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15 Best Soy Protein Powders | OriGym

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Are you wondering ‘what is the best soy protein powder in the UK?’. If so, you’re in the right place! 

Here at OriGym, we’ve got you covered with our list of the 15 very best soy protein powders that you can buy today.

If you follow a plant based diet, drinking soy protein regularly is a great way of ensuring that you hit your protein goal with ease.  

Before we go any further if you’re interested in a career in the health and fitness sector, why not check out OriGym’s Advanced Sports Nutrition Course.

Otherwise, you can download our prospectus for further information about the range of courses that you can study with us! 

Feel free to also download our FREE 16 Week Strength Training Programme before jumping in below:

What is soy protein powder?

Very soon, we’re going to share our reviews of a whole range of products so that you can find the best soy protein powder for you. But first, we thought we would answer any questions that you might have about soy protein, starting by ‘what is it?’. Here we go!

Soy protein originates from the soya bean, a staple in most vegan diets due to its high protein content. Soy protein powder is made by processing soybeans until they become soy protein isolate. 

Unsure of how to eat soy protein powder? As with other kinds of protein powder, it can be used to make protein shakes or added into meals to increase your protein intake. 

This protein is a complete protein which means it has all of the essential amino acids (EAA) that your body requires. 

Amino acids are vital for your body to grow and function correctly. Nine of the amino acids cannot be made within the body. These are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. 

Because your body can’t make these amino acids, they must come from food. Amino acids are part of many animal protein foods like eggs and meat, but also some plant-based food staples such as soy, quinoa, and buckwheat. Hence, soy protein is vital for people who follow a plant based diet as they cannot eat animal products!

Now you know what soya protein is and why it is an important part of your diet (especially if you’re a vegan!), let’s find out if soy is actually better than whey!

What is better soy or whey protein powder?

When it comes to the ‘best kind of protein’, there’s no one size fits all approach! It really does depend on your individual goals, preferences, and dietary requirements. 

Even within the categories ‘whey’ and ‘soy’, the quality of protein powders will still differ from brand to brand. 

There is a much larger selection to choose from when it comes to whey protein so you can be spoilt for choice. Whey protein tends to be smoother and has a creamier texture as you drink them. Meanwhile, soy protein has a slightly more grainy texture, but again, it’s down to personal preference. 

However, if you’re looking to cut back on dairy, or you are lactose intolerant or vegan, your best bet would be to go for soy protein as you will still get the same amount of protein per serving as the whey protein. 

If you do not know how to use soy protein powder, don’t worry, you can still use it like regular whey protein and drink it as part of a shake before or after your workout. 

Now you know what it is, let’s find out where to buy soy protein powder!

Best Soy Protein Powders (UK)

#1 – BULK POWDERS – Pure Series Soya Protein Isolate 90

Price: from £6.29

soy powder protein

Bulk Powders sell a large selection of protein supplement powders in various flavours. BULK are among the more popular supplement brands out there, with thousands of 5 star reviews on Amazon.

Their powder is made with purely 100% soy protein and is arguably the best soy protein isolate powder you can find on Amazon.

Wondering ‘what is soy isolate protein?’ Well, soy isolate is made from soybean flakes and has been thoroughly washed in alcohol or water to remove any sugars or fibre. After this process, the flakes are dehydrated and then turned into a powder ready to be sold. 

The protein powder is low in carbs and fat while being high in protein, with 27g of soy protein per serving!

Their soya powder also contains a high presence of BCAA’s, with two essential amino acids measuring in at 5g of glutamic acid and 2g of arginine per serving.  

This product is an unflavoured soy protein powder, common with other soy protein isolate powder products, so don’t be afraid to experiment with your protein shake if you want a more flavoursome taste!  

Bulk Powders sell their Pure Series Soya Protein Isolate 90 powder in 500g, 1kg, and 2.5kg sizes, meaning that you can buy as much as you want and for a price that is right for you too.

Speaking of price, don’t be put off by the fact that this is a cheap soy protein powder. Although this isn’t the most expensive product on our list, it's still a great quality option and is one of the best rated options according to previous buyers! 

This BULK POWDERS product has some of the best soy isolate protein powder reviews we’ve seen, making it an excellent value proposition for anyone looking for soy protein supplements.

If you do not follow a plant based diet but are looking for similarly priced protein powders, look at OriGym's article on the cheapest protein powders you can find online. 

