Why vegan protein used to be more expensive
Until a few years ago, producing plant protein at the purity and palatability required for a mainstream supplement product required expensive processing. Whey, a byproduct of cheese manufacturing, had a built-in cost advantage as an abundant raw material with decades of processing infrastructure behind it.
Demand for plant-based products has scaled manufacturing rapidly. Pea protein in particular has seen significant investment in processing capacity, which has driven down raw material costs. The gap between whey concentrate and pea protein pricing has narrowed substantially.
How to compare vegan protein by true value
Cost per gram of protein is the only fair comparison metric. Tub price varies with pack size, and protein percentage varies between products — a product with 65g protein per 100g is delivering less protein per pound spent than one with 80g per 100g at the same price.
To calculate: take the tub price, divide by the total protein content of the tub in grams. A 1kg tub at 75% protein gives 750g of protein. At £20, that is 2.67p per gram of protein. This number is what you compare across products.
What typically wins on value
Larger packs almost always give a better cost per gram. A 2.5kg or 5kg bag from a major brand during a promotional period is usually the cheapest way to buy vegan protein in the UK.
Single-ingredient pea protein powder — unflavoured — is generally the cheapest format by cost per gram of protein. Blended products with additional ingredients, premium flavouring or added vitamins cost more. Decide whether those additions are worth the premium to you before buying.
Brands worth comparing in the UK
The major volume suppliers of vegan protein in the UK — Bulk, Myprotein, and similar direct-to-consumer brands — regularly discount large bags. These promotional prices are often the cheapest available, sometimes beating budget own-brand alternatives on a per-gram basis.
Discount varies week to week. The best approach is to compare live prices using a price comparison tool rather than relying on a single snapshot — the ranking changes with each sale cycle.
What to sacrifice and what not to
It is reasonable to sacrifice brand recognition, flavour variety, and premium packaging in pursuit of lower cost. These do not affect the protein's function.
It is not reasonable to sacrifice protein percentage below around 65g per 100g, amino acid completeness (prefer blends over single-source), or basic third-party testing. A cheap product that is poorly formulated delivers less value per gram than a slightly more expensive well-formulated one.