Delta-8, THCA and HHC Reviews Are Mostly Wrong: What to Check Instead

Hemp-derived cannabinoids — delta-8 THC, THCA, HHC, THCP, delta-10 — have produced a flood of reviews that read almost identically: strong, legal, lab-tested, buy now.

Some of those products are what they say they are. Some contain none of what the label claims. From outside the packaging, reviews rarely help you tell the difference. Here is what does.

First, what the compounds are

• Delta-9 THC is the psychoactive cannabinoid in cannabis, and the one the law treats most seriously.
• THCA is the acid form found in fresh cannabis. It is not psychoactive until heated, when it converts to delta-9 THC. Hemp sold as THCA flower is, functionally, cannabis with a legal argument attached.
• Delta-8 THC is a close relative of delta-9, less potent per milligram, and usually made by converting CBD in a lab.
• HHC (hexahydrocannabinol) is another semi-synthetic relative, sold widely since 2022.
• THCP and THCH are newer still; the research on them is minimal.

We covered the chemistry in more detail in what THCA actually is, THCP explained and delta-8 dabs.

The legal picture is not "legal"

The 2018 US Farm Bill legalised hemp and hemp derivatives containing no more than 0.3% delta-9 THC by dry weight. Sellers have read that as permission to sell delta-8, THCA and HHC nationwide.

Regulators and courts have disagreed in many places. A number of US states have banned delta-8 specifically; some have restricted THCA; the FDA has said delta-8 products are not lawfully marketed as dietary supplements. Enforcement varies enormously between states and shifts month to month.

So a review saying "legal in all 50 states" is a red flag, not a reassurance. Check your own state's rules — and if you are outside the US, check whether any of this is legal where you are, because in many countries none of it is.

What to check before you buy

1. A batch-specific certificate of analysis. Not a screenshot of a test from 2022, and not a "certificate of analysis" that shows only cannabinoid content. You want: cannabinoids and residual solvents and heavy metals and microbials, with a batch number that matches the package and a recent test date.

2. The delta-9 figure. Hemp-derived products are supposed to stay under 0.3% delta-9 THC. A product that exceeds it is being sold on a legal technicality at best.

3. How it was made. Delta-8 is usually synthesised from CBD using acids or solvents. Reputable producers publish the process and the purification steps; a one-line "premium quality" claim is not that.

4. Actual potency per serving. A gummy labelled "25 mg" may contain anywhere from 15 to 40 mg in practice — independent testing of delta-8 products has repeatedly found large discrepancies between label and contents. Small servings are safer than large ones, and a product that will not tell you its per-piece dose is not worth buying.

5. What the reviews are actually reviewing. "Great buzz, fast shipping" tells you nothing about potency accuracy or purity. Look for reviewers who name the batch and the test result.

What we will not do

We do not publish reviews of products we have not tested, and we do not rank hemp-derived products by potency. A directory that scores brands on strength is selling the thing it claims to measure.

What we do is keep a factual record of real businesses: brands and CBD and hemp retail listings are built from each company's own website, including what it says it sells and where it ships.

If you are weighing up this category against ordinary cannabis, flower vs concentrates explains the strength gap, and how much to buy covers sensible quantities and dosing.

The short version

• Assume the label is a claim, not a fact, until a recent batch-specific lab test says otherwise.
• Check the law where you are; "federal legal" is not the same as "legal here".
• Buy the smallest dose available, especially for edibles.
• Distrust any review that leads with potency and never mentions testing.

General information, not medical advice. Hemp-derived cannabinoid products are regulated differently from state-licensed cannabis, and the rules differ by country and state.