Cynthia Thurlow on creatine: what she recommends and why

Cynthia Thurlow didn't always recommend creatine. For years she focused almost entirely on intermittent fasting, protein, and hormonal health. Then the research shifted her view, and she shifted her recommendations with it.

Today, creatine sits at the top of her supplement list. Not protein powder. Not collagen. Not another adaptogen. Creatine monohydrate.

If you've been following Thurlow's work and wondering what the fuss is about, this guide breaks it all down: what she recommends, exactly why she recommends it, the science backing her position, and how to put it into practice. Whether you're in your 40s or 60s, whether you lift weights or just want to stay sharp, her reasoning applies more broadly than most people expect.

Who is Cynthia Thurlow?

Cynthia Thurlow is a nurse practitioner with over 20 years of clinical experience, primarily in emergency medicine and cardiology. She holds advanced degrees from Johns Hopkins, has additional training in functional nutrition, endocrinology, and gastroenterology, and is a two-time TEDx speaker. Her 2019 talk on intermittent fasting has nearly 6 million views.

She's the host of the Everyday Wellness podcast and the author of "Intermittent Fasting Transformation." Her audience is primarily women aged 35-65 who are navigating perimenopause, menopause, and the broader terrain of midlife health optimization.

What sets Thurlow apart from typical wellness influencers is the clinical depth. She reads the research. She interviews the researchers directly on her podcast. And when the evidence changes, she says so.

Her creatine advocacy didn't come from a brand partnership. It came from conversations with Dr. Darren Candow, one of the world's leading creatine researchers, and from digging into data showing that women are dramatically under-studied and under-supplemented when it comes to this particular compound.

The core recommendation: what Thurlow says to take

Dose

Thurlow recommends 3-5 grams per day as the standard range for most adults. She doesn't advocate loading protocols, stating she sees "no clinical benefit from loading dosing." For people new to creatine or those who experience any GI sensitivity, she suggests starting at 1.5 grams and gradually working up to 5 grams over a few weeks.

She's pragmatic about the exact number. Three grams is a solid baseline. Five grams is where most of the research is concentrated. You don't need more than that.

Form

She consistently recommends creatine monohydrate. Specifically Creapure-grade, a German-manufactured form that uses purified water washing to eliminate impurities and heavy metal contamination. She's been direct about the quality issue in the supplement industry: "there's a lot of junk out there," and creatine is no exception.

Her co-branded product with MD Logic Health uses 5 grams of Creapure creatine monohydrate per serving. She chose MD Logic because of their double laboratory testing and full label transparency.

The message on form is consistent across her content: creatine monohydrate has decades of safety data, it works, and exotic forms like creatine HCl or creatine nitrate have far less evidence and far higher prices. Monohydrate is the standard. Use it.

If you're evaluating any creatine product, the supplement interaction checker is a good first step to confirm it fits with whatever else you're currently taking.

Timing

This is where Thurlow is refreshingly non-obsessive. She says you shouldn't "get caught up in the before and after timing nonsense" because "your body keeps track over a 24-hour period." Creatine works through saturation of muscle tissue over weeks, not through acute spikes around workouts.

Her only meaningful timing recommendation: take it inside your eating window if you practice intermittent fasting. She personally doesn't take creatine fasted. Beyond that, take it whenever is convenient enough that you'll actually do it consistently.

Consistency is the whole game with creatine. It saturates tissue over weeks, not hours. Missing one day doesn't matter. Missing months because the timing felt too complicated does.

Why she pushes creatine so hard for women

Here's what most people don't know: women start at a baseline disadvantage with creatine.

Females have 70-80% lower endogenous creatine stores compared to males. Not a small gap. A massive one. This gap exists because women produce less creatine endogenously, typically eat less red meat (the primary dietary source), and have smaller overall muscle mass where creatine is stored.

Then estrogen drops.

Estrogen has anabolic properties. It supports muscle protein synthesis, bone maintenance, and creatine metabolism. As estrogen declines in perimenopause and menopause, all three of those processes become less efficient. The body's ability to synthesize and retain creatine declines alongside it.

