Updated October 1, 2026 · ThriveCue Editorial Team
Diamond CBD vs Protein Works
Where Diamond CBD and Protein Works differ
| Compare |  Diamond CBD |  Protein Works |
|---|---|---|
| Third-party tested | YesHas it | No |
| Subscription discount | 40%Higher | 15% |
| Money-back period | 100 days | 180 daysHigher |
| Markets | US | GB, IE, FR |
| Price from | Not confirmed | £8.99 |
| Price per serving | Not confirmed | £0.15 |
| Certifications | Organic | Not confirmed |
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Key differences
- Third-party tested: only Diamond CBD.
- Subscription discount is higher at Diamond CBD: 40% vs 15%.
- Money-back period is higher at Protein Works: 180 days vs 100 days.
- Protein Works is available in 2 more countries.
- Products: only Protein Works offers Multivitamins, Vitamins minerals, Omega 3.
- Markets: only Diamond CBD offers US.
- Markets: only Protein Works offers GB, IE, FR.
Our verdict on each
Diamond CBD
Diamond CBD suits US shoppers who want a sleep and stress line with third-party testing and a long money-back window. A subscription order takes 40% off the price, so a routine buys well; the limit is that orders ship to US only.
Protein Works
Protein Works suits shoppers who want a wide range of daily supplement categories at a low entry price, with £8.99 to start. Buyers who put independent lab testing at the top of their list should look further, since third-party testing is not offered.
Score breakdown
| Area | Diamond CBD | Protein Works |
|---|---|---|
| Cost | Not confirmed | 9.8Entry pricing of £8.99 and £0.15 per serving sit at 15 of 121 brands. |
| Offer | 9.7HigherSubscription discount of 40% and a 100 days money-back window carry the value, on a sleep and stress plus nootropics range. | 9.2Range covers multivitamins, vitamins minerals and omega 3, with 15% off subscriptions and 180 days for returns. |
| Trust | 8.8Third-party testing is a stated yes and the certification listed is organic, while the company is First Capital Venture registered in US. | 8.9HigherThird-party testing is not offered, though email, chat and phone and 2013 add some confidence. |
Positions in our rankings
| Ranking | Diamond CBD | Protein Works |
|---|---|---|
| Sleep and stress supplements | 12 of 155 | 14 of 155 |
A third option
FAB CBD has subscription discount at 33.6% to 82.6%, against 40% for Diamond CBD and 15% for Protein Works.
FAB CBD reviewWhat we checked
Diamond CBD
- diamondcbd.com: 9 facts, checked September 30, 2026
Protein Works
- theproteinworks.com: 12 facts, checked September 30, 2026
Every fact side by side
| Fact | Diamond CBD | Protein Works |
|---|---|---|
| Products | Sleep stress, Nootropics | Multivitamins, Vitamins minerals, Omega 3, Probiotics, Greens, Collagen, Sleep stress, Nootropics, ElectrolytesCovers more |
| Diets | Not confirmed | Vegan, Vegetarian, Gluten free |
| Legal entity | First Capital Venture | Class Delta Limited |
| Headquarters | United States | United Kingdom |
| Founded | Not confirmed | 2013 |
| Support channels | Email, Chat, Phone, Help centre | Email, Chat, Phone, Help centre |
Sports nutrition
| Fact | Diamond CBD | Protein Works |
|---|---|---|
| Protein per serving (g) | Not confirmed | 20 |
| Flavours (flavours) | Not confirmed | 8 |
Where each stands against the rest
| Fact | Diamond CBD | Protein Works | Median |
|---|---|---|---|
| Price from | Not confirmed | £8.99lowest quarter | £25 |
| Price per serving | Not confirmed | £0.15below the median | £0.83 |
| Subscription discount | 40%highest quarter | 15%at the median | 15% |
| Money-back period | 100 dayshighest quarter | 180 dayshighest quarter | 30 days |
Median across 167 listed brands.
Pros and cons
Diamond CBD
Pros
- Third-party testing is a stated yes, so the lab claim on the products is easy to weigh before buying.
