Proteins
Whey protein
Also called: whey, whey isolate, whey concentrate
Protein from milk, quickly digested and rich in leucine.
- Why people take it
- Muscle building, recovery, meeting protein needs.
- What the evidence says
- Good evidence for supporting muscle gain with strength training when total protein is low.
- How it is usually taken
- Usually 20 to 40 g per serving, mixed in water or milk; count it toward total daily protein (about 0.8 g per kg, 1.2 to 2 g per kg for training).
- Be careful
- Contains milk; may upset people with lactose intolerance. Check for added sugar and third-party testing.
- Medicines it can interact with
- Can reduce absorption of levodopa, levothyroxine, quinolone and tetracycline antibiotics and bisphosphonates; separate by 2 hours.
Other proteins
Common questions
What is Whey protein?
Protein from milk, quickly digested and rich in leucine.
Why do people take Whey protein?
Muscle building, recovery, meeting protein needs.
Does Whey protein work?
Good evidence for supporting muscle gain with strength training when total protein is low.
How much Whey protein do people take?
Usually 20 to 40 g per serving, mixed in water or milk; count it toward total daily protein (about 0.8 g per kg, 1.2 to 2 g per kg for training).
Is Whey protein safe?
Contains milk; may upset people with lactose intolerance. Check for added sugar and third-party testing.
Does Whey protein interact with medicines?
Can reduce absorption of levodopa, levothyroxine, quinolone and tetracycline antibiotics and bisphosphonates; separate by 2 hours.
Sources and further reading
Last reviewed 31 October 2026. Written by Satya Babu.
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