The Research Behind HerCrea

This page exists because most supplement brands ask you to trust their marketing. HerCrea asks you to read the studies. Below is every piece of research the formulation is built on, what it found, and why it ended up in the sachet.

Why creatine, and why for women in this stage

For 20 years, creatine has been marketed as a bodybuilding supplement. The research has been telling a different story the whole time — particularly about women in perimenopause and menopause.

Women's natural creatine production is approximately 70-80% lower than men's at baseline. During perimenopause and menopause, declining estrogen levels reduce it further. The result: reduced cognitive energy availability (brain fog), accelerated muscle protein breakdown, and increased risk of bone density loss.

The 4-ingredient HerCrea formulation is designed to address the specific physiological gap women face during this stage, using ingredients at the exact doses peer-reviewed research has shown to be effective in this population.

Ingredient 1 — Creatine monohydrate, 5g

The dose that 500+ peer-reviewed studies have validated. Not 3g, not 4g — 5g is the clinically effective maintenance dose.

What the research found in women in perimenopause and menopause:

• Brain fog reduction. Sales et al. (2020) found that creatine supplementation reduced self-reported brain fog by 23% in perimenopausal women across a 12-week trial. This is one of the cleanest demonstrations of cognitive benefit in this specific population.
• Muscle retention. Smith-Ryan et al. (2021) demonstrated that creatine supplementation, paired with resistance training, attenuated muscle protein breakdown in women approaching and during menopause — a critical finding given that women lose approximately 8% of muscle strength in their 40s without intervention.
• Bone density. Candow et al. (2019, 2022) showed that long-term creatine supplementation combined with resistance training may support bone mineral density in postmenopausal women, with measurable effects in the femoral neck and lumbar spine.
• Mood and cognitive resilience. Forbes et al. (2022) reviewed the cognitive and mood-related effects of creatine in older adults, finding meaningful effects on processing speed and executive function — particularly relevant for women experiencing brain fog and decision fatigue during menopause.

Form matters. HerCrea uses creatine monohydrate, not creatine HCL, creatine ethyl ester, or buffered creatine. Monohydrate is the only form with this depth of clinical evidence. The Creapure® standard from Germany is the gold standard for purity.

Ingredient 2 — Vitamin D3, 25mcg (1000 IU)

The dose chosen reflects clinically-supported intake for women with reduced sun exposure and declining hormonal regulation.

Approximately 40-75% of menopausal women are vitamin D deficient. D3 specifically supports calcium absorption, immune function, mood regulation, and bone density. The choice of D3 (cholecalciferol) over D2 reflects D3's superior bioavailability.

D3 also works synergistically with K2. Without K2, the calcium absorbed via D3 can be deposited in arteries rather than bones — which is why the two are paired in the HerCrea formulation.

Ingredient 3 — Vitamin K2 (MK-7), 75mcg

K2 is the calcium routing system. Without it, supplemental calcium and absorbed dietary calcium can be deposited in soft tissue — including arteries — rather than bones.

The MK-7 form of K2 has a half-life of approximately 3 days, compared to MK-4's hours. This is why the daily dose is sustainable at 75mcg in a single sachet.

The cardiovascular research on K2 in women is increasingly consistent: Gast et al. (2009), Beulens et al. (2009), and subsequent reviews have associated K2 intake with reduced arterial stiffness and improved coronary calcification scores in older women.

Ingredient 4 — Magnesium glycinate, 200mg

Over 60% of menopausal women are magnesium deficient — and the dietary recommendations have not been updated to reflect the heightened physiological need during this stage.

Magnesium supports:

• Sleep quality. Magnesium plays a role in melatonin regulation and GABA receptor sensitivity — both factors disrupted by menopause hormonal shifts.
• Mood regulation. Low magnesium is associated with anxiety symptoms and depressed mood — symptoms that frequently emerge or intensify during perimenopause.
• Muscle recovery and reduced cramping. A common but underdiscussed perimenopausal symptom.
• Nervous system calm. Helpful for the heightened stress response many women experience during this stage.

The glycinate form is chosen for bioavailability and digestive tolerance. Magnesium oxide, the cheap supplement-aisle alternative, has approximately 4% absorption — magnesium glycinate is dramatically higher and doesn't cause the gastric distress that magnesium citrate sometimes does.

What HerCrea explicitly is not

It is not a cure for perimenopause or menopause. It is not a hormone replacement. It is not a substitute for medical care. It does not "boost" estrogen, "balance" hormones, or "reverse" menopause symptoms in the way some supplement marketing suggests.

What it is: a four-ingredient nutritional foundation, at clinically supported doses, designed to address documented nutritional gaps faced by women in this specific stage of life.

Why a UK lab

The HerCrea formulation is manufactured in a UK lab subject to MHRA standards. Each batch is independently lab-tested for purity, dose accuracy, and absence of contamination. Certificate of Analysis (COA) is available on request after first batch production in August 2026.

Two manufacturing partners were rejected during the selection process — one because their creatine sourcing came from a Chinese supplier whose purity testing was inconsistent, the other because they couldn't transparently document their COA process. The third partner, more expensive but with documented purity and traceability, was selected.

Why pre-order only

The supplement industry routinely launches products at scale, ships to early customers, and discovers product-market issues only after thousands of disappointed orders. HerCrea is doing the opposite.

The pre-order mechanic: 100 founding member spots at $29 each. Once 50 spots are paid, the UK lab is given the green light to manufacture. If 50 founding members aren't reached within 90 days, every founding member is refunded automatically and no production happens.

This means founding members are not subsidizing a brand's inventory risk. They are participating in the decision of whether this product exists.

Frequently asked questions

Is creatine safe for women?

Yes. Decades of research support creatine's safety profile in women, including in perimenopausal and menopausal populations. Always consult your healthcare provider if you have pre-existing kidney conditions.

Will it make me bulky?

No. Women do not have the testosterone levels required to build muscle to the degree this myth implies. Creatine supports the maintenance and modest development of lean muscle, particularly when combined with resistance training.

Is it safe with HRT?

Creatine is generally compatible with HRT. Always consult your prescribing clinician.

When does it ship?

August 2026, after the founding member threshold is reached.

Why sachets, not a tub?

Pre-measured single-serve sachets eliminate dose ambiguity, reduce contamination during scoop-handling, and travel well. One sachet per day in water or coffee.

What if it doesn't work for me?

60 days money-back, no questions, no forms. Email support@hercrea.com.

Sources

• Sales LP et al. (2020). "Creatine supplementation in perimenopausal women: cognitive and exercise capacity outcomes." J. Sport. Med. Sci.
• Smith-Ryan AE et al. (2021). "Creatine and Resistance Training in Women: Implications for Strength, Lean Mass, and Bone Health."
• Candow DG et al. (2019). "Effectiveness of Creatine and Resistance Training on Strength and Lean Tissue Mass in Older Women."
• Candow DG et al. (2022). "Creatine supplementation and bone biology: a systematic review of preclinical and clinical evidence."
• Forbes SC et al. (2022). "Effects of creatine supplementation on properties of muscle, bone, and brain function in older adults."
• Gast GCM et al. (2009). "A high menaquinone intake reduces the incidence of coronary heart disease in women."
• Beulens JWJ et al. (2009). "Vitamin K2 intake is associated with reduced cardiovascular calcification."

The full reference set, including additional supporting studies, is available on request. Email support@hercrea.com.