Sperm DNA integrity, testosterone, and the male-factor variables your clinic isn’t asking about.
If your semen analysis came back “normal,” that may not be the whole picture
Roughly 30 to 40 percent of unexplained IVF cycle failures involve elevated sperm DNA fragmentation. Most of these men have normal standard semen analysis — count, motility, and morphology all pass — and the actual factor driving the failed cycle sits unmeasured. The questions that would catch it are almost never asked.
What sperm DNA fragmentation is — and why it matters
The standard semen analysis evaluates whether sperm exist, swim, and look right. It doesn’t evaluate whether the DNA inside the sperm is intact. Fragmented sperm DNA can fertilize an egg and produce an embryo that fails to develop, fails to implant, or miscarries. This is one of the most consistent silent factors in unexplained cycle failure. The test for it — the DNA Fragmentation Index, or DFI — can be ordered through your urologist or some fertility clinics.
This is exactly the test you should ask about if you’ve had a failed cycle, an unexplained infertility diagnosis, or recurrent early miscarriage with otherwise normal workup.
What actually moves the male-factor numbers
The strongest evidence is, in rough priority order:
- Sleep — specifically, deep sleep architecture. Testosterone production is time-locked to deep sleep cycles between roughly 2 and 4 a.m. Cutting that window doesn’t shift testosterone — it suppresses it. No supplement replaces what wasn’t made because he was up.
- Cannabis cessation. One of the most consistently documented factors in elevated DNA fragmentation in the literature, often used to manage the very stress of fertility treatment. The trade is rarely worth it.
- Heat exposure. Laptops on the lap for hours, hot tubs, saunas, heated car seats, long-distance cycling. These compromise testicular thermoregulation and elevate DNA fragmentation. Phone in the front pocket is a smaller but documented exposure.
- Emotional suppression. The male version of loneliness isn’t fewer social events — it’s having people around and not telling them what you’re going through. Chronic suppression shows up in sleep, then testosterone, then sperm.
- Targeted supplementation based on labs. CoQ10 for sperm DNA integrity has meaningful evidence. Most “fertility stacks” don’t.
For her: please show him this page
Most men in the IVF process are coping by being “the steady one” for their partner while suppressing their own grief, fear, and shame. That suppression is its own cortisol load. The strongest thing he can do for her cycle is stop suppressing for her — and address the variables above directly.
What we work on together
The 12-week pre-IVF protocol is for both partners. Sperm development takes ~74 days; the inputs you change today are reflected in the sperm produced for retrieval. We address the variables that are routinely missed — sleep architecture, DNA fragmentation risk factors, emotional load — in parallel with female-factor work.
What this is not
This is coaching, not medical care. If you have male-factor concerns, you should be evaluated by a urologist or men’s health specialist. We work on the inputs your clinic isn’t asking about. See full disclaimer.
Next step
Book a free 30-minute Pre-IVF Couple Audit. Both partners welcome. We’ll talk specifically about the male-factor variables your clinic may have missed.