Capsules, tablets, powder or drops: what the form actually decides

If you searched for "capsules or powder" or "which form absorbs better", you have probably landed on pages that answer confidently. This one will not, and that is not caution — the answer depends on the substance, the dose and the person, and none of those three is visible in the word "capsule".

So it is split in two: what the form genuinely decides and can be checked on the label, and what gets claimed about it but cannot. The first is arithmetic. The second is where most advertising lives.

What the form actually decides

Three things, all three readable off the pack:

• How much substance fits in one dose. A size "0" capsule holds roughly 400–500 mg of powder. If the daily dose is 3 g, that is six to eight capsules — or one scoop.
• What else goes in, besides the active ingredient. To hold its shape and survive the pack, a tablet needs binders, fillers and often a coating. A capsule needs fewer of these additives; powder needs the fewest.
• Whether the dose can be split. Powder and a scored tablet can; a capsule cannot, short of opening it.

Everything else said about forms is either a consequence of those three, or a claim the label does not support.

Capsules

A gelatin or plant-based (HPMC) shell around powder. Dissolves in the stomach within minutes.

Practically: it hides taste completely, needs few excipients, and the dose is fixed. The limit is volume — past roughly 500 mg per capsule it gets unwieldy, and substances dosed in grams become a lot of capsules.

Our products are capsules. The reason is the first one: the formulas combine a dozen or so ingredients, several with a pronounced taste, and dosing a blend accurately is more reliable in a capsule than in a scoop.

Tablets

Compressed powder. Fits more substance into less volume than a capsule, which is its real advantage.

The cost is in the excipients: to compress and to survive the pack without crumbling, a tablet carries binders, glidants and sometimes a coating. They are listed on the label — that is the place to look if you care what else you are swallowing.

A scored tablet is the only form where you can halve the dose without opening anything.

Powder

Fewest additives and cheapest per gram. It makes sense for substances with high doses, where capsules would be many.

The two limitations are real and get underrated: taste and dosing. A scoop is approximate — the same scoop holds different amounts depending on how packed the powder is. If dose accuracy matters, a kitchen scale is the difference.

Liquids and drops

Convenient for children and for anyone who does not swallow capsules. Dosed with a pipette or spoon.

The two things that get skipped: liquids usually contain preservatives, because a water-based medium requires them, and many have a shorter shelf life once opened. Both are on the label.

Gummies

The fastest-growing form, and the one whose label deserves the closest reading.

The gummy base needs sugar or a sweetener, and the gelatin or pectin takes up volume — which means less room for the substance itself. The dose per gummy is often lower than you would expect, and two gummies a day at 3 g of sugar each is 6 g of sugar a day, every day.

We are not saying they are bad. We are saying the comparison with a capsule has to include the sugar column, and usually does not.

Under the tongue

Sublingual forms are sold on the idea that the substance passes straight into the blood, bypassing digestion.

For some substances this is established. For most of what is sold this way it is not — the molecule has to be small and lipophilic enough to cross the mucosa, and most vitamins and plant extracts are not. The form by itself does nothing; the molecule decides.

Same ingredient, different salt

This is the one place in this article where the difference is pure arithmetic and can be checked before buying anything.

Minerals are not sold in elemental form. Magnesium is bound to something — oxide, citrate, glycinate — and that something has weight. The label usually declares the weight of the whole compound, and the amount of mineral in it is a percentage of that:

• magnesium oxide — about 60% magnesium
• magnesium citrate — about 16%
• magnesium bisglycinate — about 11%

So 500 mg of oxide gives about 300 mg of magnesium, and 500 mg of bisglycinate about 55 mg. A fivefold difference behind the same number on the front of the pack.

Which is why the number worth looking for is not the milligrams of the compound but the NRV percentage — that has already been worked out for you (our own magnesium figures), and it is the only figure that compares between two packs.

Whether one salt is better absorbed than another is a separate question, and it is not settled the way advertising presents it. Studies compare particular salts, at particular doses, in particular people, and they disagree. So this page stops here: the arithmetic is certain, the rest is not. If you want to judge such a study yourself, the eight questions are a page of their own.

What this page does not say

It does not say which form is "best". There is no such answer — there is a form suited to a particular substance, dose and person.

It does not claim that any form absorbs better than another. That would be a claim about a food with no authorisation under Regulation (EC) 1924/2006, and the evidence is not one-sided either.

Food supplements do not treat or prevent disease, and they complement rather than replace a varied diet. Do not exceed the recommended daily intake. If you are pregnant, breastfeeding, taking medication or have a medical condition, consult a doctor before use.