Female Fertility

The female reproductive cycle.

The average menstrual cycle is around 28 days, though anywhere from 24 to 35 days is considered normal. The cycle has two main phases.

Follicular phase (Day 1 to ovulation). The body recruits follicles. One becomes dominant and releases a mature egg at ovulation.

Luteal phase (ovulation to Day 28). The uterine lining thickens to prepare for a potential embryo. If conception does not happen, the lining sheds and the cycle restarts.

Ovulation. A 24-hour window.

Ovulation typically happens around Day 14, though it varies. The egg survives for around 24 hours after release. Sperm can survive in the female reproductive tract for up to 5 days. That means the fertile window is roughly five days before ovulation through one day after.

Tracking ovulation (via cycle calendars, ovulation predictor kits, basal body temperature, or cervical mucus) significantly improves the odds of conception by timing intercourse during the fertile window.

Try our ovulation calculator →

What affects egg quality

Egg quality refers to the chromosomal and cellular health of egg cells. It is influenced by:

• Age. The biggest single factor.
• Mitochondrial energy. Egg cells need significant cellular energy to mature. Coenzyme Q10 is naturally present in cellular mitochondria; its role in oocyte energy metabolism has been examined in published research. Fertility Advance includes 300mg of natural ubiquinone CoQ10.
• Oxidative stress. Reactive oxygen species damage cells. Vitamin C, vitamin E, and selenium contribute to the protection of cells from oxidative stress.
• Nutritional status. Adequate folate, B12, vitamin D, and antioxidants.
• Hormonal balance. Supported by B6 (which contributes to the regulation of hormonal activity) and selenium (which contributes to normal thyroid function).

Common fertility concerns

Many women experience cycle irregularities, hormonal imbalances (PCOS, thyroid issues), or unexplained delays in conception. Most of these benefit from a combination of clinical guidance and optimised nutrition during the preconception window.

If you have been trying for 12+ months (or 6+ if you are over 35), it is worth speaking to your GP about a referral for fertility investigations.

How BioMirco supports female fertility

Fertility Advance is our high-strength formula for women 35+ or those who have been trying 12+ months. 300mg CoQ10, 800µg of active 5-MTHF folate, both methylated and adenosyl B12 forms, 26 nutrients in total.

Fertility Focus is built for early TTC and continues through the first trimester. Same active forms, calibrated doses, formulated to bridge preconception and early pregnancy.

Shop Fertility Advance → · Explore the research →