What I Wish I'd Known Before We Started Trying for a Baby

After 18 months of research, conversations with three different doctors, and a bathroom cabinet full of bottles I now know weren't doing what I thought they were.

The first fertility supplement I ever bought was the one with the prettiest label.

I picked it up at the pharmacy on the way home from a friend's baby shower. We hadn't told anyone we were trying yet, and I remember feeling weirdly emotional about the whole thing, that quiet, private kind of hope you don't say out loud. I read the back of the bottle for about four seconds. Folic acid, iron, B vitamins, the usual list. It looked like every other bottle on the shelf. I assumed they were all basically the same.

That was a year and a half ago.

In the time since, I have read more peer-reviewed research than I ever thought I'd voluntarily put my eyes on. I have sat across from three different doctors, two of whom told me everything looked "fine" without elaborating much further, and one who finally explained why "fine" isn't the same as "optimised." I have ordered a genetic test I'd never heard of, learned a vitamin I thought was healthy might not be the form my body can actually use, and quietly worked through a slow re-education about what's really inside the bottles women like me get handed without much explanation.

I'm not pregnant yet. I'm telling you that up front because I'm tired of fertility content that pretends every story ends the same way.

What I can tell you is that my cycles are calmer, my energy is steadier, and I no longer feel like I'm flying blind through my own body. That's worth something, even before whatever happens next.

If you're in the early-to-middle of this kind of research yourself, here are the six things I wish someone had told me at the start. I'll link to the studies as I go.

01.The folate in most off-the-shelf supplements isn't the form your body actually uses

This is the one that genuinely shocked me when I learned it.

The vitamin labelled "folic acid" on most supplement bottles is a synthetic version. Your body has to convert it into the active form, methylfolate (5-MTHF), before it can be used for DNA synthesis and the cellular processes that matter when you're trying to conceive. The conversion happens through an enzyme called MTHFR.

Here's the thing research suggests: a meaningful portion of the population has a genetic variation that reduces how efficiently this conversion happens. In some women, the enzyme works at a fraction of normal capacity. The folic acid goes in. The methylfolate the body actually needs to use? Much less of it ever shows up.

This is one reason adequate folate stores in the months before conception matter so much. I did a genetic test through my GP and learned I carry one of the more common variants. I'd been taking folic acid for nearly a year, assuming it was doing its job.

What I look for now: fertility-support supplements that use methylfolate (sometimes labelled as L-5-MTHF, Quatrefolic, or Metafolin) instead of folic acid. The active form skips the conversion step entirely.

02.The B12 in most supplements has the same conversion problem

Once I understood the folic acid issue, I started reading every label with new eyes. The next thing I noticed: most multivitamins and fertility blends use a form of B12 called cyanocobalamin. Cheap, stable, shelf-life of forever.

It's also a synthetic form your body has to convert into the active version, methylcobalamin, before any of it does anything useful. The same conversion pathway issue that affects folate can affect B12 absorption in some women, particularly those who are over 30 or who carry MTHFR variants.

What I look for now: formulas using methylcobalamin or adenosylcobalamin, the active, body-ready forms. Slightly more expensive to formulate. Worth the difference.

03.Choline is missing or under-dosed in nearly every supplement I checked

Choline barely got mentioned in any of the supplement advice I was given. When I started looking into it, I realised most fertility and multivitamin supplements contain either zero choline or a token amount well below what research suggests women need in the months leading up to pregnancy.

Adequate choline intake from preconception onwards has been associated with healthy development in early pregnancy. The recommended intake during preconception and pregnancy is around 450 mg per day. Most of the supplements I checked contained 50 mg or less. Some had none at all.

I was getting most of my choline from eggs and not much else. After learning this, I started looking for a supplement that actually included a meaningful dose, rather than a sprinkle for the label.

04.The iron form determines whether you can actually tolerate it

I gave up on my second supplement because the iron made me nauseous every morning. I assumed iron just did that. Turns out the form of iron matters more than I realised.

Most cheap formulas use ferrous sulfate, which is poorly tolerated by a significant portion of women and frequently associated with stomach upset, constipation, and nausea. Better-tolerated forms include iron bisglycinate (a chelated form that's gentler on the gut) and other amino-acid-bound versions.

