Is FLOW Nitric Oxide Booster (The20) worth it?
Worth a look (5.0/10). FLOW is more transparent than most ClickBank offers in one respect: it names real people, Susan and Tim Bratton, as the company behind it, along with a registered LLC address, rather than an invented doctor. The catch is the business model and the dose. The "free bottle" is a subscription entry point that bills $22.47 to $27.42 a month afterward, with the two figures disagreeing between the sales page and the actual checkout page we reached. The formula's main active ingredient is L-citrulline, backed by a real human erectile-function study the company itself cites, but that study used 1.5 grams of citrulline a day. FLOW's entire proprietary blend, of which citrulline is only one of four ingredients, totals 850 mg, so even a generous share of that blend falls well short of the studied dose.
What we liked
- Names real individuals (Susan and Tim Bratton) and a registered company address instead of an anonymous or invented doctor
- Ingredient list is fully disclosed with no unnamed "other" ingredients
- Cites a real, checkable human trial on its main ingredient, L-citrulline, for erectile function
- Low-cost way to sample the product for $4.95 in shipping before any subscription charge
What we didn't
- Built around an auto-renewing subscription that starts from a "free" trial bottle
- Monthly subscription price is stated differently on the sales page ($22.47) versus the actual checkout page ($27.42)
- The 850 mg total blend is well under the 1.5 g citrulline dose used in the company's own cited study
- A penile-volume claim in the FAQ has no study cited to support it
- Individual amounts of vitamin C and pine bark extract in the blend are not disclosed
What is FLOW Nitric Oxide Booster (The20)?
FLOW is a capsule supplement marketed as a nitric oxide booster for circulation, energy and sexual response in both men and women, sold as a subscription: the first bottle is offered free (customer pays only shipping), then the order continues as an automatic monthly shipment and charge unless canceled.
The label lists one proprietary blend at 850 mg per 2-capsule serving: L-citrulline from fermented organic watermelon rind, fermented organic spinach, organic acerola cherry (a source of vitamin C) and pine bark extract (pinus pinaster). No individual ingredient amount is given within that 850 mg total. The company, The 20, LLC, is fronted by named individuals, Susan Bratton (described as the formulator) and her husband Tim, rather than an anonymous or invented doctor.
It is sold through ClickBank, which appears on the buyer's card statement (as "CLKBANK*free1flow" per the checkout page) and manages the subscription billing and refunds.
Format: Capsule, 2 per day, 60 capsules per bottle, 30-day supply per bottle, free-trial-to-subscription model. Sold by: The 20, LLC (sold through ClickBank).
What is on the FLOW Nitric Oxide Booster (The20) label?
Each row compares what the label or sales page states with what published research used. When an amount is missing, there is nothing to compare, and we say so.
The label discloses all four ingredients openly rather than adding unnamed "other" compounds, which is a genuine plus, but combining them into one 850 mg blend means the ingredient most supported by human research, L-citrulline, cannot reach the 1.5 g dose used in the trial the company itself cites.
Do the FLOW Nitric Oxide Booster (The20) claims hold up?
"Citrulline is found to be more effective at increasing NO synthesis" than arginine, with a cited reference
This is a reasonable summary of the citrulline-versus-arginine pharmacokinetics literature, but it describes the ingredient in general, not the 850 mg FLOW blend specifically, and does not establish that FLOW's amount is sufficient.
"Subscribe @ $22.47/Month & Save 25%" (stated on the sales page graphic)
The actual ClickBank checkout page we reached for the same offer states a future monthly payment of $27.42, about $5 higher than the sales page figure. The two pages do not agree on the real subscription price.
"Susan formulates it herself, takes it herself"
This is a personal claim about the company's founder that we cannot independently verify from the sales page alone, though naming a real person and a real company address is more transparent than an anonymous formula.
"If you want to increase your penis size, taking FLOW daily... will increase your overall penile volume"
No study is cited for a size or volume change from this product. This reads as an enhancement claim beyond what the circulation research on citrulline supports.
How much does FLOW Nitric Oxide Booster (The20) really cost?
| Option | Total | Per month | Shipping |
|---|---|---|---|
| 1 bottle, free trial (pay shipping only) | $4.95 | $4.95 | Shipping charged at checkout; bottle itself is free |
| Add 1 bottle at 50% off plus 1 free bottle (checkout upsell) | $14.97 | $7.49 | Shipping charged at checkout |
The offer is a free bottle for a $4.95 shipping charge, a 30-day supply at the labeled 2-capsules-a-day dose. The sales page states the subscription then continues at $22.47 a month, while the actual ClickBank checkout page for the same offer states $27.42 a month; expect somewhere in that range once the free trial ends, and check your own checkout screen carefully before confirming.
The checkout page also offers a one-time upsell: add 1 bottle at 50% off plus get 1 more bottle free for $14.97 in shipping, which would cover roughly 2 more months of supply on top of the trial bottle.
