Two Very Different “Natural” Approaches
If you have started looking for natural support for a dog with Cushing’s Syndrome or Cushing’s disease (hyperadrenocorticism), you have almost certainly run into two competing camps. On one side are lignans and melatonin. On the other are herbal “adrenal blends” built around adaptogens such as ashwagandha, holy basil, and bacopa. Both are marketed for the same purpose—helping to balance cortisol and support the adrenal glands—but they work in very different ways, and the quantity and quality of the evidence supporting each differ greatly.
This article looks at what each approach actually does inside the body and, more importantly, what the published research shows. Our goal on this site is never to sell you something; it is to help you understand the condition well enough to have a genuinely informed conversation with your veterinarian.
How Lignans and Melatonin Work
Lignans are plant compounds found in high concentrations in flaxseed, sesame seeds and many other plants. In the body they are converted by gut bacteria into the enterolignans enterolactone and enterodiol. Both of these, along with melatonin, are thought to inhibit the enzymes aromatase and 3-beta-hydroxysteroid dehydrogenase — enzymes the adrenal gland uses to manufacture cortisol and sex hormones. By dialing those enzymes down, the adrenal gland produces less of the excess hormone that drives Cushing’s signs.
This is not just theory. In a controlled laboratory study published in the American Journal of Veterinary Research (Fecteau et al., 2011), adding either or both of the enterolignans enterolactone or enterodiol together with melatonin to stimulated adrenal carcinoma cells produced significant decreases in estradiol, androstenedione, and cortisol at both 24 and 48 hours, compared with cells that were stimulated but left untreated. In other words, the combination acted directly on adrenal cells to lower the principal hormones that are elevated in Cushing’s. The authors of that paper have also confirmed that their clinical experience confirms this result and, further, that, in addition to those hormones, progestin levels are also reduced in many cases.
The University of Tennessee’s College of Veterinary Medicine, where much of this work originated, has reported that the lignan-and-melatonin combination helps control atypical hyperadrenocorticism in some dogs. It is the mechanism-plus-evidence pairing that makes this approach stand out.
Lignan and melatonin supplements formulated for dogs at these dose levels are available from our sponsors at lignans.com
How Herbal Adrenal Blends Work
Herbal adrenal formulas take a broader, more traditional approach. Adaptogens like ashwagandha, holy basil (tulsi), astragalus, and bacopa have a long history in Ayurvedic and traditional Chinese medicine, and are described as helping the body “adapt” to stress and modulate the stress response. Many blends also add milk thistle or turmeric for liver and antioxidant support.
These are legitimate, well-known botanicals, and there is human and laboratory research suggesting some adaptogens can influence cortisol under stress. The important caveat for dog owners is this: very little of that research was done in dogs, and almost none of it was done in dogs that actually have Cushing’s syndrome or Cushing’s disease. The formulas are plausible and generally well tolerated, but the direct, Cushing’s-specific evidence base is close to non-existent. We are also unaware of reports from veterinarians confirming successful use in practice.
Comparing the Evidence
This is where the two approaches genuinely diverge. Lignans and melatonin have a documented, Cushing’s-relevant mechanism and a peer-reviewed study showing they lower cortisol and adrenal sex hormones in adrenal cells, plus a veterinary teaching hospital reporting clinical use in all types of Cushing’s cases (whether typical or atypical, whether pituitary-dependent, adrenal-dependent or ectopic). Herbal adaptogen blends rest largely on traditional use and on human or general stress-physiology studies, rather than canine hyperadrenocorticism trials.
That difference does not make adaptogens “bad.” It means that if you are choosing where to place your confidence, the lignan-and-melatonin pathway is the one with research pointing specifically at the mechanism of Cushing’s in dogs.
What This Means for Your Dog
No supplement — herbal or lignan-based — is a substitute for a proper diagnosis and veterinary oversight. Cushing’s is confirmed with specific testing, and dogs with some forms of the disease may still need conventional medication such as trilostane or chemotherapy drugs. Natural support is best thought of as part of a plan built with your vet, not a replacement for one.
That said, if you are weighing the natural options, it is reasonable to ask a simple question of any product: what is the evidence that this specific formula does what it claims in dogs with Cushing’s? For lignans and melatonin, there is a clear answer to point to.
The Bottom Line
Both lignans/melatonin and herbal adrenal blends aim to support a dog’s adrenal balance, but only one of them — lignans and melatonin — is backed by published, Cushing’s-specific veterinary research showing a direct effect on adrenal hormone production. Whichever route you consider, bring it to your veterinarian so it fits alongside proper testing and monitoring.
Sources
- Fectau KA, Eiler H, Oliver JW, et al. “Effect of combined lignan phytoestrogen and melatonin treatment on secretion of steroid hormones by adrenal carcinoma cells.” Am J Vet Res. 2011;72(5):675. avmajournals.avma.org
- University of Tennessee College of Veterinary Medicine — Treatment Option Considerations for Hyperadrenocorticism in Dogs (PDF). vetmed.tennessee.edu
- Merck Veterinary Manual — Cushing Disease (Pituitary-Dependent Hyperadrenocorticism) in Animals. merckvetmanual.com
