Vegan Protein Powders: Amino Acid Profiles Compared

Quick Verdict

The biggest issue with vegan protein is not total protein — it is leucine content. Leucine triggers muscle protein synthesis, and you need roughly 2.5g per serving to maximise the response. Most vegan proteins deliver 1.5-2g, falling short of the threshold. Pea + rice blends offer the most complete amino acid profile. Form Nutrition leads on leucine. Budget options work but may need a leucine top-up.

Product Overview

Factor	Myprotein Vegan Blend	Bulk Vegan Protein	Form Performance	PhD Plant Protein	AN Vegan Pro
Price (1kg)	~£18	~£20	~£32 / 520g	~£22	~£20
Servings	33	33	13	25	30
Cost per serving	~£0.55	~£0.61	~£2.46	~£0.88	~£0.67
Protein source	Pea + brown rice	Pea + pumpkin seed	Pea + rice + added leucine	Pea + soy	Pea + rice + soy

Nutritional Comparison (Per Serving)

Per Serving	Myprotein Vegan	Bulk Vegan	Form Performance	PhD Plant	AN Vegan Pro
Serving size	30g	30g	40g	40g	33g
Protein	22g	23g	30g	26g	24g
Calories	110 kcal	118 kcal	163 kcal	155 kcal	125 kcal
Fat	0.5g	1.5g	2g	3g	1g
Carbs	1g	1g	3.5g	6g	2g
Protein %	73%	77%	75%	65%	73%

Amino Acid Profile Comparison

This is where vegan proteins genuinely differ. These are approximate values per serving:

Amino Acid	Target	Myprotein Vegan	Bulk Vegan	Form Performance	PhD Plant	AN Vegan Pro
Leucine	2.5g+	1.6g	1.7g	3.0g	2.0g	1.8g
Isoleucine	—	0.9g	1.0g	1.4g	1.1g	1.0g
Valine	—	1.0g	1.0g	1.4g	1.2g	1.1g
Total BCAAs	—	3.5g	3.7g	5.8g	4.3g	3.9g
Lysine	—	1.4g	1.3g	1.8g	1.5g	1.4g
Methionine	—	0.3g	0.4g	0.5g	0.4g	0.4g

The Leucine Threshold Problem

Muscle protein synthesis (MPS) is not simply proportional to total protein intake. It requires a minimum leucine concentration — roughly 2.5g per meal — to fully activate the mTOR signalling pathway that drives muscle repair and growth.

Whey protein naturally delivers ~2.5g leucine per 25g scoop. Most vegan proteins deliver 1.5-2g per similar serving. This is the single biggest disadvantage of plant protein for muscle building.

Form Nutrition solves this by adding free-form leucine to their blend, pushing the total to 3g per serving. It works, but at £2.46 per serving, it is expensive.

How to Fix Leucine in Budget Vegan Protein

Buy leucine powder separately and add 1-1.5g to each shake:

Approach	Cost per serving	Leucine per serving
Myprotein Vegan Blend alone	£0.55	1.6g
Myprotein Vegan + 1.5g leucine	~£0.62	3.1g
Form Performance alone	£2.46	3.0g

Adding leucine powder costs roughly 7p per serving and brings a budget vegan shake to the same leucine level as Form at a quarter of the price. Myprotein and Bulk both sell leucine powder for around £10 per 250g (166 servings at 1.5g).

Protein Source Breakdown

Pea protein — high in lysine, lower in methionine. Good BCAA profile. Slightly gritty texture.

Brown rice protein — higher in methionine, lower in lysine. Complements pea protein perfectly when blended.

Soy protein — complete amino acid profile (all essential aminos present). Some people avoid it due to phytoestrogen concerns, though research does not support negative effects at normal supplemental doses.

Pumpkin seed protein — provides methionine and tryptophan that pea lacks. Less common but nutritionally complementary.

Pea + rice is the gold standard combination for vegan protein, producing an amino acid profile that approximates whey.

Texture and Mixability

This matters for compliance. Vegan proteins are historically chalky and gritty compared to whey.

Form Nutrition has invested heavily in formulation and is genuinely smooth — closer to whey than any competitor. Myprotein and Bulk are thicker and grainier, best blended rather than shaken. PhD Plant is mid-range. AN Vegan Pro mixes reasonably well.

If texture is a dealbreaker, Form justifies some of its premium here. Otherwise, a blender solves the problem for any brand.

Who Each Product Suits

Myprotein Vegan Blend — best value. Add leucine powder separately and you match premium options at a fraction of the cost.

Bulk Vegan Protein — similar to Myprotein with a slightly different protein source blend. Good alternative.

Form Performance Protein — the premium choice for those who want a fully optimised, great-tasting vegan shake without additions. The cost is high.

PhD Plant Protein — includes soy for a more complete profile but lower protein percentage. Decent but not the best value.

AN Vegan Pro — solid all-rounder with a triple protein source blend. Good middle ground.

Where to Buy

For more on plant-based protein, see our vegan protein powder guide.