#2 – Pulsin Soya Protein 

Price: from £4.99

soy protein shake powder

Pulsin has created a great all natural soy protein powder. Not only are their products as natural as possible, but they can also be used in various meals and recipes as opposed to just protein shakes. 

Pulsin’s gluten free soy protein powder is rich with isoflavones – a polyphenol that contains many health benefits – and packed with BCAA’s (branch chain amino acids) such as glutamic acid, aspartic acid, and arginine.  

If you’re wondering ‘what is the best soy protein powder for weight loss?’, Pulsin's soy gluten free protein powder could be a great choice for you as each serving is low in calories. 

Plus, because this protein powder is designed to be used in meals, you don’t have to consume a high-calorie soy protein shake on top of your daily meals. 

If that wasn’t enough to convince you that this is a great product, Pulsin also has some of the best soy protein powder reviews on Amazon, with 84% of their 461 reviews being 4 or 5 stars. 

Try their natural soy protein powder, and you won’t be disappointed. In fact, this product is selected as Amazon’s Choice for the soy protein powder category, which represents its great price to rating combination. 

#3 – Myprotein – Gluten Free Soy Protein Powder

Price: £15.99

soy wheat protein powder

This Myvegan Soy Protein Isolate powder from Myprotein is made using an innovative process of extracting protein from defatted soybeans, resulting in a sugar free soy protein powder that uses sucralose as a sweetener. 

With one serving offering a generous 27g of soy protein, this powder is an easy way to quickly boost your protein intake if you follow a plant-based diet.

Simply pair the powder with your dairy-free milk of choice, and you have an excellent soy protein powder shake ready to go for after your workout. 

What’s more is their soy protein powder comes in a choice of flavours, so if you want their soy protein powder in vanilla or chocolate, you can choose either! 

It is also great to know that this product is also gluten-free. If you ask us, this is definitely the best soy based protein powder you can find on this list! 

Are you a fan of the Myprotein range? Check out our reviews of the best pea protein powders to see where they rank!

#4 – SCI-MX Nutrition Pro V-Gain Plant Based Protein Powder

Price: £27.95

what is the best soy protein powder for weight loss

While not strictly just a soy protein powder, SCI-MX’s ‘plant based’ Pro V-Gain protein powder contains a blend of protein from plant sources made up of non-GMO 90% soy protein isolate, non-GMO 85% pea protein, and non-GMO 84% rice protein. 

Per serving, this protein powder by SCI-MX contains 33g of protein! This is a large amount for a single serving, especially considering that an adult male’s average protein intake for an adult male is around 55g per day.

Their soy protein powder in chocolate comes very highly rated, as do their strawberry and vanilla flavours, too. 

If you’re looking for the best soy based protein powder reviews, then this product with over 1000 reviews should be a great choice for you as 86% of these reviews come in at 4 or 5 stars!

However, one important note is that SCI-MX’s protein powder is produced in a shared factory that also produces other products that contain gluten, milk, eggs, nuts, and fish. So if you are allergic to any of these or don’t want to risk any contamination (no matter how small the chance), then maybe opt for another product on our list. 

#5 – The Protein Works Soy Protein Isolate 90

Price: from £10.99

soy protein powder for weight loss

The Protein Works are another top supplement brand in the UK. With no added sugar, 0.2g of fat per serving, and 25g of purely plant-based protein, their Soy Protein Isolate 90 range is a solid choice for anyone looking for great tasting soy protein powder shakes.

One of The Protein Works’ unique selling points is the range of flavours available in their products. 

If you have a sweet tooth and aren’t interested in other unflavoured soy protein powders (although they do sell an unflavoured version), then choose your favourite flavour of soy protein powder like chocolate mint brownie, chocolate peanut cookie, chocolate silk, millionaire’s shortbread, vanilla, and vanilla crème.

If a great tasting protein powder is important to you, then The Protein Works’ Soy Protein Isolate 90 range should be the best soy based protein powder for you. 

Looking for a shake to supplement a meal? Take a look at OriGym’s recent article on the best vegan meal replacement shakes, you can find online. 

#6 – Bodybuilding Warehouse – Pure Vegan Soy Protein Isolate

Price: from £8.98

pure soy protein powder

Available in a range of sizes from 500g to 4kg, this Vegan Soy Protein Isolate Powder is a great choice of supplement for anyone wanting to buy their protein in bulk. 