- Subscription orders come in at 40% off, the cheapest way to keep a routine running.
- The money-back window of 100 days gives slow decisions plenty of room.
Cons
- Orders ship to US only, so the 40% subscription saving is worth nothing to anyone outside that market.
- The catalogue is sleep stress and nootropics, a much tighter range than DocMorris, which lists multivitamins, vitamins minerals and omega 3.
- The only certification listed is organic, leaving shoppers who weigh a named testing programme with a thin basis.
Protein Works
Pros
- Covers a wide list of categories in multivitamins, vitamins minerals and omega 3, from multivitamins to electrolytes.
- Entry point of £8.99 with a per serving cost of £0.15, ranked 15 of 121 brands on price per serving.
- The range suits different diets, with vegan, vegetarian and gluten free options on the multivitamin formula.
Cons
- Delivery covers GB, IE and FR, which is a narrower set of markets than some pharmacy-led rivals.
- The range carries 8 flavours on its whey protein line, but the entry pricing and per serving cost come from the multivitamin product.
- The £8.99 entry price ranks 23 of 157 brands, so the price on the front of the pack sits mid-table.
Who each suits
Diamond CBD
Who it suits
- US shoppers focused on sleep and stress who want third-party testing and a long trial window.
- People happy to order by subscription to take 40% off repeat purchases.
- Shoppers who want a focus product in the same basket, since sleep stress and nootropics covers sleep, stress and nootropics.
Who should look elsewhere
- Anyone who wants a broad catalogue: Diamond CBD covers sleep stress and nootropics, while DocMorris lists multivitamins, vitamins minerals and omega 3.
- Buyers after probiotics, collagen, omega-3 or vitamins and minerals, which Life Extension lists in multivitamins, vitamins minerals and omega 3 and sit outside sleep stress and nootropics.
- Shoppers living outside US, where the brand does not ship.
Protein Works
Who it suits
- Shoppers who want vitamins, probiotics, greens, collagen, sleep and stress, nootropics and electrolytes from one brand.
- People on vegan, vegetarian and gluten-free diets, covered by vegan, vegetarian and gluten free.
- Buyers in the United Kingdom, IE and FR who value a low per serving cost of £0.15.
Who should look elsewhere
- Buyers who need third-party tested products, since DocMorris and other pharmacy brands list independent testing in this category.
- Anyone outside GB, IE and FR, where the GB, IE and FR delivery list does not reach.
- People who want licensed or prescription oversight, as no licence appears against this brand.
Current offers
Diamond CBD
Current offer
Discount code
40% off first purchase coupon on signup: 40% off first purchase
One time coupon emailed on registration; first purchase only
Source, checked September 30, 2026
Country by country
| Country | Diamond CBD | Protein Works |
|---|---|---|
| France | No | Yes |
| Ireland | No | Yes |
| United Kingdom | No | Yes |
| United States | Yes | No |
Questions about each
Diamond CBD
What does the subscription discount do to the price?+
Subscription orders are marked at 40% off, and that saving attaches to the subscription rather than to a single buy. Pair it with the 100 days money-back window and a cautious trial is easier to justify. Serving cost still moves with the size of the format you pick, so compare the listed serving figures before settling.
Is there a long return window if a product misses the mark?+
The money-back guarantee runs 100 days, long enough to judge a sleep or stress formula over repeated use rather than a single night. Requests go to the same team, reachable on email, chat and phone. Together they make a slow decision low risk, as long as you keep the terms attached to your order.
Protein Works
How much does Protein Works cost to start?+
The entry price is £8.99 for the multivitamin product. The same product works out at £0.15 per serving, so a larger pack lowers the cost per serving. The per serving figure ranks 15 of 121 brands in this category.
Is there a discount for ordering repeatedly?+
Yes, subscriptions carry a 15% discount against the entry price of £8.99. The discount applies to repeat orders rather than the first purchase, so it only shows on the ongoing cost. Orders placed on a subscription continue until you change them.
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