Herbs & Botanicals

Sarsaparilla (Smilax spp.): Root Traditions, Species Confusion, Research & Safety
Sarsaparilla is a herbal trade name applied to the roots and rhizomes of several Smilax species rather than one universally defined botanical. This evidence-aware guide explains the species problem, steroidal saponins, historical uses, limited human evidence, common marketing myths, safety, and how to buy accurately labeled root. Read more...
Safflower (Carthamus tinctorius): Flowers, Seed Oil, Traditional Use, Human Research & Safety
Safflower (Carthamus tinctorius) supplies both colorful flowers and an edible seed oil, but the two materials are not interchangeable. This evidence-aware guide covers Hong Hua tradition, human research on safflower oil and specialized extracts, pregnancy and bleeding cautions, and practical safety. Read more...
Rue / Herb of Grace (Ruta graveolens): Traditional History, Phototoxicity, Toxicology & Safety
Rue, or Herb of Grace (Ruta graveolens), is a historically important but potentially hazardous botanical. This safety-first guide covers identification, phototoxic furanocoumarins, internal toxicity, pregnancy risk, traditional history, and why medicinal self-dosing is not recommended. Read more...
Rowan / European Mountain Ash (Sorbus aucuparia): Traditional Food Use, Processing, Research & Safety
Rowan, also called European mountain ash, has a long history as a wild food and traditional botanical. This guide separates processed fruit use from raw-fruit and seed hazards, reviews the limited modern evidence, and explains why parasorbic acid and cyanogenic seed compounds matter. Read more...
Rose Flowers & Petals (Rosa × damascena): Traditional Uses, Rose Water, Human Research & Safety
Rose petals—especially Damask rose (Rosa × damascena)—have a long history in food, rose water, perfumery, and traditional herbal practice. This evidence-aware guide separates culinary petals from rose hips and concentrated essential oil, reviews the limited human research, and covers practical safety concerns. Read more...