In particular it highlights the plans for four extra bank holidays a year which would reduce the number of working days a year in the NHS.
A thinktank believe Jeremy Corbyn's manifesto could crush manpower in the NHS
The bank holiday plans are part of a series of bribes being offered to Labour to make their high tax socialist policies more palatable.
Corbyn has already pledged to stop the plans for a seven day NHS which means it will be available for people around the week instead of emergency only treatment on weekends and bank holidays.
The Bow Group have penned a letter to NHS chief executive Simon Burns outlining their concerns
Dr Jonathan Stanley, the health research fellow at the Bow Group, has said that the additional holiday plans will have far reaching consequences for a health service which already is struggling to provide the service needed across the UK.
He notes that the bank holiday plans alone will mean a cut in hours that GP surgeries open.
There will also, under Corbyn's proposals, be less doctors in hospital, equivalent to a loss of several thousand Whole Time Equivalent doctors.
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The potential impact of four less working days a year in the NHS would be substantial
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Dr Jonathan Stanley, Bow Group
He adds that it would also lead to fewer elective surgery slots leading and longer waiting lists, delays in cancer diagnosis and treatment.
For a health service that needs an estimated £10 billion spent on it, there would also be productivity losses of several billion pounds thanks to the staff shortages caused as well as cuts to final salary pensions as salaries would either be cut or contributions rise to protect pensions.
Dr Stanley said: “The potential impact of four less working days a year in the NHS would be substantial.
Jeremy plans to introduce four extra bank holidays which could decrease working days in the NHS
“There is a proposal by one major political party to have an extra four Bank Holidays a year."
“What plans have been made by NHS England in the event of this policy being introduced by the end of the next parliament. Have any Sustainability and Transformative Partnerships modelled this policy proposal?"
Labour's proposals would put massive pressure on NHS budgets with required health spending expected to be £30 billion higher by 2022/23 according to the independent Office of Budget Responsibility (OBR).
Labour announced plan to raise taxes to their highest levels for 70 years to help fund the NHS
Labour has announced plans to raise taxes to their highest levels for 70 years to help fund extra spending on the NHS.
Meanwhile the Tories will means test winter fuel payments to free up cash for health and social care spending.
Ukip have pledged to take £13 billion out of the aid budget to spend on the NHS.