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Active Ingredient Compatibility

pH windows, stability rules, and combination guidance for the most common actives — vitamin C, retinol, niacinamide, AHAs, and peptides.

Anhydrous Scrubs

Oil-based sugar and salt scrubs — no water phase means no preservative needed.

AquaMath (Water-Based Formula Calculator)

Build serums, toners, facial mists, water gels, hair rinses, and body mists with phase tracking, solubilizer math, and a full warning system.

BalmMath (Anhydrous Calculator)

Master BalmMath for lip balms, body balms, lotion bars, whipped butters, oil serums, and more.

Banned Cosmetic Ingredients by State

Which cosmetic ingredients California, New York, Minnesota, Maryland, Washington, Colorado, and Illinois have restricted or banned beyond federal FDA rules.

Batch Math

Scale recipes up or down and convert between percentages and weight.

Batch Records for Small Makers

What to record per batch, why it matters for traceability and recalls, and a simple format to get started.

Beginner Guide to Lotion Making

How emulsions work, what ingredients you need, and how to make your first lotion safely.

Beginner Guide to Soapmaking

Everything you need to make your first batch of cold process soap safely — from lye safety to cure time.

Beginner Guide to Surfactant Formulation

How surfactants work, the four charge types, and how to build a basic liquid cleanser.

Body Mist & Body Spray

Lightly fragranced body sprays — solubilizer math, IFRA Category 2 limits, and preservation.

Body Wash

Liquid body wash from scratch — surfactant selection, ASM targets, and thickening.

Bubble Bath

High-foaming bubble bath — maximize foam longevity and build a stable aqueous formula.

BubbleMath (Surfactant Calculator)

Step-by-step guide to building surfactant formulas with BubbleMath.

Business Plan for Soap & Cosmetics

A practical business plan framework for small makers — product focus, true COGS, pricing, and 12-month financial projections.