For shakes, compare protein per 100ml if that matters to your choice; for regular household use, compare sugars and fortification on the exact carton. A long-life 1-litre carton can be kept unopened as its label directs, but it is not an unrefrigerated gym-bag drink once opened. Smaller individual cartons are a different option for portioned snacks, subject to their own storage instructions.
Who is choosing?
People making gym-day shakes
If soya drink is an ingredient in your shake, compare protein on the same per-100ml basis rather than relying on a product name. Alpro UK lists 5.0g per 100ml for its Soya High Protein drink; Waitrose & Partners lists 3.4g for Essential Unsweetened.
Households buying a regular carton
An unsweetened drink may suit a household that wants to avoid sugars in its soya drink. The Waitrose & Partners Essential Unsweetened carton lists 0g sugars per 100ml and added calcium, iodine and vitamins; check the label of any other carton you are considering.
Families checking a drink for a child
Age and dietary needs matter as well as carton size. NHS North West Knowledge Now’s February 2026 guidance discusses unsweetened fortified soya and pea drinks for children aged 1+ in the context of cow’s-milk-protein allergy. For a child with an allergy or restricted diet, seek individual advice from a healthcare professional.
What should you check?
Decide whether the drink is mainly for shakes, shared household use or individual snacks, then compare the exact pack’s nutrition and storage instructions.
| Priority |
What to check |
Your needs |
| Protein |
Compare protein per 100ml and the amount you will use. Alpro UK lists 5.0g per 100ml for Soya High Protein; Waitrose & Partners lists 3.4g for Essential Unsweetened. |
I use soya drink in shakes and want to compare how much protein the drink contributes. |
| Sugars |
Read the sugars figure per 100ml; a high-protein name does not mean unsweetened. Alpro UK lists 2.5g for Soya High Protein, while Waitrose & Partners lists 0g for Essential Unsweetened. |
For a carton used regularly at home, I would rather choose an unsweetened drink than assume all soya drinks are alike. |
| Fortification |
Check which nutrients are listed on the exact carton. Waitrose & Partners lists added calcium, iodine and vitamins D, B12 and B2 for Essential Unsweetened. |
If the household uses soya drink in place of a dairy drink, I want to know what has been added to the product I buy. |
| Storage and size |
Check unopened storage separately from instructions after opening. Waitrose & Partners says to refrigerate Essential Unsweetened below 5°C and use it within 3 days of opening; its Alpro Original listing specifies +1°C to +7°C and 5 days. |
I can keep a family carton for planned use, but need a way to keep it chilled after opening. For a portioned gym-bag snack, I would check an individual carton’s storage instructions instead. |
| Ingredients |
Read the current ingredient and allergen label, particularly if soya is a concern. GOV.UK explains that food businesses must declare specified allergens when they are ingredients. |
Dairy-free is not the same as soya-free; I need to check the actual drink rather than rely on a front-of-pack description. |
Common buying mistakes
-
Treating every soya drink as interchangeable
Products can differ on the measures relevant to your choice. Alpro UK lists 5.0g protein and 2.5g sugars per 100ml for Soya High Protein; Waitrose & Partners lists 3.4g protein and 0g sugars for Essential Unsweetened.
Compare the nutrition panels per 100ml before buying several cartons of the same drink.
-
Putting an opened family carton in a gym bag
Long-life storage before opening does not remove the need to refrigerate afterwards. Waitrose & Partners specifies below 5°C and use within 3 days for its Essential Unsweetened carton; its Alpro Original listing gives a different temperature range and a 5-day period.
Follow the instructions on your carton after opening. For a drink to carry as a single portion, check the individual pack’s storage directions.
A 1-litre carton may also be impractical if you cannot use it within its stated refrigerated period.
-
Assuming dairy-free means suitable for every allergy
A soya drink is not a soya-free choice. Suitability for a child with a medically restricted diet needs more than a general family-use description.
Check the current ingredient and allergen label. Seek healthcare-professional advice when choosing for a child with an allergy or restricted diet.
Brand and retailer references
These examples show why it is worth checking the specific product rather than treating a brand’s entire range as one type of soya drink.
Alpro
Alpro UK lists a Soya High Protein 1L drink, while a separate Alpro Original long-life drink appears in a Waitrose & Partners listing.
- Alpro UK lists 5.0g protein and 2.5g sugars per 100ml for Soya High Protein.
- Check the exact variant and its storage directions; the Waitrose & Partners Alpro Original listing says to refrigerate after opening and use within 5 days.
Waitrose Essential
The Essential Unsweetened 1-litre drink is a specific example of an unsweetened, fortified household carton.
- Waitrose & Partners lists 0g sugars and 3.4g protein per 100ml, with added calcium, iodine and vitamins D, B12 and B2.
- After opening, Waitrose & Partners says to refrigerate it below 5°C and use it within 3 days.
Tesco
A Tesco Groceries long-life drinks listing includes Alpro High Protein Soya Original 1L.
- The listing gives shoppers another place to compare an identifiable 1-litre Alpro product.
- Check the current product page and carton for the variant, ingredients and storage instructions before buying.
Joybuy soya drink options
These options include a 1-litre Alpro drink and smaller Vitasoy cartons that may suit portioned snacks. Check pack quantity and storage directions before deciding whether a listing fits household stock or a gym bag.
No image available
Alpro Plant Protein 1L, listing marked 6
A 1-litre format to consider when soya drink is an ingredient in planned household shakes. The listing title includes “6”, but the carton count needs checking before you buy; also check the exact pack’s nutrition and storage instructions.
View on Joybuy
No image available
Vitasoy Regular Soya Drink 8x6x250ml
The 250ml carton format is worth considering for individual snacks rather than pouring from a family-size carton. Check the pack’s unopened storage instructions before carrying one in a gym bag, and read its sugars and fortification information if those affect your choice.
View on Joybuy
No image available
Vitasoy Malted Soy Milk 250ml × 6
Six individual 250ml cartons offer a portioned alternative to a 1-litre household carton. Check the exact pack’s sugars, ingredients and unopened storage instructions before choosing it for regular use or a gym bag.
View on Joybuy
Frequently asked questions
Can an opened long-life soya carton stay in a gym bag?
Do not treat long-life status as permission to leave a carton unrefrigerated after opening. Waitrose & Partners says its Essential Unsweetened drink must be kept below 5°C and used within 3 days of opening; its Alpro Original listing specifies +1°C to +7°C and use within 5 days. Follow the directions on the carton you buy.
Does a high-protein soya drink also mean less sugar?
No: those are separate label figures. Alpro UK lists 5.0g protein and 2.5g sugars per 100ml for Soya High Protein, while Waitrose & Partners lists 3.4g protein and 0g sugars for Essential Unsweetened. Compare both figures on the exact drink.
What matters when choosing a soya drink for a child?
Check the child’s age, the drink’s label and any individual dietary restrictions. NHS North West Knowledge Now’s February 2026 guidance describes unsweetened fortified soya and pea drinks as first-choice plant alternatives for children aged 1+ in its cow’s-milk-protein-allergy context. Ask a healthcare professional about suitability for a child with an allergy or restricted diet.
Does dairy-free mean a soya drink is suitable for a soya allergy?
No. A soya drink is not soya-free. Check its current ingredient and allergen label rather than relying on a dairy-free description; GOV.UK explains that food businesses must declare specified allergens when they are ingredients.