This product is the best unflavoured soy protein powder for men. If you’re concerned about calories, this product works great with water! If you want to know how to make a soy protein shake taste better, you can just easily mix with your choice of milk and flavourings to create a more indulgent post-workout treat!

Speaking of post-workout, high-quality protein consumption after training has been shown to help increase muscle growth and prevent muscle soreness after exercise. This makes your choice of protein intake post-workout important, as well as your method of delivery. 

Protein shakes, such as this option from Bodybuilding Warehouse, provide a quick hit of high-quality, easily digestible protein, that may suit some people more than eating a full meal. 

If you’re looking for vegan bodybuilding soy protein powder, then look no further, as this protein supplement is made of 100% pure soy protein isolate which is completely vegan and gluten free at the same time.  

#7 – PhD Nutrition Smart Protein Plant

Price: £14.99

100% soy protein powder

Amazon’s Choice for PhD plant protein powder, this salted caramel flavour is extremely popular with consumers. This is shown through the hundreds of positive soy-based protein powder reviews for this particular flavour. 

PhD Nutrition is another well-known protein supplement brand that you may be familiar with from OriGym's best protein cookies article. Their products are well made, well received, and consistently high quality; a great trifecta of properties that make PhD successful at what they do. 

You’ll find a pea protein and soy protein powder blend in this item to create a healthy, vegan friendly protein powder. 

To top this off, the salted caramel flavour makes the protein powder taste delicious. 

PhD recommend several recipes that are a perfect match for the salted caramel taste, and, of course, they also advise the good old fashioned protein shake. 

#8 – Peak Supps Soy Protein Isolate

Price: £10.99

fermented soy protein powder

This soy isolate protein powder from Peak Supps is available in a variety of purchase options. Their standard 1kg bag is £10.99, yet you can purchase 5 bags for a discounted price, or even buy a 50g sample bag if you just want to give it a try.

This protein source comes from a soy lecithin protein powder, which means it may be a suitable choice for people trying to deal with high cholesterol. 

Total calories from this supplement remain low while the protein count is high, with 109 calories and 27g of protein per serving. This is great news for anyone looking to find ways to increase muscle growth rate and fast track recovery post-workout without adding too many calories to their diet. 

As well as this, the pure soy protein powder also contains a high and varied mix of BCAA’s which are useful for anyone who frequently exercises and wants to enhance their performance in the gym.

#9 – Deluxe Nutrition Soy Isolate Protein

Price: £26.99

best organic soy protein powder

Deluxe Nutrition sells its unflavoured soy isolate protein powder in a large 2.5kg tub for a reasonable price of £26.99. 

If you frequently hit the gym hard, you will benefit from taking this supplement. A post-workout hit of Deluxe Nutrition’s Soya Isolate Protein will have you on the path to muscle growth and recovery very quickly.

As it is unflavoured, you can have it whatever way you like. Dairy-free milk will ensure your product remains lactose free and suitable for vegans, too. 

If you’re feeling creative, you could go even further with this product and choose to add fruit for a flavoured shake! Otherwise, you can consume the product with water for a quick and easy protein intake solution.  

Made up of 90% protein and containing a well-rounded mix of BCAA’s, this is a solid option for someone who wants an efficient soy protein powder with no fuss. 

Do you need an extra boost of BCAA’s? Why don't you try BCAA tablets for the extra boost before or after your workout! 

#10 – Naturade Total Soy Weight Loss Shake

Price: £29.69

best soy based protein powder

If your exercise goals include maintaining muscle mass or cutting body fat, or you’ve landed on this post in search of the best soy protein powder for women or weight loss, this could be the product for you.

At only 130 calories per serving, this meal replacement is a quick and efficient snack and serves as a great way to keep your protein intake high without consuming too many calories.

As this product is derived from a non-GMO soy protein source, the base product is lactose and gluten free.

What does non-GMO soy protein mean?. If a protein shake is non-GMO it means the product was produced without any genetic engineering. Ingredients like edamame, tofu and tempeh are all non-GMO protein sources.   

This product is targeted as a soy protein powder for women, and it comes very highly rated on Amazon with 89% of its 321 reviews being at 4 or 5 stars!

