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Out of everything in Skinny Mixes’ catalog, one bottle has more reviews than almost anything else the brand sells: the Sugar Free Mermaid Syrup, at $8.99 with a 4.8 out of 5 rating across 1,975 reviews. The brand says it has sold out eight separate times since the WaterTok trend picked it up on TikTok. I went through a large chunk of those reviews and the actual ingredient label to see if the hype holds up.
What it’s made of
The flavor profile is coconut, pineapple, and citrus, marketed as a “tropical” and “magical” combination. The full ingredient list: water, citric acid, natural and artificial flavors, sucralose, acesulfame potassium, xanthan gum, sodium benzoate and potassium sorbate as preservatives, and FD&C Yellow No. 5 and Blue No. 1 for color.
Each bottle is 750ml (25.4 fl oz) with 25 servings, and it lands at zero calories, zero sugar, and zero carbs per serving. It’s also gluten-free, kosher, and made in the USA, with no aspartame in the formula.
What buyers are actually saying
A 4.8 average across 1,975 reviews with a 94% recommend rate is a strong number at that volume. Reviewers consistently describe it as tasting like a piña colada, with the coconut coming through stronger than the pineapple in most mixes.
One customer wrote that there was “nothing I have mixed this syrup in that did not taste amazing,” and another said it made their water taste like “drinking a piña colada.” The most common complaint is the opposite of what you’d expect: some reviewers find it too sweet or want a stronger flavor punch, rather than complaining it’s weak or artificial-tasting.
How to use it
Most reviewers use it in plain or sparkling water for a WaterTok-style flavored drink, but it works in cocktails too, especially rum-based ones where a piña colada flavor already makes sense. It’s not a coffee syrup in the way the brand’s vanilla or caramel flavors are. Coconut and pineapple don’t pair as naturally with coffee.
Start with less than the label suggests if you’re mixing it into water rather than a heavier drink. Because it uses sucralose and acesulfame potassium rather than the brand’s natural sweetener line, oversweetening is the most common way this bottle disappoints a first-time buyer.
How it compares
Against Skinny Mixes’ own lineup, Mermaid Syrup has more total reviews than any other flavor, though Sugar Free Salted Caramel and Sugar Free Vanilla edge it slightly on average rating. Against a coffee-shop staple like Torani, there’s no direct flavor match. Torani doesn’t sell an equivalent tropical blend, which is part of why this specific bottle built its own following. I laid out the broader brand comparison in Skinny Mixes vs Torani.
Should you buy it
If you want a flavored-water syrup with a real track record behind the viral moment, this is the easiest pick in Skinny Mixes’ catalog to justify. Start with a light pour, adjust to taste, and skip it if you’re specifically avoiding sucralose since the natural-sweetener line doesn’t include this flavor yet.
For context on where this bottle ranks against the rest of the catalog, see my guide to choosing the right syrup. For buying it from an authorized source, check where to buy Skinny Mixes authentically.
Keep reading: my full Skinny Mixes brand review, how to pick the right syrup for your diet, and how to actually use Skinny Mixes syrup.