Thurlow calls this a perfect storm. You're already starting with 70-80% less creatine than men. Then the hormones that help you use creatine efficiently start to fall. And the muscle, bone, and cognitive changes that follow are exactly what supplemental creatine can address.

This isn't theoretical. The biological age calculator can show you where you stand on several metabolic and physical markers that creatine directly influences.

For muscle and strength

Sarcopenia, the age-related loss of muscle mass and strength, accelerates dramatically in the years around menopause. Women can lose 3-8% of muscle mass per decade after 30, and that rate increases after menopause.

A 2017 meta-analysis of 22 studies found that women and men over 50 who combined creatine supplementation with resistance training gained an average of 3 additional pounds of lean muscle compared to placebo plus training. The exercise was still required. But creatine meaningfully amplified the results.

Thurlow frames this as an anabolic resistance problem. Older women need more stimulus to achieve the same muscle protein synthesis response as younger people. They need more protein than the standard recommendations. They need creatine on top of that protein, because creatine replenishes ATP, the cellular energy currency that powers muscle contractions and recovery.

The practical implication: if you're already lifting and eating enough protein and not gaining muscle, you may not be giving your cells enough energy to do the work. That's where creatine fills the gap.

For bone density

Bone health rarely comes up in discussions of creatine outside of Thurlow's content. But the evidence is there. A 2-year randomized controlled trial on postmenopausal women found that creatine supplementation combined with resistance exercise maintained section modulus and buckling ratio at the femoral neck, key bone geometry markers that predict fracture resistance. Bone density alone doesn't tell the full story of fracture risk. Geometry matters too. Creatine appears to help preserve it.

For women navigating the years when fracture risk is rising, this is a meaningful data point.

For brain function and mood

This is the angle that most creatine marketing ignores. Thurlow has made it central to her case.

The brain stores and uses creatine to produce ATP, just like muscle does. Women have lower creatine concentrations in the frontal lobe specifically, the region responsible for mood, working memory, executive function, and emotional regulation. When brain creatine is low, cognitive performance under stress degrades faster.

Multiple studies show creatine supplementation improves mood, reaction time, and working memory in women. An 8-week randomized trial in perimenopausal and menopausal women found improvements in reaction time, lipid metabolism, and reduced severity of mood swings with creatine supplementation.

Thurlow has discussed creatine's cognitive applications beyond menopause as well. She's experimented personally with higher doses (10-15 grams for three days) to combat jet lag and sleep deprivation, situations where brain ATP demand spikes, and reported noticeable benefit. She's covered the emerging research on creatine and traumatic brain injury recovery, noting that TBI patients who had higher creatine levels before injury showed better outcomes.

The cognitive angle matters for a broader audience too. You don't need to be in menopause or lifting heavy weights to benefit from better brain energy. And most people aren't eating enough red meat to keep their brain creatine stores topped up.

WinAging's approach to longevity covers the full spectrum of what's actually supported by evidence, not just what's popular. Creatine belongs in that category for both physical and cognitive health.

Creatine and intermittent fasting

Thurlow has built her brand on intermittent fasting. So one of the most common questions from her audience is whether creatine fits with an IF protocol.

Her answer is simple. Yes, it fits. Take it inside your eating window.

She doesn't make a strong claim about whether creatine technically "breaks" a fast from an autophagy or metabolic standpoint. Her personal practice is to take it with food rather than fasted, primarily to avoid any GI discomfort and because there's no demonstrated benefit to taking it on an empty stomach.

For people doing 16:8 or similar protocols, this means creatine goes with your first meal or your workout-adjacent meal, whichever you prefer. The saturation model of how creatine works means timing precision within the day is far less important than daily consistency over weeks.

One nuance she addresses: if you're already getting good results from intermittent fasting, creatine doesn't interfere. The two work through different mechanisms. Fasting works through reducing insulin, extending fatty acid oxidation, and triggering cellular cleanup processes. Creatine works through ATP regeneration and osmotic effects in muscle and brain tissue. They're complementary, not competitive.

Creatine and protein: the combination

Thurlow typically advocates high protein intake for her audience, often around 1 gram per pound of body weight daily, well above standard recommendations. She frames creatine as working synergistically with that protein, not as a substitute for it.

