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What’s The Best Soy Protein Powder?
Reviews & Buyer’s Guide

Best Soy Protein Powders Cover Image
Isaac Robertson
Written by Isaac Robertson

There is no denying the importance of protein in your diet.

Every cell in the human body relies on this essential macro-nutrient, and your hair and nails are made almost entirely from it.

Not only is protein necessary for building and repairing tissue, it is needed for your body to be able to manufacture enzymes, hormones, and the chemicals that it needs to be healthy.

Protein is both essential for your body's basic functioning and enormously beneficial for good health.

Eating a diet high in protein ensures that your body receives many health benefits including a faster recovery after exercise, a quicker build up of lean muscle, less hunger throughout the day, and an easier ability to maintain a healthy weight.

But, how much is too much? Are some forms of protein better than others? In this article, we will seek the answers you are most curious about.

Our Top 5 Soy Protein Powders (2019 updated)

There are dozens of soy protein powders on the market, but only a few stand out from the rest in regards to quality, good taste, and nutrition.

Below are our top soy-based protein products on the market and some crucial information about them.




BulkSupplement Editor Choice

#1 Bulksupplements

(Editor's Choice)

  • ​27g Protein
  • ​<1g Fat
  • ​0g Carbs
  • ​112 calories per serving
  • Promotes lean muscle growth​
  • ​​Strengthens & recovers muscle
  • ​Improves bone health
  • ​Tastes great & mixes well in water
  • ​Budget-friendly
150x150 Six Star Pro Nutrition Elite Series Soy Protein Powder

#2 ​Six Star Pro Nutrition

  • ​20g Protein
  • ​0.5g Fat
  • ​19g Carbs
  • ​160 calories per serving
  • ​Builds lean muscle mass
  • ​Supports muscle recovery
  • Can be easily mixed in any liquid
150x150-Bobs Red Mill

#3 Bob's Red Mill

  • ​17g Protein
  • ​1g Fat
  • ​0g Carbs
  • ​​80 Calories per 1/4-cup serving
  • ​Made only from 1 ingredient: isolated soy protein
  • ​Promotes muscle growth
  • ​Versatile; can be mixed with food
150x150-MHP Probolic-SR

#4 MHP Probolic-SR

  • ​​20g Protein
  • ​4g Fat
  • ​5g Carbs
  • ​​​140 Calories per ​1-scoop serving
  • ​7x more anabolic than whey
  • 12-hour Microfeed Technology
  • ​Packed with BCAAs, Aginine & Glutamine
150x150-Universal Nutrition

#5 ​Advanced SoyPro

  • ​​27g Protein
  • ​1g Fat
  • ​0g Carbs
  • ​117 Calories per 1-scoop serving
  • ​Water-washed soy protein isolate
  • ​Contains essential amino acids
  • ​Boosts immune system & bone health

1. Bulksupplements ​(Editor's Choice)

Bulksupplements Pure Soy Protein Isolate Powder contains 27g of protein in each 30g serving and is derived from soybeans.

The only ingredient is soy protein isolate - check the ingredients list if you don't believe us - which makes it 90% protein by weight.

This protein is ideal for anyone looking for something simple, pure, and "clean".

Additionally, Bulksupplements Pure Soy Protein is not flavored and with packaging being slim, it makes this one of the most affordable soy protein options out there.

BulkSupplement Editor Choice


  • ​Sourced from soy beans which are naturally rich in protein to build and strengthen muscles
  • Helps increase lean body mass while shredding fat at the same time
  • Helps develop stronger bones: it has 25% of the daily recommended value
  • ​Best taken within 30-minutes after workouts to speed up muscle recovery


  • ​Needs to be thoroughly mixed well with any liquid

With only 112 calories and less than 1g of fat per scoop, this vegan and vegetarian soy protein powder is designed to help maximize lean mass building while avoiding fat gains.

​2. ​​Six Star Pro Nutrition

Six Star Pro Nutrition Elite Series

Six Star Pro Nutrition Elite Series not only has 100% soy protein, it also has all nine essential amino acids, which means that it has what you need to help stimulate muscle building and muscle recovery after those high-intensity workouts.

And yes, this protein powder is made for high-intensity workouts.

How can we tell?

Because Six Star Pro Nutrition Elite Series Soy Protein Powder contains added B6 and B12 vitamins.


  • ​Contains 100% soy protein
  • ​Has added B6 and B12 vitamins
  • ​Lactose, cholesterol and transfat-free
  • ​Contains 4g of fiber in every serving


  • ​Can be too sweet for other people
  • ​Made in a factory that also processes peanuts

As endurance athletes, these ingredients helped keep our blood sugar within a normal range and protected us against anemia during our oftentimes insane workout sessions -- something that other protein powders are not able to do.

​3. Bob's Red Mill

Bob's Red Mill Soy Protein Powder prides itself on being a natural alternative to traditional protein supplements.

This supplement is a nourishing source of protein that is dairy-free, gluten free, unflavored, and unsweetened.

