Protein Powder for PCOS/PMOS: How to Choose

The best protein powder for PCOS or PMOS is made from pea, egg white, collagen, hemp or beef protein isolate, or a combination of these. Leave out whey, and choose one with less than 6 grams of carbohydrate per serve, no added sugar, and a natural sweetener like stevia or monk fruit.

Use it to get 30 to 40 grams of protein into your breakfast. What you eat for breakfast is the most impactful habit you can change for your PCOS, and a good protein powder is one of the easiest ways to hit that target.

I encourage you to go for whole food sources of protein where you can, like eggs, salmon or last night's leftovers. But as a busy mum myself, I know how difficult finding time to make a large breakfast can be, and that is what a protein powder is for.

PCOS is also called PMOS. Our PCOS-to-PMOS explainer covers the newer term and what it means.

What the research actually answers

Protein at breakfast keeps your blood sugar steady, so your body doesn't need to release as much insulin. That matters in PCOS, because high insulin triggers your ovaries to make more testosterone, worsening your symptoms and making it harder to lose weight. Insulin resistance affects at least 80 percent of women with PCOS, and a high-protein breakfast helps balance your hormones whichever root cause you have.

When eight trials of higher-protein diets in women with PCOS were pooled, fasting insulin was lower on the higher-protein diets (Wang et al. 2024). The 2023 international guideline doesn't favour one diet composition over another, and recommends healthy eating that suits your own preferences and goals (Teede et al. 2023). After years of trialling diet changes with my clients and myself, breakfast is the one I have found makes the biggest difference.

Start with the job

Start with breakfast. Protein powder is one of the easiest ways to get the 30 to 40 grams of protein your first meal needs, and you can use it three ways:

• As a smoothie that is your whole breakfast.
• As a drink on the side, to top up eggs or leftovers to your target.
• As a snack between meals, in a smoothie or in homemade protein balls made with nut butter, protein powder and almond meal.

A protein shake is good for PCOS, and makes a good meal replacement at breakfast, when you build it as a meal: blend a scoop of vanilla or chocolate protein powder with frozen zucchini or cauliflower, almond or coconut milk, and some healthy fat like nut butter or avocado. Lunch and dinner are real meals on my PCOS Plate Method: around a quarter of the plate protein, a quarter gentle carbs, half non-starchy vegetables and a serve of healthy fat. Those gentle carbs support your energy and ovulation, so they belong in your later meals.

For PCOS weight loss, the best protein powder is the same one, used the same way. A high-protein, low-carbohydrate breakfast is one of the fastest ways to improve insulin resistance: it steadies your blood sugar and reduces cravings later in the day. Make breakfast your bigger meal and dinner the lighter one, and don't skip breakfast, because skipping it is one of the worst things you can do for your hormones, blood sugar and insulin.

Find the gap before choosing a scoop

Aim for 30 to 40 grams of protein at breakfast, and let the powder make up whatever your food doesn't. One egg has around seven grams of protein, so eggs alone would take four or five. Three eggs give you 21 grams, and a smoothie with a scoop of protein powder on the side closes the gap.

If that is more than you are used to, start with around 20 grams and slowly work your way up. After a few weeks of eating this way, your hunger, fullness and taste buds adapt.

This is a breakfast target, so you won't need this much protein at your other meals. Stick with it for at least two to three weeks before you add another change; it will have a powerful impact on your PCOS within weeks. You won't need this much at breakfast forever either, just while your insulin and other hormones find their balance again, which usually takes around three months.

Eat it within an hour of waking. It should keep you full for at least three to four hours, and sometimes six or seven. If you are hungry after two, add some extra healthy fat: coconut milk in your smoothie, nut butter or avocado.

If you have kidney disease or have been told to limit protein, check this target with your doctor before you raise your protein (National Institute of Diabetes and Digestive and Kidney Diseases).

Compare protein output, not scoop size

Read the protein per serve on the nutrition facts label, not the size of the scoop, and count it towards your 30 to 40 grams. For price, note four numbers: serving size in grams, protein per serve, serves per container, and price. A large scoop can give a large protein number while giving you fewer serves in the tub.