The mechanism: creatine fuels the ATP needed for resistance training sessions. Those sessions send the anabolic signal for muscle protein synthesis. Dietary protein provides the amino acids to build the muscle. Creatine enables better training, which signals more synthesis, which the protein then supports.

When anabolic resistance is present, both protein AND creatine need to be elevated to overcome the blunted signal. Getting enough protein without adequate ATP, or having ATP without sufficient protein, limits the results on both ends.

She's also addressed the water retention concern that keeps many women from starting creatine. Yes, creatine causes some intramuscular water retention in the first few weeks. This is intracellular, meaning the water is going into muscle cells, not accumulating in fat or subcutaneous tissue. The slight weight increase on the scale reflects fuller, more hydrated muscle tissue. It's a sign the creatine is working. And for women who are worried about "looking puffy," she's consistent: that's not what's happening, and the downstream effects on muscle, bone, and brain are worth it.

Not sure how creatine fits into your overall longevity stack? The AI protocol builder can design a personalized protocol based on your goals, age, and experience level.

What form of creatine does she actually use?

Thurlow has been consistent across years of content: creatine monohydrate, Creapure-grade.

She's compared this specifically to creatine HCl, which is marketed heavily as a more bioavailable form that causes less water retention and requires lower doses. Her assessment: the evidence doesn't support the marketing. Creatine monohydrate has the depth of research behind it. Creatine HCl has the marketing.

The actual comparison between monohydrate and HCl forms is covered in depth in the instantized creatine guide, which breaks down processing methods and what they actually change about absorption and performance.

For Thurlow's purposes, Creapure grade monohydrate handles both concerns simultaneously: it's the most studied form AND it has been processed to remove impurities that lower-grade monohydrate might contain. If you're buying generic creatine from a mass-market brand that doesn't specify its source or purity, you may not be getting Creapure. Check the label.

Who else benefits from Thurlow's recommendations?

Her audience is primarily women aged 35-65 in perimenopause or menopause. But her creatine reasoning applies more broadly:

Vegetarians and vegans. Dietary creatine comes almost entirely from animal products, primarily red meat and fish. Plant-based eaters have lower baseline creatine stores across the board. Supplementation doesn't just help. For many vegetarians, it's essentially correcting a deficiency.

Anyone over 40, male or female. Endogenous creatine production declines with age. The muscle loss and cognitive changes that Thurlow associates with female hormonal shifts also happen, more gradually, in men as testosterone declines.

People doing cognitive work under pressure. If your job involves sustained focus, problem-solving, or performance under stress, brain creatine stores matter. Thurlow has discussed how sleep deprivation specifically depletes brain creatine, making supplementation particularly relevant for people who regularly work long hours or travel across time zones.

Athletes and recreational exercisers who want more from their training. This is the population creatine was originally studied in. The evidence here is the deepest, spanning decades of research.

The creatine calculator can help you dial in the right daily dose based on your body weight and training level if you want to go beyond the standard 3-5g range.

Biomarkers worth tracking

Thurlow doesn't recommend creatine and then forget about it. She emphasizes tracking to know if your interventions are working.

For creatine specifically, the most relevant markers:

Lean mass and muscle strength. The most direct measure. DEXA scan is the gold standard. A body composition scale is a reasonable alternative for tracking trends. Grip strength is a surprisingly useful proxy for overall muscle function. Thurlow references grip strength data regularly in her content on aging.

Bone density. A DEXA scan gives you this alongside body composition. If you're in or approaching menopause, having a baseline bone density measurement is worth doing before starting creatine so you can track the impact over 1-2 years.

Cognitive performance. Harder to measure objectively at home. Reaction time apps exist. Neurological assessments are available through some functional medicine providers. At minimum, paying attention to subjective energy, focus, and mood over the first 8-12 weeks tells you something.

Creatinine levels. Creatine supplementation does increase serum creatinine because creatinine is a creatine metabolite. This is NOT a sign of kidney damage. It's a normal physiological response to creatine use. If your doctor orders bloodwork and sees elevated creatinine, tell them you're supplementing with creatine before they alarm you with a kidney disease conversation.