This means that you don't have to worry about consuming any artificial chemicals in your protein shake when you choose to add a scoop of Bob's Red Mill Protein Powder.

Bob's red mill soy protein powder


  • ​Only made from one ingredient: isolated soy protein
  • ​Builds and develops lean muscle growth
  • ​Great-tasting & can be mixed with shakes, ​hot cereal, or even pancakes!


  • ​It gave us a gritty texture when mixed ​in a smoothie
  • There are other brands that has higher protein content​

As an added benefit, every product from the company is certified Kosher and is millstone ground at slow speeds, ensuring that the nutrients and flavor of the grains is preserved, which means that you can know you are buying a high quality product.

​4. MHP Probolic-SR

Probolic SR, soy protein mix powder

Produced by Maximum Human Performance (MHP), Probolic-SR is a soy protein mix that is formulated to help release protein into your body slowly over time.

This keep you full longer while your body benefits from the precise muscle building proteins that will help push your workouts. 

It will also fill you with far greater anabolic and anti-catabolic benefits than other protein supplements.


  • ​7 times more anabolic than whey based on a study
  • Helps provide a combination of fast, medium, slow release, & 12-hour microfeed technology to build better muscles
  • ​Has high levels of Arginine, BCAA's, & Glutamine


  • ​We find it hard to blend it with other liquid
  • ​Its vanilla flavor variant doesn't taste that good

If your goal is to build muscle and keep yourself fueled longer, then Probolic-SR is a smart supplement to take.

​5. ​Advanced SoyPro

Created by Universal Nutrition, Advanced Soy Protein is an optimum protein supplement that can be used whether or not you are a serious athlete.

This supplement has the essential amino acids that your body needs to convert protein into muscle.

The 100% water-washed process also ensures that you get the optimal benefits without any harmful additives.

Universal Nutrition Advanced Soy Protein


  • ​Made from 100% water-washed soy protein isolates
  • Has essential amino acids that the body needs in building muscles
  • Helps boost immune system, improves bone health, & lowers cholesterol


  • ​Hard to mix with water or milk
  • ​Texture is a bit chalky

By not exposing the product to the ethanol wash that is common with other soy protein supplements, your body gets the high levels of isoflavones that are found in soy beans naturally and consequently the maximum benefits from soy.

What Is Soy Protein?

Like other common forms of supplemental protein, soy protein has many positives and possible negatives for your health. The Soyfoods Association of America has defined soy protein isolates as the following:

Soy protein isolate can be found in a wide variety of health foods, ranging from protein bars, meal replacement shakes, bottled fruit drinks, meat substitutes and baked goods.

Soy protein isolate is a dry powder food ingredient that has been separated or isolated from the other components of the soybean, making it 90 to 95 percent protein and nearly carbohydrate and fat-free.

Soyfoods Association of America

You should know that soy is an ingredient in your food if you see one of the following terms on the nutrition label: mono-diglyceride, soya, soja, yuba, TSF (textured soy flour), TSP (textured soy protein), TVP (textured vegetable protein), or MSG (monosodium glutamate).

Though not all textured vegetable protein comes from soy, a good amount of it does, while lecithin can be made from soy, eggs, or corn. To know for sure what is in your food, you can contact the manufacturer for a more detailed ingredients list. [1]

The 2 Different Types

There are two main ways that soy protein is manufactured and sold:

  • Concentrate
  • Isolate

1. Soy protein concentrate - formed when the fat content is taken out of soy beans, leaving a white flaky substance in its place.

After these flakes are given an ethanol extract to neutralize its pH levels, the substance is solid enough to be sold or used within prepared foods.

Because of the ethanol extraction, soy protein concentrate has a low level of isoflavine, (plant-derived estrogen) usually around 4% of the initial amount within the bean. [​2]

Soy beans

This makes soy protein concentrate a smart protein supplement for men that are worried about the side effects of consuming estrogen enhancers.

2. Soy Protein Isolate - After the formation of white flakes in soy, the concentrate is processed one more step through centrifugation that extracts the highest percentage of protein by weight.

The isoflavone levels remain higher (35-45%) than in soy protein concentrate because the step of ethanol extraction is skipped. Men that are concerned about estrogen should avoid taking large amount of soy protein isolate.

​With soy protein isolate containing as much as 90 percent crude protein, one might be excused to think that, given that the economics are right, a more concentrate source can be used as effectively as soy protein concentrate."

​Ioannis Mavromichalis, Ph.D.

Is Soy Protein Bad for You?

In recent years, these products have been getting a bad reputation. Many people believe that the majority of health claims for soy are actually false and the result of clever marketing schemes from food companies. 

Some of their worst claims to the contrary are as follows:

  • 90 to 95% of US-grown soybeans are genetically modified - This means that any soy product you buy is likely to be genetically engineered, and GMO foods have been occasionally found to pose health risks like hormone disruption and fertility problems.
  • Lower sex drive - In some cases, eating excessive amounts of soy-based products can negatively effect your sex life. If you are a male and eat more than 25 grams of soy protein daily, the isoflavones that are present in soy products can reduce your testosterone levels, causing you to suffer from decreased libido or even erectile dysfunction.
  • Estrogen levels can get messed up - Isoflavones from soy can activate your body's estrogen receptors and make your body act as if estrogen is present. Because the structure of isoflavones is similar to estrogen, they can decrease you body's natural levels of estrogen, and mess with the menstrual cycle enough to reduce fertility in females.

