Fourteen Days, One Sheet of Paper: The CBD Test That Settles the 'Is It Working?' Argument

There is a particular kind of CBD review that happens in British kitchens at about 9pm. You squeeze a few drops under your tongue, put the kettle on, sit down for the first time since 7am, and think: yeah, that's helping. Maybe it is. But right now you have no way of knowing whether it was the oil, the sofa, or simply the fact that nobody has asked you a question in twenty minutes.

That is not a criticism. It is just what happens when the only instrument you own is a feeling. So here is the fix, and it costs nothing: one sheet of paper, fourteen days, and a pen that lives next to the kettle.

Why paper wins over another app

You have enough apps. A CBD tracker app wants an account, a notification permission, a seven-day streak, and a rating. A sheet of A4 wants nothing. It sits on the kitchen table where you will trip over it, and it does not guilt-trip you if you miss a Tuesday.

The other advantage is honesty. Apps tend to ask you to rate your mood on a cartoon face. A paper grid asks for a number and a time, which is much harder to fudge when you are reviewing your own spending.

The sheet itself

One page, portrait, eight columns. Date, time taken, dose in milligrams, product and batch number, sleep score out of five, stress score out of five, spend, and a short notes column. Give yourself a final box at the bottom of each day for one sentence: what did I actually notice?

That last box matters more than the numbers. 'Fell asleep before the end of question time' is useful. 'Felt calm' is not.

Do the milligram maths once

This is where most people quietly give up. A 10ml bottle containing 1,000mg of CBD is 100mg per millilitre. A standard dropper is usually about 20 drops per ml — check your own bottle, because they vary — which works out at roughly 5mg per drop.

Write that number at the top of the sheet in permanent marker. Then you never have to think about it again. Every evening you record drops, and you convert to milligrams in one glance.

The four rules that make the fortnight mean something

First, change one thing at a time. Same product, same dose, same timing for fourteen days. If you double the dose on day nine because work went sideways, you have run two experiments and learned nothing from either.

Second, take it at a consistent clock time and write that time down. 'Evening' is not a time. 20:45 is a time.

Third, score sleep in the morning, for the night you have just had, before you have had a chance to rewrite history. Score stress at the same point in the day each time — say, straight after lunch.

Fourth, note the confounders. Two glasses of wine, a late train, a cold, an argument, a hotel pillow. Life moves these numbers as much as anything in a bottle does.

Week one versus week two

Treat the first week as a settling-in period. Your scores will be noisy and your routine will be clumsy. Week two is where you look for a comparison.

What you are hunting for is a shift that holds — not a single golden Wednesday. If your sleep score moves from a two to a three or four, and it stays there for five of the seven days in week two, that is worth writing down. If it spikes once after a bath and a 10pm lights-out, that is a bath and an early night.

What actually counts as a pattern

A pattern has three parts. It repeats across at least five days of week two. Your dose stayed flat rather than creeping upwards. And you can name the specific thing that changed — nodding off faster, fewer 3am wake-ups, less jaw-clenching on the Northern line — rather than a general sense of being a bit more chilled.

One more test: the cost per milligram did not quietly rise. More on that below.

What does not count

A brilliant night after a family dinner is not data. Neither is the classic 'I forgot to take it for three days and felt fine'. That is not a failure of the product; it is a result. It might mean you do not need it, or that you need less. Both are useful findings and neither one costs you money.

And be suspicious of the warm glow that comes from having spent £60. That is sunk cost, not science.

The spend column nobody wants to fill in

Price divided by total milligrams gives you cost per milligram. A 10ml bottle with 1,000mg at £40 works out at 4p per milligram. At 25mg a day, that is about £1 daily, or £30 a month.

Now look at your fortnight. If your scores are flat but your dose has climbed, and your cost per milligram is creeping upwards with it, that is your answer. It is not a stronger product you need. It is a stop, or a reset.

Keeping expectations honest

CBD is not a licensed medicine in the UK, and brands are not allowed to claim it treats anxiety, insomnia or anything else. The evidence base is genuinely limited, and a paper tracker does not change that. What it does is tell you whether your own experience is consistent or whether you have simply folded a bottle into your evening routine alongside the dishwasher and the doomscrolling.

If you take prescribed medication — particularly blood thinners, epilepsy medicines, or anything carrying a grapefruit warning — have a word with a pharmacist or GP before you start a fortnight-long experiment. And never stop prescribed medication to test a supplement.

The repeat purchase decision

Three outcomes, three sensible responses.

Clear pattern, manageable cost: buy the same strength again and keep the sheet going for another fortnight in the new year.

No pattern at all: do not re-order. Either stop, or drop the dose and retest. A no is a result.

Pattern, but the spend is climbing: try a higher-strength bottle so you use fewer drops for the same milligram dose, then retest. Higher strength is not about taking more. It is about paying less per milligram.

Stick it in a drawer

When the fourteen days are up, do not bin the page. Put it somewhere you will find it in February. Run the experiment again for a fortnight and compare the two sheets. That is how a vague habit becomes a personal record, and how a £40 bottle stops getting judged on a feeling at 9pm.

Fourteen days. One page. One pen that goes missing twice. That is the whole system.