Once a couple decides to start trying to conceive, the natural next question is when to start everything else — including a daily fertility supplement. The honest answer is: earlier than most couples think, and earlier for him than for her. This guide walks through how many months of lead time actually make sense, what each partner should start with, and when the answer is “see a doctor,” not “wait a few more months.”
Why timing matters: two different biological clocks
Egg quality and sperm quality respond to daily habits and nutrition support on different schedules. Sperm regenerates roughly every 72–90 days, so a formula like AGO Dad or AGO Hàu Biển needs close to three months of consistent use before a semen analysis reflects sperm made during that window. For her, egg maturation runs on a roughly monthly cycle, so AGO Mom is usually reviewed over about three cycles rather than three months — similar length, different clock.
That gap is the whole reason for this article: if a couple only starts supplements the week they begin trying, his side of the routine has had almost no time to matter by month one, while hers has had one full cycle.
How many months before TTC should you start?
| Situation | Suggested lead time | Why |
|---|---|---|
| No known fertility concerns, just want a head start | 1–2 months | Covers one full cycle for her and gets his routine underway before it matters most |
| Want a fair review window for both partners | 2–3 months | Matches the 72–90-day sperm cycle and about three of her cycles |
| 35+, or a known factor (PCOS, low sperm count, fibroids) | 3+ months, alongside a doctor | Longer runway plus a workup — see fertility supplements after 35 |
| Already trying, haven’t started supplements yet | Start today | There is no wrong month to start — today just becomes month one |
None of these numbers are a guarantee of how long conception itself will take — they describe how long a supplement routine needs to run before it is fair to judge it, not how long trying to conceive will take.
What each partner should start with
Her: AGO Mom is the base TTC formula our care team suggests women start with, alongside a prenatal if one isn’t already part of the routine — see AGO Mom vs prenatal vitamins for how the two fit together rather than duplicate each other.
Him: AGO Dad covers the broader male-fertility routine; men whose main focus is sperm count, motility or general vitality often add AGO Hàu Biển, the zinc-rich oyster-extract formula, alongside it — see AGO Dad vs AGO Hàu Biển for which to start with.
Many couples simply start both routines the same week and let his run a little longer before judging it, since his clock runs slower. See his and hers fertility supplements: a 90-day plan for a week-by-week layout.
What to expect during the lead-time window
| Month | Her | Him |
|---|---|---|
| Month 1 | First full cycle on AGO Mom; settling into a daily habit | Early weeks on AGO Dad / AGO Hàu Biển; still well before day 72 |
| Month 2 | Second cycle logged; a good point to also review diet, sleep and stress | Roughly halfway through one sperm cycle |
| Month 3 | Third cycle — a fair review point for her routine | Close to the 72–90-day mark — a fair review point for a semen analysis if one is planned |
If either partner wants an objective marker rather than a felt sense of “is this working,” a baseline semen analysis before starting and a repeat one around day 90 is the clearest way to see whether anything changed.
When not to wait on supplements
Lead time is a nice-to-have, not a requirement, and it should never delay medical care. Talk to a fertility doctor now, rather than waiting out a supplement lead time, if either of you is 35 or older, if a semen analysis has already come back abnormal, if you have a diagnosed condition such as PCOS, fibroids or blocked fallopian tubes, or if you have already been trying for 6–12 months without success. Supplements are designed to support wellness alongside that care, not in place of it — see our preconception checklist for when to escalate.
If none of those apply, there is no wrong month to start. The couples who get the clearest sense of whether AGO is working for them are simply the ones who started consistently and gave each formula its full review window — about three cycles for her, about 72–90 days for him.