Preconception Foundations

Most fertility clinics focus on one outcome: getting the patient pregnant. The functional medicine framework asks a different question: what is the biological environment a child will spend nine months developing in, and is it optimal? 

MTHFR mutations affect 40–60% of the population. If your patient has one and is taking folic acid, standard prenatal vitamins aren't just inadequate — they may be actively interfering with methylation. Elevated homocysteine is directly associated with miscarriage risk, and most fertility workups don't test for it.

This guide covers the three months before conception that have no equivalent window later in life, the methylation problem affecting a significant portion of your patient population, and the lab targets that matter for fertility — not population averages. Key markers included: ferritin, vitamin D, B12, homocysteine, hs-CRP, fasting insulin, TSH, and omega-3 index.

Spermatogenesis takes exactly 74 days. The sperm in an ejaculate today reflect health, lifestyle, and environmental exposures from the past three months — including DNA integrity, mitochondrial function, and epigenetic information that affects embryo development and fetal programming.

Standard semen analysis checks count and motility. It doesn't evaluate the variables that determine whether a pregnancy is maintained or whether the child is healthy.

This guide covers the biology behind the 74-day window, four lifestyle factors with direct and measurable effects on sperm quality, the nutritional framework, and a foundation supplement protocol — with the clinical rationale behind each recommendation.

A clinical review article by Dr. Lundell covering the developmental origins of health and disease (DOHaD).

The nutritional status, inflammatory burden, toxic load, and hormonal environment of both parents during preconception directly influence genetic expression in their offspring through epigenetic modifications. Those changes can persist for generations.

This article reviews the mechanisms of fetal programming, the critical windows in organogenesis, and the most significant modifiable risk factors — including methylation status, iron, maternal inflammation, microbiome, and endocrine disruptors — with clinical implications for preconception assessment and intervention.