You drink the glass. Then what? The journey from a scoop to your bloodstream is one of the most elegant processes in biology — and understanding it makes you a smarter reader of every label you'll ever meet.
Digestion begins in the mouth, but the real machinery is below. Your stomach is an acid bath with a purpose: unfolding. Proteins arrive as complex three-dimensional structures, and stomach acid unravels them so enzymes can reach the chains inside. This happens to every protein you eat — a steak, a lentil, a scoop of whey, a scoop of collagen. The body doesn't file proteins; it takes them apart for parts.
The small intestine is where everything crosses into your blood. Its wall is folded into millions of tiny projections, giving it an enormous surface area. Here, short peptides and free amino acids pass into the bloodstream, along with sugars, minerals and vitamins.
Two things worth knowing: water-soluble nutrients — vitamin C and the B family — cross into the blood directly, and the body keeps only what it can use soon. There's no vitamin C storage tank in your body, which is why it's a daily habit, not a weekly one. Fat-soluble nutrients — vitamins A, D, E and K — take a slower route, absorbed with dietary fat and stored in the body's tissues. That's why they belong with meals, and why more isn't automatically better.
Fibre reaches the large intestine completely intact — human digestion has no enzyme for it. That's not a failure, it's the point: bacteria in the large intestine ferment certain fibres, feeding themselves in the process.
Two practical notes: heat matters for some nutrients — vitamin C breaks down above roughly 70°C, which is why it's best kept out of very hot drinks. And form matters for texture, while dose matters for nutrition — what your body actually receives depends on what's in the serving, not how it dissolves.
