Right Sizing Safety Substantiation for Simple Formulas

A maker asked me recently whether their four-ingredient lip balm needed the same safety substantiation file as their new vitamin C serum, and the honest answer is no, but the reasoning behind that answer matters more than the answer itself.

What substantiation is actually for

MoCRA requires safety substantiation, meaning adequate support that a cosmetic product is safe under the conditions of use on the label or that are customary. It doesn't hand you a fixed checklist or a specific test panel you must run regardless of product type. It asks you to be able to demonstrate the product is safe, and the amount and kind of evidence that takes depends heavily on what's actually in the product and what it does.

This is where a lot of small makers either overspend on unnecessary testing out of anxiety, or underspend by treating "safety substantiation" as a box to check rather than a real judgment call about risk.

What makes a formula genuinely low-risk

A handful of characteristics tend to line up with a product that needs a lighter substantiation file:

• A short, well-characterized ingredient list. Beeswax, a couple of common carrier oils, maybe a small amount of a well-known fragrance oil. Each ingredient individually has a long history of cosmetic use and a well-documented safety profile.
• Anhydrous or low-water formulation. No water content, or very little, generally means lower microbial risk, which is one whole category of safety concern you're not carrying the same weight on.
• No active ingredients making a functional claim beyond basic moisturizing or protective effect. A lip balm that just claims to moisturize and protect from dryness is a very different substantiation conversation than one that claims to visibly plump lips or deliver an active ingredient at a therapeutic-sounding concentration.
• Leave-on but low surface area and low absorption context. Lip balm sits in a slightly unusual category, technically leave-on, but applied in small amounts to a limited area, which is a real factor in risk assessment even though it isn't a free pass on its own.

For a product like this, a reasonable substantiation file often leans heavily on existing, well-established safety information for each individual ingredient at its used concentration, a sound rationale for why the combination doesn't introduce new risk, and confirmation that nothing in the formula is restricted or requires special handling.

What pushes a formula toward needing more

A leave-on serum with actives sits at the other end of the same spectrum, and the same characteristics run in reverse:

• Active ingredients at meaningful concentrations, retinoids, acids, high-percentage vitamin C, botanical extracts standardized for a specific active compound. These carry their own individual safety literature, and their combination and concentration in your specific formula is part of what needs supporting.
• Water-containing formulations carry preservation and microbial safety considerations that a simple anhydrous balm doesn't.
• Marketing claims that go beyond basic moisturizing, brightening, anti-aging, barrier repair, pore appearance, tend to invite closer scrutiny of whether the substantiation actually supports what's being promised, separate from whether the product is merely safe.
• Broader application area and prolonged leave-on contact, a full-face serum applied daily over years, versus a lip product applied in small amounts.

A practical comparison

Factor	Simple lip balm	Active-ingredient leave-on serum
Ingredient count and complexity	Low, well-known ingredients	Higher, may include newer or higher-concentration actives
Water content	Often none or minimal	Usually water-based
Application area and frequency	Small area, moderate frequency	Larger area, often daily
Claims made	Basic moisturizing or protective	Often functional or performance claims (brightening, anti-aging)
Substantiation weight needed	Leans on established per-ingredient safety data and sound formulation rationale	Needs a fuller file addressing combination, concentration, and claim support

The judgment call you actually have to make

The point isn't that simple products get a free pass and complex products get a burden. It's that substantiation is supposed to be proportionate to actual risk, and treating every product identically, either over-testing the lip balm or under-documenting the serum, misses what the requirement is asking for. If you're genuinely unsure where your product sits, it's worth thinking through the specific risk factors above rather than defaulting to whatever level of documentation feels safest to your anxiety rather than to the actual formula.

Document your reasoning either way. A short written rationale explaining why a simple formula's substantiation is proportionate, referencing the established safety profile of each ingredient and the low-risk characteristics of the product, is itself part of a defensible substantiation file, and it's a lot cheaper to write now than to reconstruct after the fact.

Cosmetic Comply doesn't build your safety substantiation file for you, but the ingredient-level groundwork it produces, accurate INCI names, real concentrations with supplier blends expanded out, and a screened list against relevant restrictions, is exactly the kind of foundation a proportionate substantiation rationale gets built on top of.