Dr. Tim Marshall - Regenerative Medicine Specialist

Dr. Tim Marshall - Regenerative Medicine Specialist Dedicated to identifying and addressing the root causes of "dis-ease" and chronic illness through a whole-systems approach called functional medicine.

✝️ 5-Week Advanced Health Transformation Program
Brain Recovery • Women’s Health• Autoimmune • Thyroid • Energy • Mood • Sleep
⬇️ To Book a Discovery Call
https://calendly.com/tmarshall73/30min My formal education is from the University of Arizona College of Medicine - specializing in neuropharmacology, medicinal chemistry, and nutritional biochemistry. I hold degrees in biochemistry, organic chem

istry, neuropharmacology - and in a previous life worked as a drug discovery chemist in Big Pharma (e.g. Pfizer and Sanofi). I offer optimized nutrient/supplement programs, highly effective nutritional solutions for common health issues, and holistic health and wellness coaching. Services: office consults (Tucson, AZ), and long-distance consults via phone, email, or Skype. I'm here to assist you in your wellness goals, and achieving the best health of your life. Please see my website, for specifics on services offered and fee schedule. https://www.dr-marshall.com/

NEW INSIGHTS INTO THE STATIN-CHOLESTEROL CONTROVERSYThis is a review article I wrote in the Journal of American Physicia...
06/26/2026

NEW INSIGHTS INTO THE STATIN-CHOLESTEROL CONTROVERSY

This is a review article I wrote in the Journal of American Physicians and Surgeons (JPANDS) discussing the issues with statin medications and the importance of higher levels of cholesterol for optimal health and well-being.

📔 Article: www.jpands.org/vol19no2/marshall.pdf

🧠 Cholesterol is a neuroprotective nutrient that the body needs in sufficient quantities (160+ mg/dL) to function optimally. Higher levels of cholesterol protect the brain and nervous system against a variety of chemicals and toxins due to its highly lipophilic nature.

⚗️In chemistry and pharmacology, “lipophilic” means “fat-loving” and based on the principle of “like dissolves like” - cholesterol attracts and binds to organic toxins - preventing them from damaging your body’s cells.

🧠 Many organic toxins are highly lipophilic meaning they’re attracted to and easily dissolve in fat. Since the brain is roughly 60% fat - organic toxins are attracted to and can accumulate in the brain and nervous system, which is why we need higher cholesterol levels, now more than ever.

📝 The adverse effects of statin medications include:
Memory loss & cognitive issues
Neurological issues
Mitochondrial dysfunction
Muscle damage & fatigue
Liver dysfunction

🫀Mitochondria - the energy-producing organelles found in every cell in our body - provide the “life force energy” that fuels millions of cellular functions. Mitochondria are the foundation for healthy brain function, and all healing and repair processes in the body.

☀️ For most people, despite what your doctor has told you - lowering your cholesterol is not beneficial for your brain, hormone balance, or immune system, which all function better with higher levels of cholesterol. Before the advent of statin medications in the 1980s, the average cholesterol level in the United States was 222 mg/dL. And depending on your physiology and level of toxin exposure - you may require a higher level for neuroprotection, and optimal health and well-being.



https://www.instagram.com/p/DXDXDAPFLma/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==

06/08/2026

Your blood and your neurons hold very different amounts of vitamin C.

Vitamin C cannot cross the blood-brain barrier on its own. The barrier is sealed tight and has no transporter for it. So the body pumps it in.

A protein called SVCT2 does the pumping, in two steps. First it carries vitamin C from blood into the cerebrospinal fluid, raising the level about 4 times. Then a second SVCT2 pump, sitting on the neuron itself, pulls it inside again. The neuron ends up holding roughly 200 times what is in the blood.
The cells that surround neurons, the glia, mostly do not have the pump. They sit in the same fluid, bathed in the same vitamin C, and hold only a fraction of what the neuron holds.

A neuron spends sodium and energy to do this against a steep gradient. It pays that cost for three reasons. It runs about 10 times the oxidative load of the cells around it, and vitamin C mops up the wreckage. It uses vitamin C as its single biggest antioxidant supply, bigger than glutathione, and uses it to recharge vitamin E. And it needs vitamin C as a one-electron donor to run the enzymes that build norepinephrine, collagen, and myelin.

The brain protects this pool harder than almost any tissue in the body. In scurvy, the liver runs dry while the brain still holds about a quarter of its normal vitamin C. The flip side is the part the marketing skips: you cannot flood it. Oral vitamin C raises brain levels by about 20 percent at most. The brain decides how much it keeps, not the bottle.

Harrison FE, May JM. Free Radic Biol Med. 2009
May JM, Qu ZC, Meredith ME. Biochem Biophys Res Commun. 2012

Part 1: Nutritional Biochemistry 101How much folate or methylfolate do you really need?
06/05/2026

Part 1: Nutritional Biochemistry 101
How much folate or methylfolate do you really need?

06/01/2026

Magnesium gets sold as the thing that "activates" your vitamin D. The real story is more precise, and worth getting right.

Vitamin D, whether from sun or food, is inactive when it first enters your body. Two enzymes have to switch it on. The first lives in the liver and adds one chemical group, turning vitamin D into 25(OH)D, the storage form your blood test measures. The second lives in the kidney and adds a second group, producing the active hormone your cells actually use.

Both of those enzymes are cytochrome P450s. The metal doing the chemistry at their core is iron, held in a heme group. Iron is what binds oxygen and inserts the modification onto the vitamin D molecule. So if you want to name the metal that powers vitamin D activation, it is iron, not magnesium.

Magnesium is not that metal. It is not sitting in the active site doing the catalysis. What it does is support the wider system: the surrounding enzymatic machinery and the hormone signaling that drives this pathway. That is a real role, but it is a supporting one, and the popular "magnesium is the cofactor that activates vitamin D" line blurs the distinction.

What makes magnesium worth talking about is what shows up in the blood. In a randomized controlled trial of 180 adults, magnesium supplementation did not simply raise vitamin D across the board. It depended on where people started. When baseline vitamin D was low, magnesium raised it toward the optimal range. When baseline was already high, magnesium pulled it back down toward that same range. It behaved like a tuner, not an accelerator. The authors concluded that good magnesium status helps optimize vitamin D status.

That is the useful takeaway. Vitamin D activation is a multi-part system. The catalytic engine runs on iron. Magnesium is one of the supporting inputs that helps the whole thing settle where it should. Chasing your vitamin D number alone, while ignoring the rest of the machine, misses how the system actually works.

One honest caveat. The tuning effect comes from a single trial of 180 people. The mechanism is sound and the result is striking, but it has not been replicated at scale, and the broader claim that magnesium status shapes vitamin D should be read as supported, not settled.

Jones et al., J Lipid Res, 2014 Dai et al., Am J Clin Nutr, 2018

✨NEW CLIENT TESTIMONIAL✨ After just 1 week of working with me - she began sleeping every night. This is after 50+ years ...
05/31/2026

✨NEW CLIENT TESTIMONIAL✨ After just 1 week of working with me - she began sleeping every night. This is after 50+ years of barely sleeping (1-2 hours per night, and consecutive nights of no sleep) for years, and suffering from numerous health issues as a result - she began to sleep 4-5 hours every night.

After 7 weeks of targeted nutrients to correct mitochondrial dysfunction, chronic inflammation, and underlying nutritional deficiencies and imbalances, she's consistently sleeping 7-8 hours per night, and has had multiple nights of 8+ hours of sleep for the FIRST TIME IN HER LIFE.

This is the POWER of Regenerative Medicine. Send me a DM, or see the link in my BIO to schedule a free consult to learn more.

05/31/2026

✨New client testimonial✨ After just 1 week of working with me, and after 50+ years of barely sleeping (1-2 hrs per night, and consecutive nights of no sleep) for years, and suffering from numerous health issues as a result. She began sleeping 4-5 hrs per night consistently after just 1 week of working with me, and after 4 weeks, got a full 8+ hrs of sleep for the FIRST TIME IN HER LIFE.

This is the power of regenerative medicine. Send me a DM, or see the link in my BIO to schedule a free consult to learn more.

05/29/2026

A reminder of what true love is:

4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5 It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6 Love does not delight in evil but rejoices with the truth. 7 It always protects, always trusts, always hopes, always perseveres.

1 Corinthians 13

FOR SALE: Summit to Sea (STS) Grand Dive Vertical 60" Hyperbaric Oxygen Chamber I'm selling a STS, top-of-the-line, like...
05/19/2026

FOR SALE: Summit to Sea (STS) Grand Dive Vertical 60" Hyperbaric Oxygen Chamber

I'm selling a STS, top-of-the-line, like-new hyperbaric oxygen chamber - includes 95% oxygen concentrator ($2,000).

INCLUDES (everything you need to get started with daily HBOT sessions)
1. AirSep NewLife Intensity Oxygen Concentrator (95%), 10 L/min
2. Three 80-liter Air Compressors

$16,500 OBO

The chamber, and 3 air compressors are approximately a year old. The AirSep NewLife Intensity Oxygen Concentrator is approximately 2 years old, and has a ton of life left.

https://www.summit-to-sea.com

Happy to answer any questions you might have (520-370-6044). I'm a Brain Recovery / Regenerative Medicine Specialist, and used HBOT in my own healing journey from two head injuries. For more info on my work, and if you need expert help to expedite your healing, there's a scheduling link on my IG page:

- One of the first vertical portable mild hyperbaric chambers on the market
- Designed to add an easy chair for ultimate comfort
- Vertical zipper design for easier entry and exit
- 7 feet tall
- 60" in diameter

Comes with redundant compressors (3) for added safety
Works on a standard 120V 15 AMP outlet
Antibacterial carpet for comfort
Full frame for faster inflation
Unique design
Protected by Patent 9,622,931

Address

Tucson, AZ

Opening Hours

Monday 10am - 6pm
Tuesday 10am - 6pm
Wednesday 10am - 6pm
Thursday 10am - 6pm
Friday 10am - 6pm
Saturday 11am - 6pm

Telephone

+15203706044

Website

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