What is the best form of protein?
2 forms compared by what actually reaches your bloodstream. Absorption ranges from 85% to 95% — a difference that matters more than the milligrams on the label.
Ranked by absorption
Higher means more of the dose reaches youShort answer
Whey Protein absorbs best — 95%.
Muscle growth & recovery. Typical dose 25-75g, about $60 a month. The cheapest option is Casein Protein at $55, but its absorption score is only 85 of 100.
Every form side by side
| Form | Absorbed | Elemental | Cost / 100 mg delivered | Per month | Dose |
|---|---|---|---|---|---|
| Whey Protein | 95% | — | $0.00 | $60 | 25-75g |
| Casein Protein | 85% | — | $0.01 | $55 | 25-50g |
What not to take with protein
Same rules for every form — the interaction belongs to the mineral, not the carrierSeparating the two by two to four hours removes most of these: they compete for the same transporters in the gut, not in the bloodstream. Splitting the day is what solves a conflict — dropping one of the two is rarely necessary.
Medication interactions
High protein intake may reduce levodopa absorption · Separate protein intake from levodopa dosing by 2+ hours
Casein calcium content may reduce antibiotic absorption · Space antibiotic and casein intake by 2+ hours
Protein may reduce antibiotic absorption · Space antibiotic and protein intake by 1-2 hours
Prescription medicine is your doctor's call, not ours — this is what the records list.
How much is too much
401 reports to the FDA name protein as the suspect product.
Most reported: hypersensitivity (77), vomiting (74), nausea (67), diarrhoea (61). Serious outcomes: 78% of them.
Counted from FDA CAERS by parsing each report's product list, not by keyword — a report where the product was merely present does not count.
Head to head
How to read this
- Absorption is the share of the dose that reaches your bloodstream — the number that decides whether the milligrams on the label mean anything.
- A cheaper form at half the absorption is not cheaper per unit delivered.
- Safety here reflects tolerance at normal doses, not toxicity risk.
- Evidence A means the form itself was studied, not just the parent compound.
Compiled by Denis, who maintains this database and holds no medical qualification. Absorption figures and cost-per-absorbed values are derived by published formulas from cited sources — see the arithmetic.
Common questions
What is the best form of protein?
Whey Protein — it scores 95 of 100 on absorption, the highest of the 2 forms here. Muscle growth & recovery. Typical dose 25-75g.
Which form of protein is worst absorbed?
Casein Protein at 85%. It is usually the cheapest option, which is exactly why it ends up in budget products.
Is the expensive form of protein worth it?
Compare per unit delivered, not per bottle. Casein Protein costs $55 a month at 85% absorption, Whey Protein costs $60 at 95%.
How much protein should you take?
Doses differ by form: Whey Protein 25-75g; Casein Protein 25-50g.