Although the protein per serving is not the highest for a soy protein powder (with just 13g of protein per serving), this is still a suitable amount alongside a balanced diet. 

If you are looking for soy protein powder for men and women who want to bulk up, this product probably isn’t the best option. However, if you are looking for a light meal replacement that isn’t lacking in protein and vitamins, then this shake might just be the perfect product for your needs. 

#11 – Nature’s Plus SPIRU-TEIN Shake 

Price: £22.15

cheap soy protein powder

If you are looking for a soy protein shake powder that is made with the superfood supplement spirulina, then Nature’s Plus SPIRU-TEIN Shake will be exactly what you’re after!

Spirulina is a type of cyanobacteria, an algae found in salt and freshwater that contains tons of health benefits. With benefits including lowering cholesterol, improving oxidative muscle strength, and so much more, spirulina can positively impact your health. 

It would take too long to list every single health claim attributed to spirulina, so we encourage you to do some more research and see if this supplement would benefit you as part of your daily routine. 

The source of protein that this product uses is a fermented soy protein powder. Fermented soy is a much better protein source than a soy protein concentrate powder, especially for your general health. 

This product comes in a variety of flavours, including strawberry, banana, chocolate, and vanilla. On top of this, per serving this protein powder provides 14g of protein. 

While this may not be a lot compared to other soy protein powders on our list, this product has plenty of extra health benefits that others do not have. The protein powder includes added fibre from bran, cellulose, and apple pectin.

If you are looking for a soy spirulina protein powder, this is a solid choice and available on Amazon for delivery in the UK.  

If you need somewhere to store your shake and meals all in one place, take a look at the following articles to help you out: 

#12 – Nature’s Sunshine – Soy Protein Shake

Price: £19.95

soy protein powder shakes

Nature’s Sunshine’s SynerProTein is unique compared to other soy protein powders on this list as it contains a couple of additional nutrients that you don’t typically find in most supplements. 

The SynerPro Concentrate mix comprises a range of whole foods such as broccoli, carrot, red beet, rosemary, tomato, turmeric, cabbage, and grapefruit. This means that this soy protein isolate powder from Nature’s Sunshine is nutrient dense and high in protein.

On top of this, the antioxidants from the whole foods and their health benefits, including turmeric, can be very beneficial when reducing heart disease risks or dealing with carcinogens in the body. 

Aside from what makes this soy protein powder unique, it also contains the benefits of most other soy protein supplements. 

This product is suitable for vegans, gluten-free, and comes from a non-GMO source of soy. 

Nature’s Sunshine claim that the formula behind their SynerProTein mix comes from Dr James Scala, a nutritionist for NASA – so if you want a supplement that comes backed by science (or just want bragging rights over your mates!) then opt for this soy protein powder.   

#13 – iSatori Soy Protein 

Price: £15.95

soy gluten free protein powder

iSatori’s Soy Protein isolate powder comes in a 500g bag and is available in a Rich Chocolate flavour. Their serving sizes specify a 25g scoop per serving, which means that one tub of iSatori Soy Protein will last you 20 servings.

Made with Supro soy protein powder, which is designed to be more viscous than other soy powder proteins, iSatori Soy Protein’s serving provides 19g of protein and less than 1g of carbohydrates and 1g of fat. 

On top of this, a serving of protein provides only 87 calories. This, combined with very low carbohydrate content, perfect for if you workout while intermittent fasting. 

As the protein comes from a soy source, this protein powder is both vegan and lactose free. It also contains rich cocoa powder, and it will taste delicious no matter what you decide to mix it with. 

Do you need a shaker to drink the protein from? Don’t worry, OriGym have listed the best protein shakers to help you hit your protein on the go! 

#14 – Buy Whole Foods Online - Organic Soy Protein Powder

Price: from £4.48

soy lecithin protein powder

This Buy Whole Foods soy protein powder is a great low fat vegan option for anyone looking for protein supplements in the UK. 

This particular soy protein powder contains ‘nil’ carbohydrates, and so if you are looking for a soy protein powder for diabetics, then this may be a great choice to help keep your blood sugar in check. 

In fact, now that we’re on the subject, we should discuss the potential benefits that soy has for people with diabetes. Soy products contain isoflavones - phytoestrogens derived from plants with estrogenic activity. 

While these compounds have some contentious properties among scientists and health professionals, what is known is their ability to lower blood pressure by producing nitric oxide that opens blood vessels. 

