How Women Can Improve Their Fertility & Hormone Health | Dr. Natalie Crawford

Fertility is an important indicator not just of reproductive potential, but also of a woman's broader metabolic and hormonal health. Dr. Natalie Crawford and Dr. Andrew Huberman highlight how reproductive status can offer insight into overall wellbeing and longevity, and advocate for proactive, accessible fertility testing to better inform women’s health decisions.

Fertility Indicates Broader Metabolic and Hormonal Health

Infertility is not merely a roadblock to parenthood—it signifies elevated risks for metabolic syndrome, cancer, heart attack, stroke, and even early mortality. Dr. Crawford emphasizes that infertility rarely causes these conditions directly, but serves as an early red flag for underlying issues like chronic inflammation or [restricted term] resistance, which drive long-term health outcomes.

The process of ovulation and menstrual regularity signals proper hormonal production, immune function, and cellular health throughout life. Ovulatory function depends on the interplay between egg quality, metabolic status, and hormone signals (e.g., estrogen and progesterone). As women age, or if metabolic health declines due to inflammation, [restricted term] resistance, or obesity, egg quality may deteriorate due to compromised mitochondrial function and increased DNA damage.

Identifying ovulation and tracking its patterns—beyond simply monitoring periods—reveals important nuances. Subclinical dysfunctions, such as a shortened luteal phase (less than 11 days), indicate early ovulatory disorders that standard cycle tracking can miss. Understanding the timing of menopause and recognizing features like irregular cycles further inform assessments of overall health and risk factors.

Dr. Crawford also shares her experience with unexplained infertility due to undiagnosed celiac disease, illustrating how chronic systemic issues manifest first as reproductive difficulties. She stresses that listening closely to one’s reproductive signals enables early self-advocacy and intervention.

AMH Testing Should Be Routine for all Women Considering Motherhood

Anti-Müllerian hormone (AMH) testing provides a practical, accessible measure of ovarian reserve—the quantity (not quality) of remaining eggs. Higher AMH levels reflect greater egg supply, while lower levels may flag diminished ovarian function and prompt further investigation.

AMH testing is a simple blood test, costing around $79 out-of-pocket and available through clinicians, fertility clinics, and direct-to-consumer labs. Unlike egg quality (which hinges on genetics and cellular competency), AMH only quantifies the egg pool. Nevertheless, this information can dramatically impact a woman’s approach to family planning. Knowing ovarian reserve helps women decide whether to conceive sooner, freeze eggs, use donor sperm, or adjust their timelines and expectations with autonomy. Importantly, Dr. Crawford argues that care providers should facilitate access to AMH testing without gatekeeping or presupposing what women will do with this information.

Low AMH frequently signals treatable, underlying conditions such as autoimmune diseases (e.g., Hashimoto’s thyroiditis), [restricted term] resistance, endometriosis, or damage from smoking. Identifying these causes enables interventions—like thyroid hormone replacement or inflammation reduction—that may preserve fertility and improve general health. Women who receive early AMH data can proactively consult specialists, explore options, and avoid the emotional toll of discovering diminished reserve only after failed conception attempts.

Dr. Crawford and Dr. Huberman urge widespread education so women realize the value of AMH monitoring as part of preventive care—not just after encountering fertility obstacles.

Age-related Fertility Decline E ...

Cultivating a lifestyle that reduces inflammation, incorporates anti-inflammatory foods, and avoids certain toxins is fundamental to extending ovarian lifespan and optimizing hormone function. The combination of sleep hygiene, cycle awareness, targeted exercise, and a nutrient-rich diet can significantly influence reproductive outcomes and hormonal balance.

Sleep Impacts Ovulation, Hormone Production, and Reproductive Capacity

Adequate sleep is crucial for reproductive health in both women and men. Sleep is when the body reduces chronic inflammation and lowers inflammatory markers. Conversely, inadequate sleep causes increased oxidative and cellular stress, and impairs hormonal release—specifically, the gonadotropins FSH and LH—which are secreted by the brain in the early morning. Disrupted or insufficient sleep dampens this hormonal response, directly impacting fertility. Evidence shows that women with poor sleep report double the infertility rate and retrieve fewer eggs during IVF cycles. For both partners, poor sleep reduces "fecundability," meaning it takes longer to conceive.

