His top health officials are considering advising that some Americans only take one dose of Moderna's vaccine instead of the recommended two in the hopes of increasing the distribution totals.
It is made by USA company Moderna and works in a similar way to the Pfizer one already being offered on the NHS.
Some 1.5 million people have been given doses of the Pfizer-BioNTech or Oxford-AstraZeneca vaccines since early December, and the government is aiming to have 15 million inoculated by mid-February.
There are hundreds still in development, with some expected to report findings in the near future.
According to the Centers for Disease Control and Prevention's COVID-19 vaccine tracker, the US had distributed 8.9 million doses of Pfizer's and Moderna's COVID-19 vaccines as of Monday afternoon.
That figure includes nearly a quarter of those aged over 80 in England - people at highest risk of severe illness or death from the virus.
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The prime minister has said the aim is to vaccinate 15 million people in the United Kingdom by mid-February, including care homes residents and staff, frontline NHS staff, everyone over 70 and those who are clinically extremely vulnerable.
But 22.1 million doses have been distributed nationwide, underlining the logistical challenge of getting the injections administered to the elderly and health workers who are the priority.
The EU has ordered 80 million doses of the Moderna vaccine with an option for a further 80 million.
"Possible conclusion - end of Jan, depending on data and evaluation progress", the EMA said on Twitter.
Romualdez said the private sector, led by Enrique Razon, chairman and president of the International Container Terminal Services, has pledged free shipping of the Moderna vaccines from the manufacturing facility in Spain.
The AstraZeneca jab is easier to store and distribute, as it can be kept at normal fridge temperature.
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Von der Leyen said 75 million of the extra shots would be delivered in the second quarter of this year.
Website domains containing the word vaccine in combination with COVID-19 or coronavirus more than doubled since October to roughly 2,500 in November, when the first legitimate vaccines were nearing regulatory approval, according to cybersecurity firm Recorded Future, which is tracking COVID-19 fraud online.
She affirmed that the commission would be monitoring the vaccination process along with the European Center for Disease Prevention and Control. For all of the Covid vaccines, we still do not know how long immunity will last.
"This vaccine provides us with another tool to overcome the current emergency", said EMA Executive Director Emer Cooke.
In the U.S., over 15 million doses of the Covid-19 vaccines have been distributed, but only 4.5 million people have received their first dose.
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Meanwhile, the border between Canada and the United States will remain closed to non-essential travel for another month. Canada's vaccine rollout to date lags behind that of other major Western nations, according to Our World in Data .