What Every Woman Over 40 Should Know About Creatine

Creatine is a natural compound made from three amino acids: arginine, glycine and methionine. 

Your muscles and brain store creatine as phosphocreatine, a rapidly accessible source of cellular energy – helping to regenerate ATP (adenosine triphosphate), the body's primary energy currency.

Your body produces creatine naturally in the liver and kidneys, and modest amounts are found in red meat and seafood. The challenge is that dietary sources rarely provide optimal amounts – particularly for women, who naturally have lower muscle creatine stores than men and whose creatine metabolism is directly influenced by hormonal status.

This is a gap that supplementation can meaningfully address.

The relationship between creatine and female biology becomes significantly intertwined from the mid-thirties onwards – and particularly so during perimenopause.

As oestrogen levels begin to fluctuate during perimenopause and naturally decline in menopause, women frequently notice that maintaining strength feels harder, brain fog creeps into the workday, and recovery takes longer than it used to. These experiences are not imagined – they reflect real, measurable shifts in muscle physiology, cognitive energy metabolism and hormonal balance. shifts that creatine's mechanisms are particularly well-suited to support.

A 2025 review found that creatine may help women improve muscle strength and exercise performance – and that's especially important during perimenopause, when ageing and hormonal changes can make it harder to maintain muscle mass.

Muscle Strength and Body Composition

Perhaps the best-established benefit of creatine in women over 40 is its role in preserving lean muscle mass – a concern that intensifies with hormonal transition.

Early studies demonstrated the benefits of creatine on exercise performance in women, and a 2021 comprehensive review by Smith-Ryan and colleagues reported a positive effect on strength, exercise and sports performance, as well as potential benefits on bone health when combined with resistance training in post-menopausal women.

This matters beyond aesthetics. Muscle mass is a primary determinant of metabolic rate, insulin sensitivity, fall risk and long-term functional independence – all of which become increasingly relevant in midlife and beyond. 

Cognitive Function and Brain Energy

The cognitive benefits of creatine are among the most exciting developments in recent research – and arguably the most relevant for women navigating the brain fog that many experience during hormonal transition.

Because creatine crosses the blood-brain barrier to directly support mitochondrial function, it has been shown to improve taxing cognitive tasks, with studies highlighting its effectiveness in enhancing memory processing and mitigating mental fatigue – acting as a crucial energy buffer during times of hormonal change.

The most directly relevant evidence comes from the landmark CONCRET-MENOPA trial – a randomised, double-blind, placebo-controlled study published in 2025 that looked specifically at perimenopausal and menopausal women between 40 and 60. Over eight weeks, women taking a moderate daily dose of a highly soluble creatine formulation saw meaningful decreases in reaction times compared to placebo, along with measurable increases in brain creatine levels – with a trend toward improved mood stability also observed.

This is the kind of targeted, female-specific research the field has needed – and its findings significantly strengthen the case for creatine as a cognitive support strategy during the menopausal transition.

Mood and Emotional Resilience

Low energy and mood swings are frequently reported during perimenopause. By stabilising brain energy levels, preclinical and clinical evidence has reported positive effects from creatine supplementation on mood and emotional resilience – particularly noting reductions in depressive symptoms and support for mental wellbeing in women navigating reproductive milestones.

A 2025 randomised controlled trial found that even low doses of creatine hydrochloride led to measurable improvements in brain energy, focus and emotional balance, with no identified adverse effects.

Bone Health

Creatine's relationship with bone density is an emerging area of particular relevance to women post-menopause. The 2021 Smith-Ryan review highlighted advances in research for the potential benefits of supplementation on bone health when combined with resistance training in post-menopausal women – a finding consistent with creatine's broader role in supporting the musculoskeletal system during hormonal transition.

The persistent myth that creatine causes unwanted bulk or significant water retention is one of the primary reasons women have historically avoided it – and it deserves to be addressed directly.

Creatine pulls water inside the muscle cell – a physiological response that enhances cellular health. Clinical data clarifies that this is an intracellular, rather than extracellular, response – and none of the doses tested in women-specific clinical trials caused significant increases in body weight.

The bloating associated with creatine in older studies reflected loading protocols – high doses taken for short periods – that are neither necessary nor current practice. Lower, consistent daily doses of creatine monohydrate or the more soluble creatine hydrochloride formulations produce the same cellular and cognitive benefits without the water retention concerns.

If you are considering adding creatine to your routine, or are already taking it, understanding how our clinically proven Morning & Night formula interacts with creatine's mechanisms helps you maximise the benefits of both.

Arginine and Glycine – The Creatine Precursors

Creatine is synthesised in the body from three amino acids: arginine, glycine and methionine. Morning & Night's Night formula contains L-arginine and L-glutamine – two amino acids that support not only cellular repair and growth hormone activity, but also the internal creatine synthesis pathway. By providing these precursors consistently as part of a circadian-timed formula, Morning & Night can support your body's own creatine production capacity alongside any exogenous supplementation.

CoQ10 and Acetyl-L-Carnitine – Amplifying Cellular Energy

Creatine's primary mechanism is cellular energy production – specifically, the regeneration of ATP. Morning & Night's Morning formula contains CoQ10 and acetyl-L-carnitine, two nutrients that can support mitochondrial ATP production through complementary pathways to creatine. Where creatine replenishes the phosphocreatine energy system for rapid energy demands, CoQ10 and acetyl-L-carnitine support the sustained mitochondrial energy production that powers everything from cognitive function to immune activity throughout the day.

Together, these mechanisms support a more comprehensive approach to cellular energy than either provides independently.

Magnesium – Supporting Creatine Uptake

Emerging research suggests that magnesium plays a role in creatine metabolism, as the active form of creatine in the cell is magnesium-creatine phosphate. Morning & Night's Night formula contains magnesium – supporting not only sleep architecture and nervous system relaxation, but potentially the cellular environment in which creatine operates most effectively.

Taurine – Overlapping Cognitive and Cardiovascular Support

Morning & Night's Morning formula contains taurine – an amino acid that supports cognitive stamina and cardiovascular function through mechanisms that overlap with creatine's brain energy and mood benefits. For women specifically seeking cognitive and emotional resilience support during midlife, the combination of creatine and taurine addresses the neurological energy demands of this life stage from multiple angles simultaneously.

This article contains EU-authorised health claims where stated. Morning & Night and Energy & Focus are food supplements and are not intended to diagnose, treat, cure or prevent any disease. For informational purposes only.