Tablet dosing depends on what you're making and what you're putting inside

The amount of medication or active ingredient that goes into a tablet is called the dose, and it varies wildly depending on what the tablet contains. A vitamin C tablet might hold 500 milligrams, while a blood pressure tablet might hold 5 milligrams. If you're making tablets at home—whether herbal, supplement, or medicinal—the dose you use depends on three things: what substance you're working with, how potent it is, and what the intended use is.

Home tablet-making is most common with herbal powders, dried plant material, and nutritional supplements rather than pharmaceutical drugs. The process usually involves mixing a powder with a binder, pressing it into a tablet mold, and letting it dry. The weight of the finished tablet tells you how much active ingredient is inside, but only if you know the concentration of your starting powder.

If you're working with a substance for the first time, you need to know its recommended dose before you start measuring anything. That information comes from the supplier, a reference book on herbal medicine, or—for over-the-counter supplements—the label on a commercial version of the same product.

Key Takeaways

  • The dose in a tablet is measured in milligrams or grams and depends entirely on what substance is inside and what it's meant to do.
  • Most home tablet presses make tablets between 500 and 1000 milligrams total weight, but only a portion of that weight is the active ingredient—the rest is binder.
  • You calculate the dose by multiplying the concentration of your powder by the weight of powder you use in each tablet.
  • Common herbal tablet doses range from 300 to 1000 milligrams per tablet, but this varies by herb and by the form of the plant material you start with.
  • If you're unsure about a dose, start with what a commercial product contains and match that amount rather than guessing.

Understanding tablet weight versus active ingredient

A tablet's total weight is not the same as the dose. If you press a 750-milligram tablet, that 750 milligrams includes the active powder, the binder (usually microcrystalline cellulose or gum arabic), and any flow agents that help the powder move through the press. The active ingredient might be only 60 to 80 percent of that total weight.

For example, if you're making turmeric tablets and your turmeric powder is 100 percent pure turmeric, and you add 20 percent binder by weight, then a 750-milligram tablet contains roughly 600 milligrams of turmeric and 150 milligrams of binder. But if your starting powder is already a blend—say, turmeric extract mixed with filler—the actual curcumin (the active compound) might be much less.

This is why knowing your starting material matters. If you buy turmeric powder from a grocery store, it's pure turmeric. If you buy turmeric extract from a supplement supplier, it's concentrated, and you use much less of it per tablet. Always check what you're starting with before you measure.

How to calculate the dose for your tablets

Start with the dose you want in each tablet. Let's say you want 500 milligrams of dried herb per tablet. Weigh out 500 milligrams of your herb powder. Then add your binder—typically 15 to 25 percent of the herb weight, so 75 to 125 milligrams in this case. Mix them thoroughly.

Now you have a blend that's roughly 500 milligrams of active ingredient plus 100 milligrams of binder, for a total of 600 milligrams per tablet. When you press this mixture, each tablet will contain approximately 500 milligrams of the herb. If your tablet press makes tablets of different sizes, adjust the amount of mixture you load into each die to match your target weight.

The math is straightforward: (weight of active ingredient ÷ total tablet weight) × 100 = percentage of active ingredient. If you want to know how much active ingredient is in a tablet you've already made, weigh the tablet, then multiply its weight by the percentage of active ingredient in your blend.

Common tablet doses for herbs and supplements

Most commercial herbal tablets range from 300 to 1000 milligrams per tablet. Dried leaf material—like dried nettle, chamomile, or peppermint—is usually pressed into 500 to 750-milligram tablets because the powder is light and fluffy. Denser materials like dried roots or bark often make smaller tablets, around 400 to 600 milligrams, because they compress more tightly.

Extracts and concentrated powders require much smaller doses. A turmeric extract tablet might be only 100 to 300 milligrams because the active compounds are already concentrated. A ginger extract tablet might be 200 to 400 milligrams. Always check the label on a commercial version of what you're making—that's your reference point for what a standard dose looks like.

Vitamin and mineral tablets vary even more. A vitamin C tablet might be 500 to 1000 milligrams, while a zinc tablet might be 15 to 30 milligrams. A calcium tablet is often 500 to 1000 milligrams because calcium is heavy and bulky. If you're making supplement tablets, match the dose on the bottle of a commercial product in the same category.

