Preserving fertility means protecting your ability to have biological children in the future, whether you’re delaying parenthood by choice, facing a medical treatment that could affect your reproductive system, or simply want to keep your options open. The most effective steps depend on your age, sex, and circumstances, but they fall into two broad categories: freezing eggs, sperm, or embryos now, and making lifestyle choices that protect your reproductive health over time.
Why Age Is the Single Biggest Factor
For women, fertility preservation is a race against the biological clock in a very literal sense. The number and quality of eggs decline steadily from the early 30s onward, and no supplement or lifestyle change can reverse that trajectory. A modeling study in Fertility and Sterility found that egg freezing before age 34 gave women a greater than 74% probability of a live birth from those eggs. That probability dropped gradually with each passing year, falling to roughly 52% at age 37 and just 26% after age 40.
The same study found that the biggest advantage of freezing over doing nothing appeared at age 37, where women who froze eggs had a nearly 30 percentage point higher chance of a live birth compared to those who relied on natural conception later. Before age 30, the benefit of freezing was minimal (only a 2.6% to 7.1% increase) because most women in that age range still conceive naturally when they’re ready.
For men, sperm quality also declines with age, though more gradually. Sperm counts, motility, and DNA integrity all worsen after 40, increasing the time to conception and the risk of genetic conditions in offspring. The window is wider, but it isn’t infinite.
Egg Freezing: What to Expect
Egg freezing (oocyte cryopreservation) involves about 10 to 14 days of hormone injections to stimulate your ovaries, followed by a short outpatient retrieval procedure under sedation. As of early 2025, the average cost of a single egg freezing cycle in the United States is around $14,364, including medications. Annual storage fees vary by clinic but typically run a few hundred dollars per year on top of that. Many people need more than one cycle to bank enough eggs for a reasonable chance of success, especially after 35.
Frozen eggs survive the thawing process about 79% of the time, compared to about 90% for frozen embryos. Despite that gap in thaw survival, the ultimate live birth rates are nearly identical: 25% per transfer cycle for thawed eggs and 25.1% for thawed embryos. So the choice between freezing eggs and freezing embryos often comes down to personal circumstances. Egg freezing doesn’t require a sperm source at the time of freezing, which makes it the more flexible option for people without a partner.
Embryo Freezing: When It Makes Sense
If you have a partner or are comfortable using donor sperm, embryo freezing offers one practical advantage: embryos can be genetically tested before they’re stored, so you know in advance which ones are chromosomally normal. This can improve your odds per transfer when you’re ready to use them. The freezing and thawing process is also slightly more forgiving for embryos, with thaw survival rates above 90% using modern vitrification techniques (compared to about 71% for eggs vitrified the same way).
The process is identical to egg freezing on the front end. You go through the same hormone stimulation and egg retrieval, but instead of freezing the eggs immediately, they’re fertilized in the lab first. The resulting embryos are frozen a few days later. Costs are similar to egg freezing plus the added fees for fertilization and, if desired, genetic testing.
Sperm Freezing: Simple and Affordable
Sperm banking is the most straightforward fertility preservation option. You provide one or more semen samples at a clinic or specialized facility. Each sample is split into several vials and stored across multiple tanks to reduce risk. The entire collection process can be completed in a single visit, though providing two or three samples on separate days is common to ensure adequate supply.
Storage costs range from about $100 to $500 per year, making it dramatically cheaper than egg or embryo freezing. Frozen sperm remains viable for decades. If you’re a man facing cancer treatment, surgery, or any medical therapy that could impair sperm production, banking samples beforehand is one of the simplest and most effective precautions you can take.
Fertility Preservation Before Cancer Treatment
Chemotherapy, radiation to the pelvic area, and certain surgeries can permanently damage eggs, sperm, or reproductive organs. Updated clinical guidelines from the American Society of Clinical Oncology recommend that every person diagnosed with cancer be counseled about reproductive risks at diagnosis and referred to a fertility specialist before treatment begins.