When I switched to a supplement using bisglycinate, the nausea stopped within a few days. Same nutrient. Different form. Completely different experience.

05.Cortisol and stress matter more than I'd been told

I want to be careful here, because fertility content has a habit of telling women to "just relax," which is unhelpful at best and gaslighting at worst. So I'll say this carefully and let the research speak.

Chronically elevated cortisol affects reproductive hormone signalling. Sleep, blood sugar regulation, and adaptogenic support aren't a replacement for medical care, but research suggests they're part of an underlying picture that often gets ignored when women are told everything looks "fine on paper."

What I started paying attention to: ingredients in my preconception stack that support adrenal and stress regulation alongside the standard nutrients. Things like ashwagandha, magnesium glycinate, and adequate B-complex levels. Not as a fertility cure, just as a quieter foundation for everything else.

One important caveat: ashwagandha and similar adaptogens are appropriate during the preconception phase but should not be continued in larger amounts during pregnancy. This is one of the reasons preconception support and pregnancy-stage support are typically different formulas. If and when pregnancy happens, talk to your healthcare provider about what to keep and what to swap out.

06.Vitamin D3, not D2

The vitamin D in older multivitamin formulas is often D2 (ergocalciferol), a form less efficiently used by the body than D3 (cholecalciferol). Research suggests D3 raises and maintains blood levels of vitamin D more reliably than D2, particularly over a months-long preconception window.

A lot of supplements still use D2. It's a small detail, but small details add up over months.

What I look for now: D3 in a meaningful dose (typically 1,000 to 2,000 IU, depending on baseline blood levels, check yours).

The fertility supplement I'm currently taking

I tried four different supplements over 18 months before I found one that ticked all the boxes I'd learned to care about. I'm not affiliated with any brand for the purposes of this article, but I'll tell you what I'm currently taking, because that's the question I'd want answered if I were reading this.

I take BAE Nutrition's Fertility Tonic. It's a preconception support formula, designed for the months you're trying to conceive.

Reading further, I learned the formula was put together by a mother who happens to be a board-certified physician. She built BAE because she'd been through this herself and noticed what most supplement brands miss: women don't need more products, they need the right support at the right stage. The brand makes separate formulas for fertility, pregnancy, and motherhood, which is part of why I felt comfortable starting with the Fertility Tonic specifically.

That mattered to me. Most of the supplements I'd tried before this were formulated by marketing teams chasing a category. This one started with a doctor.

Here's what made me try it, in plain terms:

• Methylfolate, not folic acid
• Methylcobalamin, not cyanocobalamin
• A meaningful choline dose (not a token amount)
• Iron bisglycinate, not ferrous sulfate
• D3, not D2
• Adaptogenic and adrenal-supporting ingredients designed for the preconception phase

I'm not telling you this is the only good option, or that switching supplements is a guarantee of anything. Research suggests these formulation choices may support reproductive health in the months before pregnancy more effectively than the older formulas I'd been using. Whether that makes a difference for you specifically depends on a lot of factors I can't see from where I'm sitting.

What I can say is that since switching, my cycles have been more regular, my energy more stable, and I've stopped feeling like I'm white-knuckling my way through every month. That alone has been worth the change.

A reminder: Fertility Tonic is a preconception formula. Once pregnancy happens, supplement needs change. Some preconception ingredients, including ashwagandha, aren't recommended in larger amounts during pregnancy. BAE makes a separate Everyday blend designed for that next stage, which acts as a true prenatal once pregnancy is confirmed. That's the formula I'll be transitioning to when the time comes (after running it past my doctor first).

See BAE Nutrition Fertility Tonic → Free shipping in the US.

I started this whole process feeling like I was supposed to know all of this already. Like everyone else had been handed a manual I'd somehow missed.

What I learned is that most women aren't told any of this. Not by their GPs, not by the bottles on the pharmacy shelf, not by the influencer accounts that mostly just show baby announcements without the part in the middle.

If you're somewhere in the part in the middle, quietly researching, switching brands, googling things you wish someone would just explain to you, I hope something in here was useful. The six things above are the ones I most wish I'd known earlier. The studies are linked throughout if you want to read them yourself.

Wherever your story is heading, I'm rooting for you.