Water
Appears in 8 scanned products.
Plain water, almost always the largest ingredient by weight in a formula and typically purified or deionized before use.
Why it’s used
Serves as the solvent base that dissolves or disperses other ingredients, forming the foundation of most creams, lotions, shampoos, and gels.
What the evidence says
We don’t have a source for this one we can show you, so we’re not summarising the evidence here.
Look it up yourself
We would rather point you at the shelf than summarise something you can’t check. These are the same places we search:
- PubChem — what the substance is, chemically — names, synonyms and structure
- PubMed — every paper indexed by the US National Library of Medicine that names it
These are starting points, not our findings — we haven’t run them for you. A substance whose name is also an ordinary word (“Heart”, “Alanine”, “Water”) will return papers that are not about the ingredient at all.
Context
Present in nearly all rinse-off and leave-on products; its listing high on an ingredient list simply reflects that it makes up most of the product's weight, not a formulation choice worth scrutinizing.
As a supplement
Talk to your doctor or pharmacist.
Roll Call does not check drug interactions or assess personal safety.
Plain water, used as a solvent or carrier in liquid supplement formulations, or in the manufacturing process of tablets and capsules.
Why it’s used
Used to dissolve, suspend, or process other ingredients; not included for any effect of its own.
What the evidence says
No efficacy question applies, since water in this context is a manufacturing vehicle rather than an active ingredient.
Where we looked
There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.
- PubMed: 1243 records · searched August 2026
"Water"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH] - PubMed: 1168216 records · searched August 2026
"Water"[Title/Abstract]
This says what this database holds under these terms. It is not a finding that no research exists.
Context
Not applicable; there is no studied dose because it is not a dietary supplement ingredient in the active sense.
As a household ingredient
The same H2O that comes out of a tap, purified to a consistent standard for manufacturing.
Why it’s used
It is the base that everything else is dissolved or dispersed into. In a cleaner or dish soap it carries the surfactants and other actives to the surface being cleaned; in a candle or wax melt it typically does not appear at all, since those are oil-based.
What the evidence says
Water is not a subject of toxicological concern in this context. No regulatory body evaluates it for hazard in a finished product.
Context
Contact is with skin and surfaces during use, exactly as expected, and carries no separate exposure consideration of its own.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.