Andrographis paniculata

"Bile of the earth" is a name earned by taste: hempedu bumi is among the
bitterest plants in the Malay garden pharmacopoeia. Ong and colleagues'
2011 ethnobotanical survey in Kampung Mak Kemas, Terengganu, records the
plant in living Malay use — as infusions and decoctions taken for fever
and other internal complaints [1]. That detail matters for this monograph:
the well-documented Malay uses are oral. The wider regional record,
assembled in the Hossain 2014 review, includes external skin applications
in Indian and Chinese tradition [2], so the topical framing has a
traditional basis — but a thinner and less local one, and this entry says
so rather than assuming it.

The plant's bitterness and most of its studied activity belong to the
diterpene lactones — andrographolide first, with neoandrographolide and
14-deoxyandrographolide alongside — plus flavonoids and polyphenols,
characterised in the Chao and Lin 2010 review [3]. Andrographolide is a
covalent inhibitor of NF-κB activation, a mechanism Xia and colleagues
(2004) mapped to a specific cysteine residue [4] — laboratory work that
makes the skin question plausible without answering it.

Direct evidence for skin use is a single preclinical study: Al-Bayaty and
colleagues (2012) applied 5% and 10% leaf-extract dressings to wounds in
rats and reported faster closure and narrower scars than placebo [5].
Nothing in the verified human literature tests the plant on skin. The
substantial clinical corpus — summarised for upper respiratory infection
by Coon and Ernst (2004) [6] — is oral, and is cited here only to show
where the clinical evidence actually lives.

A traditional practice documented mostly for oral use, one animal study
for the topical route, and no human data: that is a C, and the honest
question is whether the topical framing deserves clinical study at all
before a formulated product leans on it.

The oral safety record is comparatively well characterised: a 2021
systematic review and meta-analysis found serious adverse events very rare
across ten randomised trials [7]. The signal that matters for skin
products is hypersensitivity: Thai pharmacovigilance data record
urticaria, pruritus, angioedema and anaphylaxis among users [8]. Whether
systemic hypersensitivity translates into contact sensitisation on
compromised skin has not been studied — no patch-test data exist — so a
cautious patch test before use and immediate discontinuation on any
reaction are the sensible minimum. Not for broken skin; diagnosed skin
conditions need clinical care.

Two further findings belong here. A systematic review and meta-analysis
separated the adverse-event profile of injectable andrographolide
derivative medicines from that of whole-herb preparations, which are the
better tolerated of the two [9] — a distinction worth preserving whenever
the Thai pharmacovigilance signals are cited. And Malaysian work at
Universiti Kebangsaan Malaysia reported suppression of male reproductive
parameters in rats given a methanolic extract [10]. That is an animal
result for an oral route, but it is a locally generated signal in a plant
widely taken as a household remedy, and it is the finding most deserving
of a reviewer's attention here.