Optimum Nutrition Gold Standard Plant Protein Review


Flavors: Vanilla, Chocolate

Optimum Nutrition has a reputation of producing products that are basically the gold standard for supplement quality.

I was really excited when I heard that Optimum Nutrition came out with a vegan protein powder: Optimum Nutrition Gold Standard 100% Plant.

It was a little tricky to find a site that ships to Canada, but Muscle and Strength carries small quantities every now and then.

If you’re in the United States, you’ll have no problem finding it in most stores, including Amazon.

Like all my vegan protein powder reviews, I’ve broken this review down into the 4 most important aspects of a protein powder.

Each section has a score out of 25.

You can see how ON compares to other top vegan protein powders here.


While a protein powder can provide nutrition like vitamins and minerals, the only thing that really matters is protein content.

You drink protein shakes to get protein. If you want that other stuff, that’s what spinach is for.

So to calculate a nutrition score, I use the formula below. You can see how I came up with it and others on my testing methodology page.

Protein powder nutrition score formula

Keep in mind that this score is relative.

A score of 25 means that the protein powder has about as much as possible in a protein powder, while a score of 0 means that it has a smaller protein content than almost all other powders.

We can calculate this score by looking at the nutrition label:

optimum nutrition gold standard plant nutrition

Plugging in 96 calories from 24 grams of protein, and 150 calories in a serving, we get a nutrition score of 18.

That’s pretty average for a vegan protein powder.

If you’re looking for a protein powder that has the highest protein content possible, this is pretty disappointing.

Ingredients list:

The ingredients are all organic, if that’s important to you. But it’s also a very long list of ingredients compared to some powders that only have 5 or fewer ingredients total.


Next up is cost.

The price score gives you an indication of how cheap a protein powder is compared to the rest.

A score of 25 means that it’s extremely cheap, while a score of 0 means that it’s more expensive than most.

ON Gold Standard Plant only comes in 1 size: 722 g / 1.59 lb.

Again, I have a linear formula that translates the price per 100 grams into a score from 0 to 25:

Protein powder pricing score formula

In this case, it produces a pricing score of 13.04.

Again, very middle of the pack. It’s not crazy expensive, but there are many cheaper vegan protein powders.


Another important aspect of a protein powder is being able to mix it without a ton of clumps forming, which generally make the protein shake a chore to drink.

I’ve developed a simple, realistic scenario to test each protein powder with:

  1. Put 450 mL of unsweetened almond milk in a shaker bottle
  2. Add in 35 grams of the protein powder
  3. Shake for 45 seconds
  4. Pour the shake through a fine strainer, and weigh the clumps that are filtered out.

Once I have the weight of the clumps (“remnants”), I plug it into the following formula:

Protein powder mixability score formula

Again, this spits out a number relative to the mixability of the other protein powders I’ve tested.

A score of 25 means that it mixes perfectly, while a score of 0 means that there is a ton of clumps formed.

In this case, there was only 1 gram of remnants, so it gets a mixability score of 21.88.

You can see the very small amount of clumps left in the strainer below:

ON protein strainer

You barely notice them when you’re drinking a shake.

This was the most positive aspect of the product for me.


Finally, you want a protein powder that tastes good.

Obviously this is subjective, but I try to justify my reasons and assign taste scores according to this table:

Taste Score Meaning


Amazing, would drink for enjoyment alone.


Very good.


Drinkable, not really good or bad.


A bit of a struggle to get down


Quite bad

Whereas most protein powders suffer from being “chalky”, this one was more “grainy”. I personally would prefer this if I had to choose between the 2 textures. It’s mostly smooth, but you can feel extremely fine grains in there as well.

The other issue is that there’s an aftertaste. It’s not a terrible one, I’ve had multiple protein shakes with worse aftertastes during my testing, but it is significant, and not pleasant.

So for those 2 main reasons, I was leaning between 15-20, but I feel it’s much closer to the lower end.

It tastes okay to drink, but I’d never say it’s very good.

That’s why I’ve given this protein powder a taste score of 15.

Summary and Overall Review Impressions

I had high hopes coming into this considering it was made by ON, but was pretty disappointed.

If you add up those individual scores, you get an overall score of 65, which is right around the middle of all the protein powders I’ve reviewed.

Optimum Nutrition Gold Standard 100% Plant is very average in all the categories, except that it mixes above average.

If it’s easily available to you, or you like the company, give it a try.

I wouldn’t actively say not to buy it if you want to, I just wouldn’t strongly recommend it either.

In most situations, based on the data I’ve collected, there are better options for you if you're willing to keep researching.

Here are a few alternatives you might like: