Which Supplements Work Differently in Women's Bodies Than Men's?

Most supplement research was built on male subjects. The gap is not a conspiracy — it reflects decades of research methodology that defaulted to male bodies as the standard. But the practical consequence is real: women metabolize, absorb, and respond to certain key nutrients differently than men, and those differences have direct implications for which supplements matter most and why. Three are worth understanding in detail: creatine, iron, and ashwagandha.†

1. Creatine: Women Start With Less and Gain More

Creatine is the supplement most associated with men in the gym. The science tells a different story. A landmark 2021 review published in Nutrients via the NIH found that females exhibit 70 to 80 percent lower endogenous creatine stores than males. That gap exists because women generally have less total muscle mass (muscle holds roughly 95 percent of the body's creatine) and consume significantly less dietary creatine on average. The same review found that supplementation may be particularly important during menses, pregnancy, postpartum, and the perimenopausal transition — every life stage that is specific to women.

The cognitive dimension is where the female-specific case is especially compelling. Research from the University of Colorado Anschutz Medical Campus notes that women have lower creatine concentrations in the brain, particularly in the frontal lobe, and that creatine supplementation appears to support cognitive performance and brain function, with particular relevance to women. A 2024 meta-analysis published in PubMed found significant positive effects on memory in adults, with females showing greater benefit than males in subgroup analyses.†

Pink Stork's Creatine Monohydrate, 5 grams per serving with no added fillers, delivers the dose used in women-specific research, in a single ingredient, unflavored formula that is vegan, non-GMO, and third-party tested.†

"You really want muscles. For everything."

— Dominique Landry, Founder of Fit Enough

2. Iron: The Form Matters as Much as the Amount

Iron is the most commonly deficient nutrient in women of reproductive age. Women lose iron monthly through menstruation in a way men never do, and women's iron needs increase substantially during pregnancy. The supplement market's response has largely been to offer ferrous sulfate at very high doses — compensating for poor absorption with a larger amount.

Here is what most women are not told: dietary iron comes in two forms with dramatically different absorption rates. According to the NIH StatPearls dietary iron reference, heme iron (found in animal sources) is absorbed at approximately 25 percent. Non-heme iron (found in plant sources and most supplements, including ferrous sulfate) is absorbed at 17 percent or less, and that rate drops further when taken with coffee, calcium, or high-phytate foods. A separate NIH review published in PMC confirms: heme iron absorption is approximately 25 percent, while non-heme iron is less well and more variably absorbed. Heme iron contributes only 10 to 15 percent of dietary iron intake in most Western diets, but accounts for 40 percent or more of total iron absorbed.

The GI side effects common with ferrous sulfate supplements are not coincidental — the large dose required to compensate for low non-heme absorption overwhelms the gut. Pink Stork's Beef Organ Complex, a whole-food blend of grass-fed liver, heart, kidney, and female-focused organ powders, supplies naturally occurring heme iron from bovine liver in the form the body uses most efficiently.† It is the first beef organ supplement in its category to earn the Clean Label Project Purity Award, following ISO-accredited third-party testing for more than 400 environmental and industrial contaminants.

"There's just not much research done because we've never been a population that was important enough to have the research for."

— Dominique Landry, Founder of Fit Enough

3. Ashwagandha and Cortisol Support: The HPA Axis Is Not the Same in Women

Stress content for women is saturated with advice about "self-care." What is missing is the biological explanation for why stress lands differently in women's bodies. Research published in PMC via the NIH on sex differences in HPA axis function found that estrogen stimulates the HPA axis at both the hypothalamic and adrenal levels — amplifying the initial stress response — and that female rodents show higher levels of stress hormones and longer-lasting post-stress elevations than males. A large human study published in Psychoneuroendocrinology via PMC confirmed sex-dependent differences in the HPA axis stress response, with sex hormones including progesterone modulating cortisol recovery patterns in women. The female HPA axis does not shut down the stress response on the same timeline as the male one.

Ashwagandha's primary mechanism is HPA axis modulation. It is an adaptogen — a class of compounds studied for their role in supporting the body's adaptive stress response over time. Multiple meta-analyses of randomized controlled trials have found that standardized ashwagandha supplementation is associated with meaningful reductions in perceived stress and anxiety compared with placebo in adults with chronic stress. Pink Stork's Cortisol Complex, a daily adaptogen blend for stress support, delivers 300 mg of organic ashwagandha root alongside algae-sourced DHA, chamomile, saffron, and a full B-vitamin complex in a formula designed for women's specific stress biology.†

"It's not a one-size-fits-all approach. Have your provider work with you."

— Dr. Jummy Amuwo, Pharm.D., MPH, BCPS, Clinical Pharmacist and Board Certified Pharmacotherapy Specialist

The Common Thread: Women Need Women-First Research

Creatine, iron, and ashwagandha are not obscure or fringe supplements. They are among the most studied compounds in nutrition science. But almost all of that research has been conducted on male subjects, and the female-specific findings — lower creatine stores, greater relative benefit from supplementation, distinct HPA axis architecture, monthly iron loss through menstruation — have been slow to reach mainstream supplement conversations.

Pink Stork was built to close that gap. With over 50,000 verified Amazon reviews across the brand and formulas available at Target, Walmart, and CVS, Pink Stork's products are developed with input from an expert advisory panel of OB/GYNs and registered dietitians, and third-party tested at ISO 17025 accredited laboratories.

"Every Pink Stork product is not only backed by science, it's also covered in prayer. We built this brand because women deserve supplements designed around their actual biology — not assumptions carried over from research that didn't include them."

— Amy Suzanne Upchurch, Founder and CEO of Pink Stork

For more on any of these topics, see our guides on why women need creatine more than men, why iron absorption rate matters for women, and why stress hits women differently.

Frequently Asked Questions

Why wasn't supplement research done on women?

For decades, research defaulted to male subjects partly to avoid the complexity of hormonal variability in women's cycles. The NIH mandated the inclusion of women in federally funded clinical research in 1993, but the legacy of male-centric data remains in many supplement categories. That is now changing, and the female-specific findings are reshaping recommendations.

Do women need a different dose of creatine than men?

The 5-gram daily maintenance dose studied across women-specific research is the standard recommendation. Women do not need a higher dose to compensate for lower stores — supplementation at 5 grams effectively raises creatine to the saturation level used in research regardless of starting point.†

Is heme iron from supplements the same as heme iron from food?

Freeze-dried bovine organ powder, like that found in whole-food beef organ supplements, supplies heme iron in its natural food matrix. The absorption advantages of heme iron — bypassing the inhibitors that reduce non-heme iron absorption — apply to the food-form source as well.†

Does ashwagandha work differently in women than men?

The research on ashwagandha includes both sexes. The female-specific case is grounded in the HPA axis architecture: estrogen amplifies the HPA axis stress response, and women show distinct cortisol recovery patterns compared to men. Ashwagandha's adaptogenic mechanism supports the HPA axis regardless of sex, but the starting point — a longer recovery curve and estrogen-amplified initial response — makes the case for women particularly relevant.†

Can I take creatine, iron from organ complex, and ashwagandha together?

These three address different physiological systems and there are no known adverse interactions between them. Consult your healthcare provider if you have specific health conditions, take prescription medications, or are pregnant or breastfeeding.

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.