For women, the established options include egg freezing, embryo freezing, and ovarian tissue cryopreservation. Ovarian tissue freezing involves surgically removing and freezing thin strips of ovarian tissue, which can later be transplanted back into the body to restore both fertility and hormone production. More than 140 live births from this technique have been documented worldwide, and the American Society for Reproductive Medicine classified it as non-experimental for adults in 2019. For girls who haven’t yet gone through puberty, ovarian tissue freezing is the only feasible option, though it’s still considered investigational in pediatric patients.
For men, sperm cryopreservation before treatment is standard. If a man or adolescent boy can’t produce a semen sample, sperm can be surgically extracted from the testicle.
How Your Weight Affects Fertility
Body weight has a measurable impact on reproductive function in both directions. Women with a high BMI respond more poorly to ovarian stimulation, producing fewer follicles and fewer retrievable eggs. Fertilization rates tend to be lower, and embryo quality is worse, particularly in women under 35 who are obese. Higher doses of stimulation medications are needed to achieve the same response, which drives up costs and physical side effects.
Being significantly underweight also disrupts fertility by suppressing the hormonal signals that trigger ovulation. For both men and women, maintaining a BMI in the normal range (roughly 18.5 to 24.9) supports optimal reproductive health. Even modest weight changes in either direction can shift hormone balance enough to make a difference.
Supplements That May Help Egg Quality
Coenzyme Q10 (CoQ10) is the most studied supplement for egg quality. It supports the energy-producing machinery inside cells, which becomes less efficient in eggs as women age. For women with normal ovarian reserve, 200 mg daily for about a month before ovarian stimulation has been shown to improve oocyte maturation rates and early embryo quality. For women with diminished ovarian reserve, a higher dose of 600 mg daily for at least 60 days appears more effective at improving the ovaries’ response to stimulation.
Some evidence suggests that combining CoQ10 with DHEA (a mild androgen precursor) can increase the number of developing follicles visible on ultrasound and improve ovarian responsiveness. However, this combination hasn’t been shown to improve final clinical outcomes like pregnancy rates, so expectations should be measured. Talk to a reproductive endocrinologist before starting DHEA, as it’s a hormone with potential side effects.
Reducing Exposure to Reproductive Toxins
Endocrine disruptors are chemicals that mimic or interfere with your body’s hormones, and they’re found in everyday products. Bisphenol A (BPA), commonly present in plastic containers, can liners, and thermal receipt paper, has been shown to disrupt normal follicle development even at low doses. Phthalates, found in fragranced personal care products, vinyl flooring, and soft plastics, alter follicle growth and increase cell death in ovarian tissue.
Practical steps to reduce exposure include switching to glass or stainless steel food containers, avoiding heating food in plastic, choosing fragrance-free personal care products, and filtering drinking water. These won’t reverse age-related decline, but they remove an unnecessary drag on your reproductive system.
Checking Your Fertility Baseline
If you’re considering fertility preservation, a baseline assessment gives you critical information about your starting point. For women, the two key tests are Anti-Müllerian Hormone (AMH), a blood test that estimates your remaining egg supply, and an antral follicle count (AFC), an ultrasound that counts the small follicles developing in your ovaries that cycle.
AMH levels vary widely by age. In women aged 20 to 25, normal values range from roughly 10.6 to 55.6 pmol/L. By ages 36 to 40, the normal range drops to 2.2 to 48.9 pmol/L, and by 46 to 50, it falls to 0.14 to 5.1 pmol/L. A low AMH for your age doesn’t mean you can’t conceive, but it does suggest a smaller egg reserve and may make freezing more urgent if you’re planning to delay parenthood. For men, a standard semen analysis measuring count, motility, and morphology provides a clear picture of current fertility status.
Planning for the Cost
Fertility preservation is expensive, and insurance coverage varies widely. Some states mandate coverage for egg freezing when it’s medically indicated (before cancer treatment, for example), but elective freezing is rarely covered. A single egg freezing cycle at around $14,000 plus a few hundred dollars per year in storage can add up quickly, especially if multiple cycles are needed.
Many clinics offer payment plans or partner with fertility-specific lenders. Some employers, particularly in tech and finance, now include egg freezing as a benefit. Sperm banking is far more accessible financially, with the main ongoing cost being annual storage. Whatever your situation, getting a fertility assessment early gives you time to plan, both biologically and financially, before your options narrow.