Multivitamin powder vs capsule: a formulator's verdict after 10 years

The question comes up regularly: "Why is base One a powder and not a capsule, isn't that less convenient?" The short answer: I chose powder because it is the only way to give the body everything it needs in a single action.

The mechanical limit of the capsule

A size 0 capsule, the standard format for multivitamins, holds about 500 mg of powder.

To reach the functional doses of the 29 selected nutrients, we arrive at 6 grams of active material per day, the equivalent of 12 capsules. Brands are then forced into a choice: cut the number of capsules by compressing the doses until they become clinically ineffective, or keep 4 to 6 capsules and accept a collapse in adherence.

This is what is called "cosmetic underdosing": a formula that lists an ingredient at a dose too low to produce a measurable effect. The label claim is real; the physiological effect is not.

What powder makes possible

A 6 g dose dissolved in 3 dl of water contains the equivalent of 12 capsules in active material. This opens up several possibilities that are structurally out of reach for a tablet or capsule format.

• Clinically relevant doses across all compounds: 580 mg of vitamin C and 100 mg of magnesium citrate in a single daily dose are impossible to condense into one or two capsules.
• The inclusion of amino acids: glycine (750 mg) and L-glutamine (1,500 mg) alone take up most of the volume; for this reason they are almost systematically absent from capsule formulas.
• Better dispersion in the digestive tract: dissolved powder offers a far larger contact surface with the intestinal mucosa than a tablet or capsule in the process of disintegrating.

An often-overlooked benefit: cellular hydration

Dissolving base One in a glass of water is not just a galenic constraint. It is a physiologically coherent act: nutrient intake and cellular hydration happen at the same time.

The electrolytes in the formula (potassium citrate at 300 mg, magnesium citrate at 100 mg) contribute directly to maintaining the cell membrane potential. The Na⁺/K⁺-ATPase pump, which consumes between 25 and 40% of cellular ATP at rest, depends on the constant availability of these two cations to maintain the transmembrane electrochemical gradient. A concurrent supply of water and bioavailable electrolytes is therefore a functional optimisation, not a mere convenience.

Optimising mineral absorption: taken with or just before a meal, the reconstituted solution improves the absorption of dietary minerals. Vitamin C (580 mg) increases the absorption of non-heme iron two- to fourfold. The citric acid in the formula keeps divalent cations in solution within the food bolus, delaying their precipitation into insoluble salts.

When the capsule remains relevant

The capsule keeps its legitimacy in several configurations.

• Single-ingredient supplements: a lipid-based vitamin D3, omega 3, an isolated adaptogen; here the capsule is the logical format.
• Fat-soluble ingredients: omega-3, vitamin D3 and vitamin K2 (MK-7) require a lipid carrier to be absorbed correctly; here the oil capsule or softgel is irreplaceable.
• Strong-tasting plant extracts: some plants are more comfortable in a capsule for organoleptic reasons.

The "1 capsule a day" trap

Many brands promote the single daily capsule as the epitome of convenience. Biochemically, this is almost always an admission of underdosing. A complete, effective multi-nutrient formula structurally cannot fit into 500 mg.

The relevant criterion is not the format: it is the amount of genuinely bioavailable active material per daily dose. Before any purchase, three simple questions: how many milligrams of elemental magnesium in the daily dose? In what form is the B12? At what dose of 5-MTHF? If the answers fall in tens of micrograms or fractions of a milligram for nutrients whose effects are documented in hundreds, the formula is structurally insufficient, whatever the quality of its packaging.

Ten years of formulation: what I take from it

Having formulated both formats, my conclusion is unambiguous: for a complete daily micronutrient base, powder dissolved in water is the only format that delivers on what the label promises. Seemingly less convenient; more coherent biochemically, galenically and physiologically.

If powder remains incompatible with your daily life, choose a capsule formula with open eyes: it will likely be more concentrated in water-soluble vitamins (group B, C), which can be dosed more densely, and probably free of amino acids and bioavailable minerals at useful doses. It is not a bad choice; it is a conscious one, with its limits.