Mistakes that change how much goes into each tablet

The most common error is not accounting for binder weight. If you measure 500 milligrams of herb and press it without binder, the tablets will crumble and fall apart. When you add binder, the total tablet weight goes up, but the active ingredient stays at 500 milligrams. Many people then assume the tablet contains 500 milligrams of active ingredient plus the binder weight, when actually the binder replaces some of the herb weight in the final tablet.

Another mistake is using inconsistent powder. If you grind your own herbs, the fineness of the grind affects how much powder you can fit into a tablet. Finely ground powder compresses more tightly than coarsely ground powder. If you switch from store-bought powder to home-ground powder, your tablet weights and doses will change. Stick with one source and one grind size until you're comfortable with the process.

Moisture content also matters. If your powder absorbs moisture from the air, it becomes heavier by weight but not by active ingredient. Store your powders in airtight containers and weigh them in a consistent environment. If you live in a humid climate, measure your powders in the morning before the air warms up and humidity rises.

Adjusting doses for different tablet sizes and presses

Tablet presses come in different sizes. A small manual press might make tablets of 400 to 600 milligrams, while a larger press can make tablets of 1000 milligrams or more. The size of the die (the cavity where the powder goes) determines the maximum weight of the tablet you can make.

If your press makes only small tablets and you want a larger dose, you have two options: make the tablets denser by adding less binder, or make tablets with a higher concentration of active ingredient. If you're using a 500-milligram die and want 600 milligrams of active ingredient per tablet, you can't fit it in without changing your binder ratio or using a concentrated extract instead of whole powder.

Some people solve this by making two-part tablets—pressing two smaller tablets and taking them together. This works fine as long as you're consistent and you label them clearly. Keep a record of your blend ratio and tablet weight so you can reproduce the same dose every time.

Reading labels to match commercial tablet doses

The easiest way to know if your dose is right is to compare it to a commercial product. Look at the Supplement Facts label on a bottle of the same herb or supplement. It will list the amount per serving in milligrams or grams. If a commercial turmeric tablet contains 500 milligrams per tablet, make your tablets contain 500 milligrams too.

Pay attention to whether the label lists the whole herb or an extract. "Turmeric root powder 500 mg" is different from "Turmeric extract (95% curcuminoids) 500 mg." The extract is much more potent, so you'd use far less of it. If the label doesn't specify, assume it's the whole dried plant material.

Some labels list the dose as a range—"300 to 600 mg per tablet"—because different batches of the plant material have different potency. This is normal. If you're making tablets for personal use, pick a dose within that range and stick with it.

Frequently Asked Questions

Can I put more active ingredient in a tablet if I use less binder?

Yes, but only to a point. Tablets need enough binder to hold together—usually at least 10 to 15 percent of the total weight. If you go below that, the tablets will crumble. You can experiment with your specific press and powder to find the minimum binder ratio, but don't eliminate it entirely.

What if my powder is already mixed with other ingredients?

Then you need to know the concentration of the active ingredient in that blend. If you buy a turmeric blend that's 50 percent turmeric and 50 percent filler, and you want 500 milligrams of turmeric per tablet, you need to use 1000 milligrams of the blend. Always ask the supplier what's in the powder before you use it.

How do I know if my tablet dose is too high or too low?

Compare it to commercial products and to any reference materials on the herb or supplement. If your dose is significantly higher or lower than what's sold in stores, double-check your math. If you're still unsure, start with a lower dose and increase it gradually rather than guessing at a high dose.

Does the size of the tablet affect how much active ingredient it contains?

Not directly—the weight does. A small, dense tablet can contain the same dose as a large, fluffy tablet if they weigh the same. What matters is the total weight of the tablet and the concentration of active ingredient in your blend, not the physical size.

Can I make tablets with different doses in the same batch?

Yes, if you weigh each one individually before pressing. But this is time-consuming and straightforward to mess up. It's simpler to make one blend and press all tablets the same way, so every tablet in the batch is identical.