A stable physiology signaled through consistent sleep tells the brain it's safe to support pregnancy. The recommended amount is seven to nine hours nightly, with most women needing at least seven and a half, especially in the luteal phase when making progesterone, a process that demands physiological resilience. Not just sleep length but circadian regularity—going to bed and waking up at similar times—improves hormonal health, melatonin production, and supports optimal egg mitochondrial health.

Low-dose melatonin supplementation (1–3 mg, 30 minutes before bed) can help improve pregnancy odds and egg quality by supporting ovulation's natural anti-inflammatory processes. Women naturally produce melatonin during ovulation to counter ovarian oxidative stress. However, supplementation is typically unnecessary for those already sleeping well, and higher doses are not recommended.

Cycle Tracking Aids Detection of Hormonal Issues and Optimizes Conception Timing

Tracking the menstrual cycle is essential for uncovering hormonal imbalances and maximizing conception chances. The fertile window spans the five days prior to ovulation and the day of ovulation itself. Sperm can survive in the reproductive tract for up to five days, but probabilities of conception are highest—20 to 30%—on the two days before and the day of ovulation, dropping to zero immediately afterward.

Women are advised to discontinue hormonal birth control three to six months before attempting conception. This transition allows time to observe and learn personal ovulation patterns, making it possible to spot abnormalities such as anovulation or irregular cycles, which can then be investigated early rather than after prolonged unsuccessful attempts at conception.

Ovulation can be identified using several markers: basal body temperature, changes in cervical mucus, and other reproductive signs. Mastering this form of body literacy is key for pregnancy planning.

Resistance Training Reverses [restricted term] Resistance and Inflammation

Regular resistance training is a powerful intervention to improve fertility by countering [restricted term] resistance and systemic inflammation—both of which impair reproductive outcomes. Building skeletal muscle optimizes hormonal health and metabolic function, conferring benefits independent of weight loss.

When exercising during the menstrual cycle, it is important to adapt workout types to the body’s needs. After ovulation and during menstruation, avoid high-intensity exercise or interventions like cold plunges that significantly suppress inflammation, as the body requires some degree of inflammatory response for ovulation and implantation. Cold plunges and potent anti-inflammatory interventions should be avoided during conception attempts, as dampening the body’s acute inflammatory processes ...

Growing research highlights that exposure to various toxins and behavioral substances—including cannabis, nicotine, NSAIDs, endocrine-disrupting chemicals, and certain supplements—can diminish reproductive potential in both men and women.

Cannabis Negatively Affects Egg and Sperm Quality In a Dose-Dependent Manner

Both Andrew Huberman and Natalie Crawford stress the serious fertility risks associated with cannabis for men and women. For females, even cannabis use in the year before fertility treatment can decrease eggs obtained during egg retrieval by 25% and fertilization rates by 28%. Female cannabis users also face increased miscarriage rates and a lower probability of live birth. In men, cannabis is universally detrimental to sperm: it reduces sperm quantity and [restricted term], and it introduces DNA fragmentation in sperm, harming embryo development. Importantly, partners of cannabis-using males face significantly higher miscarriage rates. Clinical observations find that embryo development often halts at the early male-dependent stage in couples where the male secretly uses cannabis. Sperm quality is vital not only for fertilization but also for early embryonic programming and placenta formation, meaning paternal cannabis use carries latent risks such as earlier birth.

THC, cannabis’s psychoactive component, crosses the placenta directly. Edible forms contain the highest THC concentrations, posing profound risks both preconception and during pregnancy. Crawford makes clear: regardless of consumption method, any cannabis exposure undermines reproductive function and pregnancy outcomes.

Nicotine Impairs Reproductive Function and Accelerates Menopause Onset

Nicotine, whether from cigarettes, oral pouches, or other modalities, is detrimental for those trying to conceive. Crawford reports that nicotine disrupts the neural mechanisms that govern ovulation, fertility, and hormone responses. This is true for all delivery formats, including the increasingly popular oral nicotine pouches. Long-term cigarette smoking is uniquely potent; it shrinks ovarian reserve, accelerates menopause, and impairs egg quality. Growing research shows oral nicotine similarly disrupts egg quality and drastically suppresses sperm count.

Both experts classify nicotine and cannabis as completely unnecessary “behavioral toxins” for anyone seeking optimal fertility. Avoiding them is especially vital for individuals with infertility or who are older, to control modifiable risk factors in the reproductive environment.

Nsaids Prevent Ovulation Outside Menstrual Phases

Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, Advil, and Aleve present unintended fertility hazards. When taken around ovulation, NSAIDs block follicle rupture, so while the hormonal signature of ovulation occurs, no egg is released. As a result, women may think they are ovulating but are actually anovulatory. NSAIDs are considered safe only during the menstrual (bleeding) phase; women attempting to conceive should strictly avoid them during their follicular and luteal phases.