You might be ready to swear off soy-based products for good after reading some of the purported negative health effects, but in truth the vast majority of soy products are not dangerous and are actually nutritionally beneficial instead.

​You might be ready to swear off soy-based products for good after reading some of the purported negative health effects, but in truth the vast majority of soy products are not dangerous and are actually nutritionally beneficial instead.

Overall, soybeans have an impressive nutritional record. Each bean contains 30% carbohydrates (half of which are from fiber), 18% oil, 14% moisture, and a whopping 38% protein.

Research into the benefits of soy protein have shown that they can help lower your LDL cholesterol levels by as much as 5%. [​3]

While that might not seem like much, small differences in your cholesterol level can have a big impact on your overall health.

Organic market drawing

Simply choosing to consume organic soy-based products reduces your risk of being exposed to estrogen-damaging herbicides.

Likewise, here is a simple way to get rid of the negative hormone effects of soy and instead make it a safe and healthy food source: fermenting it.

The process of fermenting soy destroys the dangerous compounds it contains and makes it both safe and beneficial to eat.

Historically, Asian populations have eaten large amounts of fermented soy while being some of the healthiest and longest living people in the world.

Other evidence has shown that eating fermented soy can prevent osteoporosis, reduce your risk of various cancers, and prevent you from developing dementia.

  • Osteoporosis
  • Reduce your risk o​​​​f various cancers
  • Prevent you from developing dementia

Therefore, there is little to no risk for men and women to eat moderate amounts of soy protein isolate as part of a healthy, balanced diet.

In this way, soy protein can be viewed as a one more nutritional tool to help you meet your daily protein needs.

Soy vs Whey Protein

Soy vs whey sign

Because whey and soy have key differences in regards to content and nutritional value, it's important to understand these differences so that you can make the right choice for you.

Whey protein is useful for maintaining bone health, putting on body mass (, and repairing muscles after an intense strength workout, which makes it a smart choice for a post-workout snack.

Though whey protein provides you with a good balance of amino acids and minerals, it comes from dairy, anyone that is lactose intolerant will struggle to be able to digest it. Other negative side effects can include gas and bloating, cramps, headaches, and general fatigue and exhaustion.

You can read more about Whey here:

Soy protein is a great alternative protein source for anyone who is lactose intolerant or trying to cut down on their animal-based products. Though whey has long been considered the ideal protein for body building, the truth is that the key benefits of soy are almost equivalent.

Soy protein has been eaten by humans for over 5,000 years and is considered to be one of the highest quality plant-based proteins that nature provides. Each bean contains all the amino acids necessary for complete health.

The “feminizing” reputation of soy protein is largely unfounded, especially if you take the time to make sure your soy is sourced from high quality, organic sources.

The honest truth is that there is no right or wrong answer here. It's all about personal preference. 

For best body building results, whey and soy protein should be used together.

​In this case, whey and soy protein supplements will keep you in peak physical condition.

woman drining whey

​Whey protein contains a large amount of branched chain amino acids, while soy protein has high levels of the amino acids arginine (a hormone that stimulates muscle formation) and glutamine (essential for workout recovery).

​The Best Soy Protein Powder Is?

When organically sourced and eaten in moderation, Bulksupplements is a smart choice if anyone is aspiring to add extra protein to their diet.

Choosing the right supplement for your dietary needs can be tricky. However, Bulksupplements Soy Protein Powder is an ideal choice for anyone that struggles to digest lactose and/or wants to avoid consuming animal products.

Now, we want to hear from you. What has your experience with soy protein been like? Are there any soy protein supplements that you would recommend?

Be sure to let us know in the comments and we'll try to feature your suggestions in a later article.

Our #1 Soy Protein Powder

  • ​27g of high-quality soy protein isolate
  • ​Less than 1g of fat and only 112 calories
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    Promotes lean muscle buildup & recovery
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    ​Improves overall bone health
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    Affordable & great-tasting
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    ​Lactose-free ​& vegan-friendly

About the author

Isaac Robertson

Isaac Robertson

I’m a personal fitness trainer and nutritionist living in sunny Indianapolis, IN. I’ve spent the last 8 years staying at the forefront of the health and fitness industry. In that time, I’ve helped hundreds of people shed the excess weight and get into shape, maintaining their healthy new lifestyle through proper training and eating habits. You can read more about me here​.

  • I don’t know what’s better between soy protein vs whey and this article explained its differences in a clear manner. Because I’m lactose intolerant, I have to go with soy. Will definitely buy the recommended product here. Cheers mate!

  • Thanks for this good product review, I learned a lot. You covered the topic and the 5 recommended products well so I feel good about making a decision.

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