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4Optional

Whey protein

Also sold as Whey, protein powder, casein

Convenience food, not a supplement — useful only if protein targets aren't met.

4TrustedSupp Tier System™ · Tier 4Take by choice, or not at all
Check before you startThis one has documented interactions with medication classes where the consequences are serious. If you take any prescription medicine, run it past a pharmacist before starting.

How long to take it

Use it whenever it's convenient. There is no course.

Who it's actually for

Anyone struggling to hit protein targets from food alone.

Safe upper limit

Unverified
Not applicable; a food
No limit beyond overall protein intake. Caution with significant kidney disease.
No source attached yet. Treat this as a starting point, not a citation, until reviewed.

Interactions to know about

  • Reduced kidney function — CKD, dialysis, or a single kidney
  • Antibiotics — Especially tetracyclines and quinolones

Other supplements:

Run your full list through the interaction check.

Practical notes

  • Isolate if lactose bothers you.
  • Third-party testing matters — heavy metal contamination has been found in some powders.