Common questions from her audience

Does creatine cause hair loss in women?

This concern comes up frequently and Thurlow has addressed it. The theoretical mechanism involves DHT, a testosterone metabolite that can accelerate androgenetic hair loss. One small study suggested creatine supplementation might raise DHT levels in young male rugby players. Thurlow's position: the evidence is not strong, the effect has not been replicated consistently, and the study was in young men, not women. Women's hormonal context is different. She continues to recommend creatine for women without major concern about this mechanism.

That said, if you're already dealing with significant hormone-related hair loss in perimenopause, it's worth monitoring and discussing with your doctor.

Can you take creatine on rest days?

Yes, and Thurlow recommends it. Daily dosing maintains tissue saturation regardless of whether you trained that day. Rest-day dosing is how creatine works best.

Does creatine interact with other supplements she recommends?

She commonly stacks creatine with:

• Myo-Inositol: she offers a creatine plus inositol bundle through her product line, citing complementary benefits for sleep quality, blood sugar, and metabolic flexibility. The berberine and inositol guide covers inositol's mechanisms in detail if you want the deeper science.
• Protein powder: no interactions, straightforwardly complementary.
• Magnesium: she advocates magnesium widely for her audience. No meaningful interaction with creatine.
• Vitamin D3+K2: standard in her protocol. No interaction issues with creatine.

For a full interaction check on any stack you're building, use the WinAging supplement interaction checker.

Is creatine safe long-term?

Thurlow is direct: creatine monohydrate has one of the largest safety evidence bases of any supplement in existence. Decades of research at doses of 3-5g per day show no adverse effects on kidney or liver function in healthy adults. The kidney concern is a persistent myth that emerged from a misunderstanding of how creatinine levels work (see above).

She does note that people with pre-existing kidney disease should consult their doctor before starting creatine. But for healthy adults, the safety profile is exceptional.

What about creatine gummies and chews?

The market for creatine gummies vs powder has grown significantly. Thurlow's focus is on Creapure-grade monohydrate rather than delivery format. The gummy format can work if it contains the right dose and form, but most products in this category use doses too low to achieve tissue saturation or don't specify Creapure-grade material. Check the dose and the source before choosing a gummy over powder.

The research she draws on most

Thurlow's creatine content is notably research-dense. She interviews researchers rather than just reading headlines. A few key papers that anchor her recommendations:

The 2021 systematic review "Creatine Supplementation in Women's Health: A Lifespan Perspective" (PMC7998865) provides the conceptual framework she uses. This review covers creatine across the female lifespan from menstruation through pregnancy to menopause, documenting the consistent underperformance of women's creatine stores relative to need.

The 2-year RCT on postmenopausal women and bone health (PMC10487398) is the primary paper she cites on creatine and bone geometry. It's a longer-duration, placebo-controlled study which gives it considerably more weight than shorter interventions.

The meta-analysis of 22 studies on creatine and lean mass in adults over 50 provides her core muscle-building argument. The finding that creatine plus resistance training produces an average of 3 pounds more lean mass than training alone is a consistent reference point in her content.

Dr. Darren Candow's published work on creatine and aging, which she covers in depth on Everyday Wellness Episode 301. Candow is based at the University of Regina and has published extensively on creatine in older adults, bone health, and cognitive function.

The 2025 paper "Creatine in women's health: bridging the gap from menstruation through pregnancy to menopause" (Tandfonline) is the most current comprehensive review she references, published after her Episode 524 with Mike Mutzel on creatine monohydrate.

Practical protocol: how to actually start

If Thurlow's reasoning has convinced you and you want to start:

Week 1-2: Start at 1.5-2.5 grams daily to let your gut adjust. Some people experience loose stools or minor cramping at higher doses initially. Starting low prevents this.

Week 3 onward: Move to 3-5 grams daily. Take it with a meal. Take it at the same time every day to build the habit.

First 4 weeks: Don't expect dramatic changes. Creatine works by saturating tissue. You're loading during this period. You might notice slightly fuller muscles and marginally better performance in training sessions, but the meaningful changes take longer.

Weeks 6-12: This is typically when the results become more noticeable. More endurance within sets. Slightly faster recovery between sessions. Some cognitive improvements in energy and focus, particularly on harder training days or mentally demanding work periods.

