Here we look at the claims for this widely promoted supplement

Version: 2.0 Last updated: April 2023 To be reviewed: October 2025

Treatment details

Illustration of a bottle with a star on the front of it.


Branded dietary supplement



Evidence of harm



No or limited evidence that it is effective



The makers claim

Silencil is a “brain-cell repairing nutrient to shut down tinnitus and recover hearing”[1].

What is the treatment?

Silencil is a capsule which you take once a day.

The supplement claims to be a combination of 28 ingredients, but only the following have been listed[2]:

Ashwagandha; Mucuna pruriens; Oat straw; Vitamin B1 (thiamine); Vitamin B2 (riboflavin); Vitamin B6; Gamma-aminobutyric acid (GABA); Rhodiola; L-Theanine; Skullcap; Hawthorn; Chamomile; Potassium. We have been unable to find out what the others are.

What are the downsides of this treatment?

Potential side effects from constituents[3-8].

Cost – this supplement currently is on sale for $69 for one month’s supply excluding shipping and taxes[1].

Has there been research into this treatment?

There have been no papers published on Silencil as a supplement, but there have been a number published on its component parts.

What does the research say?

There is no evidence that any of the known components of this supplement are effective for treating tinnitus[5,8-17]. Although some of the components are thought of as safe, some may be harmful, in particular ashwagandha[3], Mucuna pruriens[4], Vitamin B6 (if taken for prolonged periods)[5], L-theanine in large doses[6], skullcap[7] (if Galerina autumnalis is the plant being referred to), potassium[8] (if taken in large doses).

Although independent evidence is limited, what there is does not show that the components of this supplement are effective for tinnitus and that there may be risks involved in taking this supplement.

We would suggest you talk to your GP before taking any new medication or supplement. Dietary supplements should not be recommended to treat tinnitus[18].

Note that the retailer’s website states “Products are not intended to diagnose, treat, cure or prevent any disease.”[1]

Tinnitus UK


There appears to be a lot of similarity between the marketing of this product and other products such as Sonus Complete and Tinnitus 911 – please see the relevant treatment pages for details.


2. Lachey, B. Silencil Supplement Review: Ingredients That Help Tinnitus? Available

3. US National Library of Medicine. Ashwaganda.

4. Australian Centre for International Agricultural Research. Factsheet – Mucuna pruriens.

5. National Institutes of Health Office of Dietary Supplements. Vitamin B6.

6. Hu J, Webster D et al. The Safety of Green Tea and Green Tea Extract Consumption in Adults – Results of a Systematic Review. Regulatory Toxicology and Pharmacology.(2018) 95. 412-433. DOI: 10.1016/j.yrtph.2018.03.019

7. Tyler VE, Malone MH et al. Chromatographic and pharmacologic evaluation of some toxic Galerina species. Lloydia.(1963) 26 (3): 154–7.

8. WebMD LLC. Potassium – Uses, Side Effects, and More.

9. The Drugsite Trust. Ashwaganda.

10. The Drugsite Trust. Oats.

11. US National Library of Medicine. Thiamine.

12. US National Library of Medicine. Riboflavin.

13. Healthline Media. What does Gamma-aminobutyric acid (GABA) do?

14. The Drugsite Trust. Rhodiola

15. The Drugsite Trust. Green tea.

16. Orhan IE. Phytochemical and Pharmacological Activity Profile of Crataegus Oxyacantha L. (Hawthorn) – A Cardiotonic Herb. Current Medicinal Chemistry. (2018) 25(37) 4854-4865. DOI: 10.2174/0929867323666160919095519

17. National Center for Complementary and Integrative Health. Chamomile.

18. Coelho C, Tyler R et al. Survey on the Effectiveness of Dietary Supplements to Treat Tinnitus. American Journal of Audiology. (2016) 25(3): 184-205