Endocrine-Disrupting Chemicals Impair Fertility Through Multiple Mechanisms

Plastics, microplastics, and related endocrine-disrupting chemicals like phthalates and BPA present a widespread but often overlooked threat to reproductive health. Crawford notes that microplastics accumulate in the ovary, impairing its ability to produce estrogen, ovulate, and support early pregnancy. Population studies consistently link higher exposures to these chemicals with longer times to conception, worse outcomes in IVF (fewer eggs retrieved, fewer embryos), reduced live birth rates, and lowered sperm quality. She references the Earth Study as robust evidence for these impacts.

Exposure is cumulative and typically arises from repeated contact with small amounts in many products. Everyday sources include food wrappers, plastic containers, and thermal receipt paper (which contains BPA). The highest risk occurs through occupational exposure, as with cashiers frequentl ...

A range of supplements and targeted medical interventions are showing growing promise in optimizing reproductive outcomes for both men and women. Below, each commonly discussed agent and intervention is detailed for its role, timing, and safety profile in fertility care.

Coenzyme Q10 and L-Carnitine Enhance Reproductive Cell Quality

Coenzyme Q10 (CoQ10) and L-carnitine have robust supporting data for their ability to enhance egg and sperm quality by supporting mitochondrial function and reducing oxidative stress. Natalie Crawford recommends CoQ10 supplementation beginning at least 60 days before conception, often termed ‘trimester zero,’ as egg and sperm maturation cycles require this span to reap mitochondrial benefits. However, CoQ10 is discontinued upon confirmed pregnancy due to insufficient safety data on its use during gestation, reflecting a cautious approach to avoid unnecessary exposures.

For men, L-carnitine is particularly emphasized for its benefits to sperm health. Supplementing with zinc and selenium is also cited as supportive for male factor fertility. For women, prenatal vitamins with folic acid, along with CoQ10, are strongly recommended in the preconception period for their proven effects on egg and embryo quality.

These supplements are universally recommended for those actively attempting conception due to their absence of significant risk and strong mechanistic evidence supporting mitochondrial health and antioxidant protection.

Vitamin D and Omega-3 Enhance Reproductive Function Through Various Mechanisms

Vitamin D and omega-3 fatty acids are highlighted for their clear association with improved reproductive outcomes. Vitamin D supports ovarian function, enhances the immune environment, and promotes implantation and pregnancy maintenance. Omega-3 fatty acids contribute to reduced inflammation and mitochondrial support and are crucial as cholesterol precursors for reproductive hormone synthesis. Natalie Crawford consistently recommends that those aiming to conceive supplement with both vitamin D and omega-3s for these wide-ranging benefits without significant risk.

Melatonin Aids Women With Inflammatory Conditions Affecting Fertility

Melatonin supplementation’s value is most apparent for women suffering from chronic inflammatory reproductive conditions such as endometriosis, autoimmune disease, unexplained infertility, or history of poor egg quality. Its antioxidant and anti-inflammatory properties may aid these specific cases, though melatonin is unnecessary for individuals already sleeping well and without such diagnoses. Low-dose melatonin (1–3 mg) can augment the natural melatonin rise during ovulation, further supporting ovarian antioxidative defenses.

Inositol Effectively Addresses [restricted term] Resistance in Polycystic Ovary Syndrome

For women with polycystic ovary syndrome (PCOS), inositol—particularly myo-inositol and d-chiro-inositol—is identified as a highly effective intervention. It works by decreasing [restricted term] resistance and inflammation, thereby improving ovulation and metabolic function. Inositol’s benefits reflect a targeted nutritional strategy for PCOS, with strong evidence supporting its routine use for ovulatory improvement in this population.

GLP-1 Agonists Reduce Inflammation in Endometriosis, Infertility

GLP-1 receptor agonists, traditionally recognized for supporting weight loss and [restricted term] resistance in PCOS, are emerging as promising agents for treating chronic inflammatory disease in fertility, especially endometriosis. Natalie Crawford describes prescribing low-dose GLP-1 for three months to women with known or probable endometriosis or unexplained infertility, reporting improvements in embryo numbers and laboratory outcomes, attributed to anti-inflammatory effects independent of weight loss. However, she stresses the importance of close physician monitoring, as excessive weight loss—especially in women without significant adiposity—can impair fertility by triggering hypothalamic suppression and luteal phase defects. In fertility applications, the goal is inflammation reduction, not weight loss, demanding experienced clinician oversight.