Our ClickBank checkout displayed all figures in USD from our test location (no BRL conversion issue on this particular order form); the $4.95, $14.97 and $27.42 amounts above are exactly what the checkout page showed us.
The first bottle is advertised as free with a $4.95 shipping charge. Taking the checkout upsell adds 2 more bottles (1 discounted, 1 free) for $14.97 in shipping. After the trial, the order automatically continues as a monthly subscription unless canceled.
Can you get a refund on FLOW Nitric Oxide Booster (The20)?
180-day window. The ClickBank checkout page states ClickBank's standard guarantee: return or replacement within 180 days of purchase. The seller's own sales page separately promises a 364-day return window on "the unused portion," which is more generous than what the checkout page itself states, so confirm which applies before relying on it.
Step by step: find the ClickBank receipt email, look up the order at clkbank.com and ask for a refund in writing. Our ClickBank refund guide covers returns, extra offers and auto-ship.
Which red flags did we find?
- Free trial converts to auto-billed subscriptionThe $4.95 "free bottle" is the entry point to a recurring monthly charge that continues until the customer cancels.
- Subscription price disagrees between pagesThe sales page advertises $22.47 a month; the actual ClickBank checkout page shows $27.42 a month for the same subscription.
- Citrulline dose likely well under the cited studyThe company's own referenced trial used 1.5 g of citrulline daily; FLOW's entire 4-ingredient blend totals 850 mg.
- Penis-size claim without a cited studyThe FAQ suggests daily use plus a vacuum device will "increase your overall penile volume," with no study cited for that specific outcome.
Who should buy FLOW Nitric Oxide Booster (The20), and who should skip it?
It may suit you if
- You want to try a citrulline-based circulation supplement from a company that names real people and a real address rather than an anonymous or invented doctor.
- You are organized about canceling subscriptions and want to try one free bottle while tracking the billing date closely.
Skip it if
- You dislike subscription/continuity billing or have been caught by forgotten free-trial charges before; this offer is built around that model.
- You want a citrulline dose close to the 1.5 g used in human erectile-function research; FLOW's whole blend is little more than half that amount.
- You take blood pressure medication; the page itself flags that citrulline and nitric oxide support can interact with blood pressure drugs and advises checking with a doctor first.
How we assessed this
We did not buy or use FLOW Nitric Oxide Booster (The20). This review audits the offer as it appeared on September 28, 2026. We read:
- The FLOW sales page (the20.store/flow-subscription-solo, reached through our ClickBank link), including its FAQ and reference list
- The actual ClickBank checkout page for the same offer (orders.clickbank.net), including the trial price, upsell offer and stated monthly subscription amount
- The product's own Supplement Facts label image hosted on the20store.com
- Cormio et al. 2011, the L-citrulline erectile-function trial the sales page itself cites, opened on PubMed
Sources
- Cormio et al. 2011, oral L-citrulline supplementation and erection hardness (PubMed)
- ClickBank customer support (orders and refunds)
Scores: evidence 3.5, price 4, refund 7.5, transparency 5. How we score.
Want a second opinion?
Worthorpass reviews the same offer from the checkout side: the real price on the order form, billing terms and delivery. Read the Worthorpass offer review of FLOW Nitric Oxide Booster Subscription and compare it with our dose and price audit above.
FLOW Nitric Oxide Booster (The20) FAQ
Is the FLOW free bottle offer legit?
It is a real product from a named company, The 20, LLC, sold through ClickBank. The free bottle is genuinely $4.95 in shipping, but it enrolls you in a recurring monthly subscription afterward, and the stated monthly price differs between the sales page ($22.47) and the checkout page we reached ($27.42), so read your own checkout screen carefully.
How much does FLOW cost after the free trial?
The sales page advertises $22.47 a month; the ClickBank checkout page for the same offer showed $27.42 a month. Expect a charge in that range once the trial period ends, and cancel before then if you do not want to continue.
What is in FLOW?
One 850 mg proprietary blend per 2-capsule serving: L-citrulline from fermented organic watermelon rind and spinach, organic acerola cherry (vitamin C) and pine bark extract (pinus pinaster), with no individual amount given for any of the four.
How do I cancel or get a refund for FLOW?
The ClickBank checkout page states a 180-day return or replacement guarantee, ClickBank's standard policy. The seller's own sales page separately claims a 364-day return window; contact ClickBank support through clkbank.com or call the number on your receipt to cancel the subscription and request a refund.
Does FLOW work for erectile dysfunction?
FLOW's main active ingredient, L-citrulline, has real support from a small human trial for mild erectile dysfunction, but that trial used 1.5 g of citrulline a day. FLOW's entire ingredient blend is 850 mg total, so the amount of citrulline you actually get is likely well below the studied dose.