3-6 months: Reassess with body composition data if you have it. Compare lean mass, strength metrics, and subjective markers against your baseline.

Product selection: Look for creatine monohydrate standardized to Creapure. It's a bit more expensive than generic monohydrate. Not dramatically more expensive. Worth the quality assurance for a supplement you're taking every day indefinitely.

Why this matters for longevity

Thurlow frames creatine as a longevity intervention, not just an athletic one. And the case holds up.

Sarcopenia is one of the strongest predictors of mortality in older adults. Muscle is metabolically active tissue. Loss of it accelerates insulin resistance, reduces physical resilience, increases fall risk, and correlates with cognitive decline. Creatine is one of the most evidence-backed tools for slowing that loss when combined with resistance training.

Bone fractures, particularly hip fractures in women over 65, are devastatingly correlated with mortality and loss of independence. Creatine's effects on bone geometry, independent of bone mineral density, add a layer of protection that's rarely discussed in bone health conversations.

Cognitive decline is the aging concern that most adults fear most. Creatine's role in brain energy metabolism, its demonstrated effects on mood, memory, and reaction time, and its particular relevance during the hormonal shifts of menopause make it one of the few supplements that plausibly addresses this from a mechanism level rather than just an association level.

The biological age calculator can give you a starting benchmark across several of these domains before you begin any intervention.

Frequently asked questions

What creatine brand does Cynthia Thurlow recommend?

She co-created a Creapure-grade creatine monohydrate through MD Logic Health. She also previously mentioned Con-Cret in earlier content. More recently she has a product under her Midlife PAUSE branding. The through-line across all of these is Creapure-grade creatine monohydrate rather than any specific proprietary form.

What dose does Cynthia Thurlow recommend for creatine?

She recommends 3-5 grams per day for most adults. She suggests starting at 1.5-2.5 grams for the first few weeks if you're new to it or sensitive, then increasing to the full dose. She does not recommend loading phases.

Does Cynthia Thurlow recommend creatine for women who don't exercise?

Her primary recommendation is always to pair creatine with resistance training for muscle and bone benefits. But she acknowledges the cognitive benefits are relevant even for people who aren't actively training. Brain creatine stores matter independently of muscle use.

When does she say to take creatine?

Inside your eating window, with a meal, at a consistent time daily. She doesn't prescribe pre- or post-workout timing as important. Consistency of daily dosing matters far more than timing within the day.

What does she say about creatine and weight gain?

She addresses this directly and consistently. Any weight increase in the first few weeks is intramuscular water retention, not fat. The water is going into muscle cells, which is a sign the creatine is working. The scale number may increase slightly. Body composition, the ratio of lean mass to fat, improves.

How long does it take for creatine to work?

She's consistent with the evidence here: tissue saturation takes 3-4 weeks at standard doses. Meaningful performance improvements typically appear at weeks 4-8. The most significant changes in body composition and strength show up over 3-6 months of consistent use combined with resistance training.

Can creatine help with menopause symptoms?

The evidence supports specific symptom improvements: mood, reaction time, and cognitive function show consistent improvement in clinical trials on perimenopausal and menopausal women. The muscle and bone benefits are the most robustly studied. For hot flashes or vasomotor symptoms specifically, creatine is not the tool. It targets the metabolic and structural changes of menopause, not the thermoregulatory ones.

Related guides

• Creatine gummies vs powder: which form actually works?
• Instantized creatine: what the processing changes about absorption
• Berberine and inositol: the insulin resistance stack explained
• Creatine calculator: find your optimal daily dose
• Supplement interaction checker

Sources

• Creatine Supplementation in Women's Health: A Lifespan Perspective
• Creatine and Bone Health in Postmenopausal Women: 2-year RCT

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Thurlow's creatine recommendation comes down to this: women start with less, lose more, and have the most to gain. The research backs that framing. Three to five grams of Creapure-grade creatine monohydrate daily, taken with a meal, consistently, for months.

If you want a protocol built around your specific goals, age, and current stack, the WinAging protocol builder can put one together in minutes based on your actual data.