If you’re breastfeeding and your milk supply feels low, Google will hand you a long list of supplements that promise to fix it.
Fenugreek. Moringa. Shatavari. Blessed thistle. Goat’s rue. Spirulina. Oats in every form imaginable.
Some of these have real evidence. Some have tradition and nothing else. A few have evidence that’s been misread, overstated, or attributed to the wrong ingredient entirely.
We spent months researching this for our own lactation supplement formula. Here’s what the evidence actually says — and where most supplements get it wrong.
The uncomfortable truth about lactation supplements
Most lactation supplements are not backed by strong clinical evidence.
The Cochrane Review (the gold standard for evidence-based medicine) looked at the best available data on herbal galactagogues and concluded: “very low certainty evidence” of benefit for most common ingredients.
That doesn’t mean they don’t work. It means the studies that exist are small, poorly designed, or measure the wrong things. And it means you should be sceptical of any brand claiming their product is “clinically proven” without being able to name the actual trial.
What we found, ingredient by ingredient
Fenugreek — the most famous, but complicated
Fenugreek is in almost every lactation supplement. It’s been used for centuries. And it’s… complicated.
The best-known study (Turkyılmaz et al., 2011) showed more than a doubling of milk volume. But that study didn’t test fenugreek alone — it tested a multi-ingredient herbal tea called “Still Tea” that combined fenugreek with hibiscus, fennel, rooibos, raspberry leaf, verbena, goat’s rue, and vitamin C.
When fenugreek has been tested by itself, the results are mixed. One RCT found no significant effect at all. A 2018 meta-analysis found a modest 11.1 mL weighted mean difference — but was formally rebutted in 2021 by Grzeskowiak for data extraction errors that made the conclusions unreliable.
LactMed (the NIH’s breastfeeding database) puts it plainly: the effect “may be primarily psychological in humans.”
We included fenugreek in our formula at 2,400mg per day (split across two serves) because it’s safe, inexpensive, and still the most-used galactagogue in the world. But we don’t pretend the evidence is definitive.
Moringa — the most promising
If there’s one ingredient with genuine momentum, it’s moringa. Eight RCTs exist as of 2025.
The results are mixed overall. The primary capsule-dose study at 900mg (Fungtammasan & Phupong, 2022) was conducted in term postpartum mothers and found a 47% increase that did not reach statistical significance (p=0.19). Meta-analyses of preterm mother studies found significant increases at days 2–3 postpartum. Serum prolactin increases are documented across studies, though the correlation between prolactin levels and milk volume is inconsistent.
Moringa works differently to fenugreek. It’s not just acting on hormones — it’s genuinely nutritious. Leaf powder is rich in iron, calcium, amino compounds, and flavonoids. Maternal energy reserves matter for milk production, and moringa addresses that directly.
We settled on 900mg per day — at the upper end of the capsule-based study range (most RCTs used 250–800mg). Importantly, this is leaf powder only. Moringa root, bark, and seed are contraindicated due to uterine-stimulant properties.
Shatavari — the Ayurvedic classic
Shatavari (Asparagus racemosus) has been used in Ayurvedic medicine for centuries to support lactation. Small Indian trials show increased milk volume and prolactin levels. A 2025 RCT used 300mg of standardised extract and found positive results.
The earlier landmark study (Gupta & Shaw, 2011) used approximately 3,600mg per day of raw root (60mg/kg/day for a 60kg woman) and showed roughly a 3× increase in prolactin relative to placebo. Our standardised extract dose of 1,000mg per day is lower but comparable to the 300mg standardised extract used in the 2025 RCT.
The evidence base is thin — small trials, methodological limitations — but what exists points in a positive direction, and safety during breastfeeding is well established.
Brewer’s yeast — tradition, not trials
Brewer’s yeast has been a lactation staple for decades. But until very recently, there were no human trials.
That changed in 2025 when Jia et al. published the first RCT of brewer’s yeast for lactation (5g per day for 4 weeks). They found no objective milk supply benefit — though more mothers self-reported increased supply.
We included it because it’s a traditional ingredient, rich in B-vitamins and nutrients, and safe. But we position it honestly: it’s nutritional support, not a proven galactagogue.
The ones we left out
Goat’s Rue — popular in US supplements, but not listed in the TGA Permissible Ingredients Determination. It can’t legally be included in an AUST L-listed medicine in Australia. It also has significant hypoglycaemia risk and is contraindicated in diabetes.
Blessed Thistle — in almost every Western lactation blend. Zero human trials. LactMed confirms no scientifically valid evidence supports its use.
Fennel — some positive studies, but estragole (a compound in fennel) has been flagged as genotoxic by EFSA. The EMA explicitly advises against fennel use by pregnant and lactating women, and children under four.
Alfalfa — contraindicated in people with autoimmune conditions (L-canavanine can trigger flares in systemic lupus), and interferes with warfarin due to vitamin K. Not worth the liability.
The bioavailability question
Here’s something that surprised us: even if you pick the right ingredients, they might not absorb well.
We added piperine (black pepper extract) at 10mg per day as a bioenhancer. It works through a well-understood mechanism — inhibiting CYP3A4 and P-glycoprotein enzymes that break down active compounds before they’re absorbed. The evidence on how significant this effect is varies: the famous 2,000% curcumin increase was never replicated in independent studies, but mechanistic data consistently supports enzyme inhibition at a more modest level (30–100% increased AUC for most compounds).
At 10mg per day, piperine is within the range of typical dietary intake from black pepper in food (averaging 8–36mg per day depending on cuisine). Safe at this dose, though anyone on CYP3A4-metabolised medications should review with their doctor first.
What our plan is from here
After the research, we settled on a focused 7-ingredient formula:
| Ingredient | Dose per day (2× serve) | Role |
|---|---|---|
| Fenugreek seed | 2,400mg | Direct lactation support |
| Shatavari root extract | 1,000mg | Direct lactation support |
| Moringa leaf powder | 900mg | Nutritional + mild prolactin support |
| Brewer’s yeast | 1,000mg | Traditional ingredient, B-vitamins |
| Mecobalamin (active B12) | 200mcg | Maternal nutritional support |
| 5-MTHF (active folate) | 800mcg | Maternal nutritional support |
| Piperine (BioPerine®) | 10mg | Bioavailability enhancer |
Four size 00 vegetarian capsules per day — two in the morning, two in the evening with meals.
Not a mega-formula. Not a 12-ingredient polyherbal blend. Every ingredient has a specific reason to be there and has been checked against TGA AUST L requirements.
The honest answer to “will this work?”
Some mums will notice a difference within days. Others won’t. Lactation is complex — hydration, nutrition, stress, sleep, feeding frequency, baby’s latch, thyroid function, birth mode — and no capsule fixes all of that.
Important: our formula is currently in the research and development phase. All ingredients have been verified against TGA guidelines, but the product is not yet manufactured or available for sale.
What we can promise: our formula is based on the best available evidence, honest about what’s known and unknown, and formulated for safety during breastfeeding.
That’s more than most brands can say.
This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting any supplement during breastfeeding.