ReCODE, uses an individualized assessment to investigate multiple potential contributors to cognitive decline. Recommendations may address nutrition, exercise, sleep, metabolic abnormalities, and other findings rather than applying the same plan to every patient.

That framework overlaps with how we practice preventive medicine. Its value, however, does not establish every proposed test, target, or treatment as effective. Each recommendation still needs a clinical rationale, an assessment of benefit and risk, and a reasonable way to evaluate the patient’s response.

The published research has included a small pilot study that reported cognitive improvement during a personalized program. Because that study lacked a randomized comparison group, it could not determine how much improvement was attributable to treatment or which components were responsible.¹

What the Newer Randomized Study Adds

A randomized study first posted in December 2025 evaluated 73 participants with mild cognitive impairment or early dementia. The latest posted version, dated April 20, 2026, remains identified as a preprint that has not been peer-reviewed. The authors reported improvements in several cognitive domains and symptom measures with personalized care compared with standard care. The difference in Montreal Cognitive Assessment scores did not reach statistical significance.²

These findings deserve attention, but the study is small and evaluates a package of interventions. It cannot establish which elements account for the reported benefit, whether every component is necessary, or how broadly the findings apply. Improvement in cognitive testing also does not, by itself, demonstrate reversal of Alzheimer’s pathology. Independent replication and longer follow-up would help clarify durability and clinical value.

Broader lifestyle research provides a separate reason to support coordinated care. In the 2025 U.S. POINTER randomized trial, a structured program combining several lifestyle measures produced greater improvement in global cognitive performance than a self-guided program over two years. This supports sustained guidance and follow-up, although it does not validate every element of a branded protocol or establish long-term Alzheimer’s prevention.³

How We Apply These Principles

At HormoneSynergy®, the assessment begins with the patient’s history and the changes they have noticed. We consider when symptoms began, whether they fluctuate, and whether they interfere with work, relationships, or daily responsibilities. Medications, alcohol use, sleep, mood, hearing, and relevant medical conditions belong in that review.

Cognitive testing can help document performance in domains such as attention, memory, processing speed, and executive function. It contributes information to the assessment but cannot establish the cause of an impairment on its own. Persistent or progressive symptoms may require neurological evaluation, formal neuropsychological testing, imaging, or other diagnostic investigation.

Sleep, Metabolism, and Circulation

Sleep concerns require more than a general recommendation to get additional rest. Insomnia, snoring, witnessed breathing pauses, and daytime sleepiness may point to problems that deserve specific evaluation. Treating a sleep disorder can improve health and daytime function without requiring a claim that it prevents Alzheimer’s.

Cardiovascular and metabolic assessment is equally important. Blood pressure, glucose regulation, lipids, smoking, and existing vascular disease can influence the health of the brain’s circulation. We interpret these findings together and select additional testing when it can inform a decision. Our preventive cardiology approach is therefore relevant to patients concerned about cognitive aging.

Exercise recommendations consider aerobic fitness, strength, balance, and the patient’s starting capacity. Nutrition should provide adequate protein, energy, fiber, and micronutrients while addressing relevant metabolic concerns. A plan that a patient can maintain is more useful than an intensive regimen that becomes unmanageable after a few weeks.

Hormones, Nutrient Status, and Digestive Health

Hormonal conditions can affect sleep, mood, energy, and concentration. Thyroid disease or significant menopause symptoms may warrant assessment and treatment, but a hormone prescription should follow an individualized indication. Menopausal hormone therapy is not recommended specifically to prevent dementia.⁴

Nutrient recommendations also need a defined purpose. Restricted intake, digestive disease, or malabsorption may justify investigation, and documented deficiencies should be addressed. Research into the gut-brain relationship is developing, but gastrointestinal symptoms or a microbiome result should not automatically be presented as the cause of cognitive decline.

RetzlerRx® supplements may be incorporated when appropriate to an individual recommendation. Their role should be explained, including the intended benefit, dose, interactions, and need for reassessment. No supplement program should be represented as established Alzheimer’s prevention or a replacement for diagnostic care.⁵

Brain Fog, Mild Cognitive Impairment, and Dementia

These terms describe different clinical situations. Someone who feels mentally fatigued after months of disrupted sleep does not necessarily have the same condition as someone with progressive loss of memory and everyday function. Overlapping contributors do not make the diagnoses interchangeable.

Early evaluation can identify treatable conditions, establish a useful baseline, and guide appropriate care. When Alzheimer’s or another neurological disorder is suspected, preventive and lifestyle measures should accompany indicated specialist evaluation and treatment. They should not delay it.

The HormoneSynergy® Perspective

We value Dr. Bredesen’s contribution to a more individualized discussion of cognitive health. His work has encouraged attention to medical and lifestyle concerns that may be overlooked when care focuses narrowly on a cognitive score or diagnosis.

Our responsibility is to translate that interest into practical care with clear priorities and realistic expectations. We explain which findings merit intervention, what benefit is reasonably expected, and how progress will be assessed. As stronger research becomes available, recommendations should change accordingly.

Frequently Asked Questions

Has Dr. Kathryn Retzler trained in the Bredesen approach?

Yes. Dr. Kathryn Retzler completed two in-person trainings and has followed Dr. Dale Bredesen’s work for years. Selected principles inform HormoneSynergy®’s broader approach to cognitive and preventive health.

Is HormoneSynergy® formally affiliated with ReCODE?

HormoneSynergy® is an independent clinic and does not claim a formal collaboration with Dr. Bredesen or ReCODE. This article describes shared principles and clinical influences.

Has the newer randomized trial been peer-reviewed?

The latest posted version, dated April 20, 2026, is labeled as not peer-reviewed. Its findings should be interpreted as preliminary.

Does this research prove Alzheimer’s can be reversed?

No. Reported improvements in cognitive performance do not by themselves establish reversal of Alzheimer’s pathology or a reliable treatment effect across patients. Larger, independently replicated studies and longer follow-up are important.

Does personalized care replace neurological evaluation?

No. Persistent or progressive cognitive symptoms require an appropriate diagnostic assessment. Lifestyle and preventive care can complement specialist evaluation and indicated treatment.

References and Further Reading

1. Toups K, et al. Precision Medicine Approach to Alzheimer’s Disease: Successful Pilot Project. 2022. Read the published pilot study.
2. Toups K, et al. Precision Medicine Treatment of Alzheimer’s Disease: Successful Randomized Controlled Trial. Preprints.org. First posted December 2025; version 3 posted April 20, 2026. Not peer-reviewed. Read the preprint.
3. Structured vs Self-Guided Multidomain Lifestyle Interventions for Global Cognitive Function: The US POINTER Randomized Clinical Trial. JAMA. 2025. Read the trial.
4. International Menopause Society. Brain Fog and Memory Difficulties in Menopause. 2022.
5. National Institute on Aging. Cognitive Health and Older Adults.

This article provides general education and does not replace individualized medical advice. Cognitive symptoms should be discussed with a qualified clinician.