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The honest truth about lotion. Lotion contains water, and anything with water grows mold and bacteria without a broad-spectrum preservative — often within days, sometimes invisibly. The popular "just oil + water + beeswax, no preservative" recipes are not safe to keep. This guide uses a real emulsifier and preservative. If you refuse to use a preservative, make a water-free body butter instead. Cosmetic/educational only; patch-test first.

A lotion is an emulsion — tiny droplets of oil suspended in water (or vice versa). To hold them together you need an emulsifier; to keep it safe you need a preservative. Get those two right and the rest is easy. Cosmetic formulas are written in percentages by weight so they scale perfectly — weigh everything.

The formula (by weight %)

  • Water phase: distilled water — 70% (you can use up to ~5% as aloe juice or a hydrosol)
  • Oil phase: carrier oils (e.g. sweet almond, jojoba) — 15%
  • Shea or cocoa butter — 5%
  • Emulsifying Wax NF — 6% (this is what bonds oil + water; plain beeswax will NOT do this reliably)
  • Vegetable glycerin — 2.5% (humectant, optional)
  • Broad-spectrum preservative — ~1% (follow your product's exact rate, e.g. Optiphen, Geogard ECT)
  • Essential oil — ~0.5% (optional)

For an ~8 oz / 230 g batch: ~160 g water, ~35 g oils, ~12 g butter, ~14 g e-wax, ~6 g glycerin, ~2 g preservative, a few drops EO.

Step-by-step (the two-phase method)

  1. Heat both phases. In one heatproof bowl combine the water phase. In another combine the oils, butter and emulsifying wax. Set both in a water bath and heat to about 70°C (160°F), holding for ~20 minutes (this "heat & hold" helps the emulsion and reduces microbes).
  2. Combine. Pour the water phase into the oil phase. Immediately blend with a mini mixer/whisk — it turns milky and creamy as it emulsifies.
  3. Cool while stirring. Keep stirring gently as it cools and thickens.
  4. Add the cool-down ingredients. Once it's below 40°C, mix in the preservative (heat destroys many of them) and essential oil.
  5. Bottle. Spoon or pour into a pump bottle. Label with the date.

🧫 Keep it clean

Sanitize your tools and bottles with isopropyl alcohol first, and use distilled (not tap) water. Cleanliness + preservative = a lotion that's safe for months. *Shelf life assumes proper preservative and clean technique.

Troubleshooting

It separated: phases weren't both hot enough, or not enough emulsifier — reheat and re-blend, or add 1% more e-wax next time. Too thick/thin: adjust the butter/e-wax up or water down (and vice versa). Grainy: shea butter can be temperamental — heat fully and cool quickly.

FAQ

Can I really not skip the preservative? Not if water is present and you want to keep it — mold can grow unseen and cause infections. Is vitamin E a preservative? No — it's an antioxidant that slows oils going rancid; it does not stop microbes. What if I want zero preservative? Make an anhydrous (water-free) product: body butter, balm, or oil.