When dentist Andy Bates offered to help administer the coronavirus vaccine, he hadn't bargained for the "overload of bureaucracy" he says came his way.
Dr Bates, from North Yorkshire, is one of a number of health staff to criticise the paperwork needed to gain NHS approval to give the jabs.
Some medics have been asked for proof they are trained in areas such as preventing radicalisation.
The NHS said training and checks were needed.
A spokesman for the NHS told the BBC: "Regardless of a person's background in healthcare, appropriate training and checks are necessary to handle the vaccine.
"[This] is why important processes are in place to make sure that former members of staff are up to speed on protocols and delivery, so that vaccinators are fully equipped with the skills to safely vaccinate patients in line with Public Health England standards."
Dr Bates, a 56-year-old dentist based in Skipton, says he was met with layers of "bureaucracy" when he applied to be an NHS vaccinator - a role that requires healthcare experience.
He told BBC Radio's 5 live programme: "I am a working dentist with a dental practice. I work four days a week which gives me a day off and the weekend, so I thought I could probably help out [with] explaining things to people, being able to use a needle, being able to relax people in an environment where you're giving them a jab.
"It's part and parcel of the job of being a dentist."
But he says he and two of his dental staff who also applied for roles have been asked to upload a "huge list of documents" and complete online modules proving they are trained in certain areas to progress their applications.
Dr Bates says: "Some of the things are really quite sensible - like resuscitation, and recognising and managing anaphylaxis - but then you get things like preventing radicalisation, level 1 certificate required [or] safeguarding children level 2."
"Children aren't a priority for vaccination, [so] I really don't think we're going to be seeing children."
"To be a registered dentist and CQC registered dental practice, which you have to be, these are things that we have to prove to the CQC and declaring to the General Dental Council (GDC) every year that we have done and kept up to date various trainings."
But he said separating all these skills out according to the website's requirements "would be really quite a task" given his other work commitments.
"I must admit, I gave up at the second hurdle, because I'm very busy as a dentist and I do get home quite tired at night. I thought 'good grief, If I have to go through all this', I'm not [doing it]."
Dr Bates believes that registered healthcare practitioners should be able to apply through their registration details, with a thorough identity check that would fast-track them through the necessary training.
It comes as batches of the Oxford/AstraZeneca vaccine have started arriving at hospitals. Some 530,000 doses of the jab will be available for rollout across the UK, with vulnerable groups already identified as the priority for immunisation.
The UK now hopes to accelerate its vaccination rollout,
amid a rise in cases driven by a new variant of coronavirus, by giving both parts of the Oxford and Pfizer vaccines 12 weeks apart, having initially planned to leave 21 days between the Pfizer jabs.
The UK's chief medical officers have defended the Covid vaccination plan, after criticism from a doctors' union, insisting that getting more people vaccinated with the first jab "is much more preferable".
Prof Martin Marshall, chair of the Royal College of GPs, said recently retired medics and other healthcare professionals have "huge amounts of skill and experience" to offer the vaccine effort and called for "bureaucratic barriers" to be kept to "the bare minimum".
He added: "Requiring people to submit more than 20 pieces of documentation, some of which have low relevance to the task they will be doing, and some of which some retired medics and returners to the profession won't even have, is a deterrent for them getting involved at a time when we need all hands on deck."
An NHS spokesman added that "tens of thousands of people have already completed their online training" which "are being processed as quickly as possible and vaccinators will be deployed as and when they are required".
He added: "It is categorically untrue that there are any delays in Covid vaccination caused by accrediting volunteers or returners."