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Open Source Apothecary At Home / The twelve-month course
The skin as an organ, and the best first apothecary project there is.
guideThe physiology. Skin is the largest organ and its main job is the barrier — a physical, chemical and immunological wall that keeps water in and everything else out. The barrier is made of corneocytes in a lipid matrix, which is why an oil-based preparation supports barrier function and a water-based one does not. That is the chemistry behind the salve.
Why topical is where plant medicine genuinely competes. A preparation applied to skin acts where it is applied, at a concentration you control, without being metabolised in the gut. Calendula and chamomile for irritation, aloe for burns, honey for wounds — this is the category where the plant literature has real randomised trials, and it is also where the most common harm occurs: repeated neat essential-oil application causing permanent allergic contact dermatitis.
The infused oil is the technique of the month, and it is the best first project in the whole course because it uses a harvest you can produce in the first season and the result is visibly useful.
The oxidation chemistry matters. Terpenes oxidise on storage into allergens more potent than the parent compounds. So an old, half-used essential oil is more allergenic than a fresh one — the intuition about age is backwards, and it is why citrus oils and lavender should be replaced rather than hoarded.
Infused oils go rancid. 6-12 months refrigerated, checked by smell. A rancid oil on skin is worse than no oil.
The limits are the point. Calendula is not an antibiotic. Honey is not for a systemic infection. And infection under a dressing — increasing pain, spreading redness, heat, pus, fever — is the thing to watch for.
Burn injuries cause severe pain, infection risks, psychological distress, financial burdens, and mortality, necessitating effective care.PubMed 38605441 ↗
Topical aloe vera usage for second-degree burn wound healing demonstrated significantly faster time to healing compared with other treatments.PubMed 36264753 ↗
AV might have beneficial effects in reducing pain scores and the severity of mucocutaneous problems compared with placebo, especially with limited mild to moderate adverse effects.PubMed 33336470 ↗
It was often uncertain whether antiseptics were associated with any difference in healing, infections, or other outcomes.PubMed 28700086 ↗
There is no robust evidence on the relative effectiveness of any antiseptic/antibiotic/anti-bacterial preparation evaluated to date for use on SWHSI.PubMed 27021482 ↗
We could not find conclusive evidence that CHM taken by mouth or applied topically to the skin could reduce the severity of eczema in children or adults.Well-designed, adequately powered RCTs are needed to evaluate the efficacy and safety of CHM for managing eczema.PubMed 24018636 ↗
In season: flowers at their peak
| Plant | Harvest | Notes | |---|---|---| | Calendula | Open flowers, daily | Flowers left on set seed and stop producing | | Chamomile | Fully open flowers | Surface-sown earlier; 8-10 weeks from sowing | | Yarrow | Flowering tops, midsummer approach | Wild here — check before planting | | Lavender | Flower spikes, just as flowers open | The oil is highest just before full open | | Rose | Petals, morning | Hips come later, after first frost |
Harvest rules
Project: calendula infused oil, then a salve
Infused oil — the correct method
Salve
Aloe for burns, done properly