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COVID-19 Vaccines and Blood Clots: Two Large Studies Investigate

Curated by Claudia Shannon / Research Scientist / ishonest

All data and statistics are based on publicly available data at the time of publication. Some information may be out of date. Visit our coronavirus hub and follow our live updates page for the most recent information on the COVID-19 pandemic.

The clots were in unusual locations, such as the veins in the head, and often accompanied by low platelet levels in the blood.

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However, because the number of reported cases was so small, it has been difficult to estimate the increased risk for populations as a whole.

Scientists were also unsure whether the risk of common types of thrombosis also increases.

Part of the problem was that when COVID-19 vaccines became widely available, governments prioritized clinically vulnerable and older people, who are already more prone to thromboses.

In addition, publicity about the risk of blood clots after vaccination may have made doctors more likely to diagnose thromboses. This would give a false impression that they had become more common.

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Two studies that pooled data for millions of patients in the United Kingdom have now found a small increase in the absolute risk of rare types of blood clot in the head. There was no evidence of any increased risk of more common types of blood clot.

“This was the reason we did the study using data from before the date the thrombotic complications of the AstraZeneca vaccine were widely reported,” he told ishonest.

“But our estimates [of the frequency of blood clots], and those done afterward are similar, so this may not be such a concern,” he added.

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The program prioritized extremely clinically vulnerable individuals and those over 70 years, followed by people with chronic illnesses, such as diabetes and high blood pressure, and those over 65 years.

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Overall, 79% of the participants were white, 51% female, and 84% under 70 years.

The researchers compared the incidence of thromboses before and after the first dose of vaccine. They then adjusted the figures to account for other factors that might affect the incidence of blood clots, including age, sex, ethnicity, socioeconomic status, existing medical conditions, and medications.

After adjustments, the overall risk of thromboses was lower in the 28 days after the first dose of either the AstraZeneca or Pfizer-BioNTech vaccine, compared with before vaccination.

For AstraZeneca, the risk of thromboses in veins was 3% and 42% lower in those under 70 and those 70 years or older, respectively. The risk of thromboses in arteries was 10% and 24% lower, respectively, in these age groups.

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The corresponding figures for the Pfizer vaccine were 19% and 43% lower for thromboses in veins, and 6% and 28% lower for thromboses in arteries.

The researchers believe that the most likely explanation for these improvements is that vaccination substantially reduced the likelihood of COVID-19, which can itself cause thromboses, especially in the lungs.

Increased risk of rare blood clots

In people under 70 years of age, the rates of intracranial venous thromboses — blood clots in a vein in the head — or hospitalization with low platelet levels were roughly twice as high in the 28 days after a first dose of the AstraZeneca vaccine.

However, because these events are extremely rare, the absolute increase in the number of events was very small.

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The scientists estimate that after adjustments for other risk factors, the AstraZeneca vaccine may cause between 0.9 and 3 extra cases, depending on age and sex, for every million people vaccinated.

This small increase in risk is easily offset by the reduced risk of becoming sick or dying from COVID-19 that the vaccine provides.

“Most people want accurate information about the pros and cons of the treatments that they take, and we are providing information for them,” said Dr. Whiteley.

“The overwhelming majority of people in the U.K. decide to be vaccinated against COVID-19 when offered a vaccine, and because of this COVID-19 is less of a threat to us all,” he added.

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After a first dose of the AstraZeneca vaccine, the study found no increase in the risk of intracranial thromboses among people 70 years or older.

Following a first dose of the Pfizer vaccine, there was no increased risk either for people older or younger than 70.

The results of the study appear in PLOS Medicine.

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“For older populations, who are most vulnerable to COVID-19, we found no evidence of increased risk of any event with ChAdOx1-S. In younger populations, who have a lower morbidity and mortality due to COVID-19, other available vaccines might be prioritized, especially when the risk of COVID-19 is otherwise low.”

The scientists plan to publish results of their analyses of blood clots after second vaccine doses, and after COVID-19 infections, in future papers.

The second study

In the second study, scientists led by the University of Edinburgh in the U.K. investigated the incidence of a rare type of blood clot in the brain called cerebral venous sinus thrombosis (CVST).

In 2021, several countries withdrew the AstraZeneca vaccine or restricted its use to older people following initial reports of a possible link between the vaccine and CVST.

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The background incidence of CVST is only 3 to 4 per million person-years in adults, but the chances of dying for someone with a CVST is around 4%.

Dr. Steven Kerr, Ph.D., a senior data scientist at the University of Edinburgh, and his colleagues linked electronic medical information from primary care and secondary care, plus mortality and virological test data.

The researchers compared the rate of CVST events for individuals during a 90-day period before their vaccination with the 4 weeks afterward.

This is known as a self-controlled case series, where individuals act as their own control to account for other possible risk factors that they might have that are unchanging over time.

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There were 201 CVSTs in total. Out of these, 81 CVSTs occurred in the follow- up period after the first dose of the AstraZeneca vaccine, or 16.34 events per million doses.

This represents a doubling of the very low initial incidence of CVST, which equates to one extra event for every 4 million people vaccinated.

There were 40 CVSTs among those who received a first dose of the Pfizer vaccine, or 12.6 events per million doses.

This suggests that there is no link between the Pfizer vaccine and CVST.

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The study appears in PLOS Medicine.

Extremely rare event

“It is important to understand that CVST is an extremely rare event, which typically only occurs a handful of times per million people per year,” Dr. Kerr told MNT.

“This should be weighed up against the risk associated with contracting COVID and the level and duration of protection that vaccines offer,” he said.

He added that the relative increase in the risk of CVST following a first dose of the AstraZeneca vaccine may be higher in young people than in older people.

“This is something we may be able to study in the future as we amass data that covers a longer time period,” he added.

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