For a fair price comparison, standardise the protein rather than the scoop:

Cost per 20 g of protein = price ÷ total grams of protein in the container × 20

If a $45 tub contains 18 servings with 24 g of protein each, it contains 432 g of protein. Its cost per 20 g of protein is about $2.08.

Then choose a flavour you know you will enjoy, so that you will actually use it.

Choose the source by your constraints

Any base on my list works for PCOS: pea, egg white, collagen, hemp or beef protein isolate, on its own or in a blend. Within that list, let your own constraints decide: whether you eat plant-based, how a powder sits with your digestion, taste and cost.

Pea protein is a good choice for PCOS. It is first on my list, and it is the main protein in the powder I designed for Cysters.

Collagen is the easiest top-up. Instead of a fourth and fifth egg, stir a scoop of collagen powder into your spearmint tea.

Is whey protein good or bad for PCOS?

Whey is the protein powder to avoid for PCOS, because dairy products tend to stimulate insulin production.

Dairy contains insulin-like growth factor 1 (IGF-1) and branched-chain amino acids (BCAAs), which are there to grow a calf into a cow, and in us they cause a spike in insulin. More insulin tells your ovaries to make more testosterone, which increases oil production in your skin, blocking pores and causing acne.

How strict to be with the rest of your dairy depends on your root cause. If you have Insulin-Resistant PCOS, avoid all dairy except butter and ghee while you heal your insulin levels, and if acne is one of your main symptoms, follow the same rule whatever your type. With Adrenal, Post-Pill or Inflammatory PCOS, sheep and goat milk products are usually fine. Whichever type you have, swap whey protein for pea, collagen, brown rice or egg white protein to support healthy insulin levels and clear skin. If you don't know your type yet, my root cause quiz tells you.

Judge the product as you will actually use it

Check the nutrition facts label: a PCOS-friendly protein powder has less than 6 grams of carbohydrate per serve and no added sugar.

Look for natural sweeteners like stevia or monk fruit, and avoid artificial sweeteners like aspartame and sucralose.

Then judge it as the smoothie you will drink. For years my “super healthy” breakfast was a smoothie made with frozen banana, oats and yoghurt, and within an hour or two I was starving. When I switched to the PCOS Repair Breakfast, I was satisfied until lunchtime and had no sugar cravings for the rest of the day. So keep the fruit in your smoothie to the low-sugar kinds, such as half a cup of blueberries, a cup of raspberries or eight strawberries, and leave out honey and maple syrup.

Make quality claims show their work

Choose a brand that has its powder third-party tested for heavy metals and other contaminants and made in a GMP-certified facility, and says so on its page. In the United States, the FDA does not approve dietary supplements for safety, effectiveness or labelling before they are sold (FDA 101: Dietary Supplements), so that testing is what tells you what is in the tub.

After hundreds of messages from readers asking which protein powders I recommend for PCOS, I wasn't happy with anything on the market, so I decided to design my own.

Every powder I tried was built for athletes or weight loss, most contained soy, and they all left me bloated. So FloFit Protein is organic pea protein with pumpkin seed and chia seed protein: 20 grams of complete plant protein a scoop, dairy-free, soy-free and sugar-free, with no artificial sweeteners, and a digestive enzyme blend so it is easy to digest without the bloat. It has added PCOS-supportive nutrients to support healthy weight loss goals and balance your blood sugar.

It is third-party tested for heavy metals and microbes and made in a GMP-certified facility in the USA. Mix one scoop with at least 300 mL of water, almond milk or coconut water once a day, or blend it into your breakfast smoothie. I take it every day.

I wrote my book, The PCOS Repair Protocol, to put the whole plan in your hands, including the breakfast principles in full and the dairy rules for each root cause. Start with tomorrow's breakfast: plan your breakfasts for the next week around 30 to 40 grams of protein, and stock up on what you need.