Oyster shell and Stroke - a phase IV clinical study of FDA data

Summary:

Stroke is reported as a side effect among people who take Oyster shell (calcium), especially for people who are male, 60+ old, have been taking the drug for < 1 month also take Vitamin D3, and have Multiple myeloma.

The phase IV clinical study analyzes which people have Stroke when taking Oyster shell. It is created by eHealthMe based on reports of 726 people who have side effects when taking Oyster shell from the FDA, and is updated regularly.

What is Oyster shell?

Oyster shell has active ingredients of calcium. eHealthMe is studying from 731 Oyster shell users. Check the latest studies of Oyster shell.

What is Stroke?

Stroke (sudden death of a portion of the brain cells due to a lack of oxygen) is found to be associated with 2,365 drugs and 3,015 conditions by eHealthMe. Check the latest studies of Stroke.

On Jan, 24, 2026

726 people reported to have side effects when taking Oyster shell.
Among them, 10 people (1.38%) have Stroke.

Among these 10 people:

How long have people been on Oyster shell when they have Stroke? *

What is the gender of people who have Stroke when taking Oyster shell? *

female: 40 %
male: 60 %

What is the age of people who have Stroke when taking Oyster shell? *

What are other drugs people take besides Oyster shell? *

Vitamin D3: 3 people, 30.00%
Revlimid: 2 people, 20.00%
Velcade: 2 people, 20.00%
Crestor: 2 people, 20.00%
Seroquel: 2 people, 20.00%
Nexium: 2 people, 20.00%
Isosorbide Mononitrate: 1 person, 10.00%
Keppra: 1 person, 10.00%
Detrol La: 1 person, 10.00%
Hydrocodone: 1 person, 10.00%

What are other side effects people have besides Stroke? *

Diabetes: 3 people, 30.00%
Joint Pain: 2 people, 20.00%
Heart Attack: 2 people, 20.00%
Chest Pain: 2 people, 20.00%
Enterobacter Infection (infection caused by bacteria of the family enterobacteriaceae): 1 person, 10.00%
Hypofibrinogenaemia (a decrease in plasma fibrogen level): 1 person, 10.00%
Hypoaesthesia (reduced sense of touch or sensation): 1 person, 10.00%
Headache (pain in head): 1 person, 10.00%
Hand Fracture: 1 person, 10.00%
Glaucoma (increased fluid pressure in the eye with vision loss): 1 person, 10.00%

What are the existing conditions these people have? *

Prostate Cancer: 2 people, 20.00%
Multiple Myeloma (cancer of the plasma cells): 2 people, 20.00%
Vena Cava Thrombosis (clotting of the blood in large vein carrying deoxygenated blood into the heart): 1 person, 10.00%
Stress And Anxiety: 1 person, 10.00%
Schizophrenia (a mental disorder characterized by a breakdown of thought processes): 1 person, 10.00%
Pelvic Venous Thrombosis (blood clot occurring inside a blood vessel and thromboses (dvts) that form in the deep veins of the legs or in the pelvic veins): 1 person, 10.00%
Pain: 1 person, 10.00%
Osteoporosis (bones weak and more likely to break): 1 person, 10.00%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 1 person, 10.00%
Depression: 1 person, 10.00%

* Approximation only. Some reports may have incomplete information.

Do you take Oyster shell and have Stroke?

- Check whether Stroke is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously

Related studies:

Effectiveness of, long term effects of, and alternative drugs to Oyster shell:

Oyster shell (731 reports)

Stroke treatments and more:

Stroke (334,632 reports)

Browse all side effects of Oyster shell:

a b c d e f g h i j k l m n o p q r s t u v w x y z

Browse all the drugs that are associated with Stroke:

Stroke (2,365 drugs)

Browse all the conditions that are associated with Stroke:

Stroke (3,015 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on calcium (the active ingredients of Oyster shell) and Oyster shell (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered. Dosage of drugs is not considered in the study.

How to use the study?

DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.

Who is eHealthMe?

With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).

WARNING, DISCLAIMER, USE FOR PUBLICATION

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.