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Reproductive technology is rapidly changing family planning and fertility preservation. Advances in egg freezing, embryo banking, genetic screening, and evolving workplace fertility benefits open up more choices for individuals and couples but also raise ethical, access, and policy questions.

Egg Freezing Preserves Reproductive Potential Without Depleting Ovarian Reserve Through Natural Egg Loss

Women Lose Follicles Monthly Based On Egg Count; Ivf Matures Eggs Destined For Loss, Not Vault Reserves

A common misconception is that egg freezing or IVF accelerates menopause or reduces a woman’s future fertility by using up eggs from her "reserve." In reality, as Dr. Natalie Crawford explains, each month women lose a group of eggs (follicles) naturally, regardless of pregnancy, breastfeeding, or contraception status. The ovaries release one egg for ovulation, while the remaining eggs of the month's cohort die off—even before a girl’s first period, and this process continues every month throughout life.

IVF and egg freezing treatments do not tap the body’s deep reserve—often called the "vault"—but instead stimulate more of the month’s available eggs to mature. The hormone FSH (Follicle-Stimulating Hormone), given during IVF, prompts more eggs from that cohort to mature, enabling retrieval before they are lost. This does not decrease the vault reserve; it simply allows clinicians to save eggs otherwise destined for natural attrition.

[restricted term] Use Allows Multiple Egg Retrievals, Improving Ivf Outcomes Compared To Natural Cycle

With the advent of purified gonadotropins, it became possible to stimulate ovaries to mature multiple eggs in a cycle, greatly increasing the number of eggs retrieved during IVF or egg freezing. This boosts the number of embryos that can be generated from a single stimulated cycle, in contrast to earlier approaches that retrieved only one egg per cycle. Harnessing this physiology has dramatically improved IVF success rates and egg freezing potential.

Freezing Eggs Instead of Embryos Offers Options For Women With Ethical or Religious Concerns, but Requires Repeated Procedures

Eggs can be retrieved and frozen without creating embryos, an important option for women and couples with ethical or religious reservations about fertilization or embryo storage. Not every egg will fertilize or survive the culture process when later thawed and fertilized, so more cycles may be needed to obtain successful embryos compared to freezing embryos up front. Patients can choose to fertilize only as many eggs as they are comfortable with, leaving the rest frozen for future use, although this may involve extra costs and more procedures due to natural attrition in the process.

Embryo Banking Balances Ethics and Fertility Outcomes

Couples Concerned About Embryo Personhood Can Freeze Eggs and Fertilize Only What’s Needed, Leaving Extra Eggs Frozen

Some couples worry about the personhood or potential destruction of surplus embryos created during IVF. To address this, patients may choose to freeze eggs and fertilize only a limited number as needed—thawing and fertilizing, for example, two eggs at a time, while keeping others frozen. This tailored approach can align with specific ethical beliefs, though the process is less efficient, potentially more costly, and has a potentially lower success rate due to repeated thawing and fertilization, but it offers comfort to those with strong convictions.

Embryo Donation: An Ethical Pathway for Infertile Couples and Families With Excess Embryos

When families complete childbearing and have excess frozen embryos, donation is an available and meaningful option. Many patients now choose to donate remaining embryos to help other infertile couples start families, providing an ethical solution for those who have concerns about embryo storage or destruction and wish to "pay it forward."

Preconception Screening for Genetic Conditions Requires Informed Decision-Making

Genetic screening before conception is increasingly common, especially in IVF. For example, single-gene testing can identify embryos carrying monogenic diseases like Huntington’s. Patients can choose whether or not to know their own carrier status while still ensuring embryos selected do not carry disease, maintaining privacy and autonomy in sensitive cases. These advances enable those with family histories of severe genetic disease to make informed decisions about family planning.

Paternal Age Over 50 Linked To Increased Autism, Mutations, and Psychiatric Conditions in Offspring, but Population Risk Is Small

Advanced paternal age, especially after 50, is associated with an increased risk of de novo mutations, certain dominant genetic diseases, autism, and psychiatric conditions like schizophrenia in offspring. However, population-based risk remains small—most older fathers still have healthy children. Banking sperm at a younger age, if feasible, could reduce the risk, but life circumstances often require a balance between ideal biology and practical reality.

Banking Sperm Younger Y ...