How Much CBD Do You Actually Need?

Milligrams, Not Millilitres

The single most common mistake is measuring by dropper instead of by dose. Two bottles of the same size can differ tenfold in strength, so "one dropper" means nothing on its own.

The number that matters is milligrams of CBD per day. To find it: divide the total milligrams on the bottle by the millilitres it contains, then multiply by how many millilitres you take and how often.

A 30 ml bottle labelled 1,500 mg holds 50 mg per millilitre. Half a dropper is roughly 25 mg. Write that number down — it is the only way to know whether a change in dose did anything.

Start Low, Go Slow — and Actually Wait

The standard approach is to begin at a low dose, hold it for several days, and increase gradually only if needed. It is not caution for its own sake. CBD effects at lower doses are often cumulative rather than immediate, and judging it after one evening tells you very little.

A reasonable pattern is to hold each dose for five to seven days before changing anything, and to change only one thing at a time. People who increase daily end up unable to tell what helped.

Why More Is Not Always Better

CBD does not behave in a straight line. Some research suggests a bell-shaped response, where a moderate dose outperforms both a small one and a large one for a given effect. It is one of the more counter-intuitive findings in the field, and it means overshooting can feel like failure.

If a higher dose works less well than a lower one did, that is informative rather than contradictory. Going back down is a legitimate adjustment.

Where the Legal Threshold Sits

In Costa Rica, a daily dose above 70 mg moves CBD into prescription territory. Many people working up from a low dose cross that line without realising it. Our guide on when CBD needs a prescription covers what that means and what to do about it.

Timing and Form Change the Answer

How you take it matters as much as how much.

• Under the tongue, held for 60 seconds — faster onset, and less is lost than when swallowed.
• Swallowed — slower, and a significant portion is metabolised before reaching the bloodstream, so the effective dose is lower than the label suggests.
• With food, especially fatty food — absorption increases substantially. The same dose taken with a meal is not the same dose taken fasted.
• Topical — acts locally; it does not deliver a systemic dose.

Our comparison of routes of administration goes into this in more detail.

When to Stop Adjusting and Ask

Three situations warrant a physician rather than another increase: if you are taking other medication, because CBD affects the enzymes that process many common drugs; if you have passed 70 mg a day; or if you have worked up methodically and still have no effect, which usually means the dose, the form or the expectation needs examining rather than simply raising.