On top of this, there is also research on whether isoflavones lower blood glucose and insulin levels. 

As far as soy protein powders go, this one from Buy Whole Foods Online is a good choice. With 27g of protein per serving and the ability to purchase a small sample size of 250g to see if you like it, there is a lot to offer here for customers looking for a good offer. 

And if you are looking for a specific organic protein supplement, then this product from Buy Whole Foods Online could be the best organic soy protein powder in the UK for you. 

#15 – GNC Earth Genius Soy Protein 

Price: £15.43

best soy protein isolate powder

If you’re located in the United States or live in a European mainland country like Spain, Portugal, Italy, the Netherlands, or Belgium, then GNC soy protein powder can be a good protein supplement choice. 

This particular product has plenty of positive GNC soy protein powder reviews on their website, and, similar to the Buy Whole Foods product listed above, contains no carbohydrates. 

GNC markets their product as having naturally occurring isoflavones, which are the compounds found in soy products that can benefit people with high blood pressure, cholesterol, or blood sugar. 

On top of this, if you are looking to round off your diet by including a mix of all essential amino acids, this product will suit you. It contains all essential amino acids in the form of BCAA’s, all while being cholesterol and sugar free! 

If you’re looking to get into weight training, but you have no idea where to begin, OriGym has created a step by step guide on vegan weight training!

FAQ’s

How much soy protein is too much?

Like with most foods you eat, everything in your diet needs to be varied and balanced. As mentioned before, having soy protein is a great way to cut back on dairy and meat. 

Unsure of how many grams of soy protein to consume per day? According to Healthline,  if you eat or drink 25 grams of soy protein per day, which is the average amount of protein per shake, it’ll help reduce the bad cholesterol (LDL) by up to 3%. 

You don’t have to worry and think ‘how much soy protein per day should I eat and drink?’, as you’d have to consume an awful lot of this protein powder to see any serious side effects. At the same time, even having the odd soy protein shake will have some benefit and will help you to swap meat and dairy out of your diet.

What are the drawbacks of soy protein?

With all food and drink, there will be people asking ‘why is soy protein bad for you?’ One concern about soy is that it is thought to affect thyroid function. However, in a study by Messina et al, eating soy protein was found to have very mild or no thyroid function effects.

Another reason that some people steer away from soy protein is because of its phytoestrogen content. If you didn’t know, phytoestrogens are chemical compounds with estrogen properties that help bind to your body. If you eat foods that contain high amounts of phytoestrogen content, it could disrupt your natural hormone levels. 

However, the initial process of making soy protein often means that a significant portion of phytoestrogen is removed by rinsing the soybeans with alcohol and water. 

So to anybody asking ‘why is soy protein bad for you?’, the answer is that soy is safe for most people and isn’t bad at all! The potential drawbacks that have been listed above is for soy as a whole rather than soy protein. 

Before you go!

The soy protein powders listed above are the best 15 you can find online! Each product has its selling points, but we know you will love whichever one you choose.

Compared to other vegan protein sources, drinking soy protein blows the competition out of the water when it comes to the amount of protein you receive from each shake. 

If you’re interested in a career in the fitness industry, look at the different types of personal trainer course packages we have available. 

Otherwise, download our free prospectus for more information! 

References

Messina et al. 2006. Effects of Soy Protein and Soybean Isoflavones on Thyroid Function in Healthy Adults and Hypothyroid Patients: A Review of the Relevant Literature. Available at: https://www.liebertpub.com/doi/abs/10.1089/thy.2006.16.249

Goodson, 2018. Soy Protein: Good or Bad? Available at: https://www.healthline.com/nutrition/soy-protein-good-or-bad#bottom-line

Written by Zac Yeo

Fitness Content Executive, OriGym

Join Zac on Facebook at the OriGym Facebook Group

With a BA (Hons) Politics and International Relations from Kingston University and previous experience working in the finance sector, Zac’s passion for fitness brought him to OriGym, and ultimately led him to become a qualified Personal Trainer and Nutrition Specialist. With a keen interest in developing consumer trends, Zac enjoys the creation of deep, insightful content catering to new trends and has contributed to various publications including the Daily Star. Outside of work, Zac can be found watching football, either in-person supporting Charlton Athletic or virtually on Fifa.

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