CBD moon rock: three layers and a percentage to check

A moon rock (also spelled "moonrock") is an assembled product, not a strain. You start with a dried hemp bud, coat it with a concentrated CBD extract, then roll it in kief. The name describes the result: a grey, powdery ball that looks like a lunar pebble.

In French shops, the kief layer is sold as "pollen", which is confusing. It is not botanical pollen from male flowers but the powder obtained by sifting trichomes, the resin glands that cover the flower. Professionals call it dry sift or kief. Our guide to CBD pollen covers how it is made and graded.

The middle layer can be a distillate or a dissolved isolate. An isolate normally contains 99% CBD or more, as our article on CBD isolate explains. That layer is what pushes the percentage up.

A moon rock's percentage is a weighted average. You add up the milligrams of CBD each layer brings, then divide by the total mass. Take a flower at 10% CBD, an extract at 85% and kief at 25%, three plausible values chosen for the example.

With 1 g of flower, 0.3 g of extract and 0.2 g of kief, you get 1.5 g of product holding 405 mg of CBD, or 27%. That is already nearly three times the starting flower.

To claim 60% with the same flower and kief, you would need about 2.3 g of extract per gram of flower. The coating would then weigh more than twice the bud it covers. Hence a simple rule: above 50% CBD, a moon rock is mostly extract. That is not a flaw in itself, but it changes the nature of the product, and so the question to ask about where that extract comes from and how pure it is.

The calculation also works the other way. A moon rock labelled 10% either has a very light coating or is closer to a flower than to a moon rock.

Not always, and public data show it. In 2017, a study in JAMA had 84 CBD extracts sold online in the United States tested, from 31 brands. With a 10% tolerance, only 30.95% were accurately labelled. 42.85% contained less CBD than stated, 26.19% more, and THC was detected in 18 of them.

France is no exception. In a warning dated 19 June 2025, the ANSM, the French medicines agency, reports that a 2023 survey by the addiction-monitoring centres of Lyon, Paris and Montpellier found a CBD content different from the label on 8 products out of 10.

With a moon rock, these gaps add up: three materials, three origins, three margins of error. Only a certificate of analysis for the batch on sale can settle it. Our guide to reading a certificate of analysis shows the lines to check, and our laboratory page describes the measurement methods.

A moon rock follows the rules for hemp flowers. The Conseil d'État annulled on 29 December 2022 the ban on selling raw flowers and leaves, and the order of 30 December 2021 sets the ceiling: 0.3% Δ⁹-THC for the varieties, for "hemp extracts" and for "the products that incorporate them".

That last point matters for a moon rock. The coating extract is itself a hemp extract, so the threshold applies to it. A full-spectrum extract concentrates THC along with CBD: if it goes above 0.3%, the product falls outside the law, even if the starting flower complied. Our article on the legal THC limit explains the measurement.

A moon rock is not a food. It is therefore not covered by the French Agriculture Ministry notice of 20 May 2026, which states that foods containing CBD are not authorised. Driving rules still apply: THC detected at the wheel is an offence, whatever the dose.

The main risk with a moon rock is not its CBD percentage but what the coating can hide. The ANSM reports poisonings linked to products sold as CBD that contained HHC, H4CBD or MDMB-PINACA, all classified as narcotics. A layer of extract and powder is a convenient carrier for such additives, which the eye cannot see. Our article on H4CBD explains how it ended up in products sold as CBD.

Before you buy, check four points on the certificate:

1. The batch number matches the one on the pouch.
2. Δ⁹-THC stays at or below 0.3%.
3. The measured CBD percentage fits the calculation: above 50%, extract dominates.
4. The lab looked for HHC, H4CBD and synthetic cannabinoids, and did not find them.

An effect that feels like cannabis should also raise a flag: CBD has no psychoactive effect. You will find our Moonrock among our other CBD flowers.