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Flu, Faith and a Few Tricky Questions: The Gelatine Conversation We Need to Have
Every year, as flu season approaches, many of us in immunisation clinics find ourselves having the same conversation beginning with - often quietly, sometimes hesitantly- “I heard this vaccine contains pork?”
And behind that question sits something much bigger- faith, ethics, identity, and trust.
This blog isn’t about telling people what they should decide. It’s about helping us navigate these conversations honestly, respectfully, and with good evidence.
What’s actually in the flu vaccine?
In the UK childhood programme, the nasal flu vaccine (e.g. Fluenz Tetra) contains porcine gelatine. This is used as a stabiliser to protect the live attenuated virus during storage and administration. Gelatine is derived from collagen - commonly from pigs in this context - and is present in very small quantities and is highly processed - but for many, the origin still matters.
In contrast, the injectable flu vaccines do not contain porcine gelatine.
The key point:
Nasal flu vaccine contains porcine gelatine (preferred for children)
Injected flu vaccine does NOT contain porcine gelatine
But the decision is not just “vaccine or no vaccine” - it’s more around the choice of:
More effective option with porcine content?
Less effective option without it?
Why does this matter more for flu than, say, MMR?
This is where it’s really important we’re accurate. In the UK, there are two MMR vaccines, MMRVaxPro which contains porcine gelatine and Priorix which does NOT contain porcine gelatine. Crucially, They are considered equally safe and effective. So with MMR, there is a genuine like-for-like alternative. That makes the ethical decision much more straightforward.
Flu is different.
For children, the nasal vaccine is easier to give, often more effective, PLUS, let's not forget- better at reducing community transmission. So declining it in favour of the injectable option isn’t neutral - it’s a trade-off. And that’s where the ethical tension really sits.
Islamic perspectives: necessity, transformation, and preservation of life
Islamic scholars have explored this issue extensively. The Qur’an includes the well-known principle:
“He has only forbidden to you… the flesh of swine… But whoever is compelled by necessity, neither desiring it nor transgressing its limit, there is no sin upon him.”
— Qur’an 2:173
Many contemporary Islamic authorities (including the British Islamic Medical Association and Public Health England guidance) have interpreted these principles to mean that if a halal alternative exists and is equally effective, it should be used. However, If no equivalent alternative exists, use of porcine-derived products may be permissible under the principle of necessity (darurah).
A widely cited fatwa from the British Fatwa Council states:
“We conclude the nasal flu vaccine containing porcine gelatine is permissible for use.”
This conclusion is based on two key principles:
1. Necessity (darurah). If no equally effective alternative exists, a prohibited substance may become permissible.
“Whoever is compelled by necessity… there is no sin upon him” (Qur’an 2:173)
2. Transformation (istihala). If a substance is chemically transformed, it may no longer be considered the original prohibited material. And there is NO pig DNA in the final vaccine.
The fatwa also explicitly highlights that the nasal vaccine is the most effective option for children, and important for protecting the wider community.
Could rejecting the nasal vaccine therefore even be considered more at loggerheads with the Qur'an than accepting it?.....
“Do not throw yourselves into destruction with your own hands.”
— Qur’an 2:195
And that matters.
Jewish perspectives: preservation of life
Jewish law (halacha) tends to be more permissive in this area but still promotes nuanced discussion.
A key concept is that substances which undergo significant transformation (nishtaneh) may no longer be considered the original forbidden substance. Rabbinical authorities have stated that Gelatine, due to processing, may not retain its original prohibited status. Even where concerns remain, preservation of life (pikuach nefesh) overrides most dietary restrictions.
This principle is rooted in texts such as:
“You shall keep my statutes and my laws, which a person shall do and live by them.”
— Leviticus 18:5
The emphasis being: live by them—not die by them
The principle of pikuach nefesh (preservation of life) overrides most dietary restrictions, and non-oral products (like vaccines) are generally acceptable. Even where concerns remain, protecting health takes priority. As UK guidance summarises: "Porcine ingredients in non-oral products are acceptable under Jewish law"
Vegan perspectives: a different kind of ethical tension
For vegans, this isn’t about religious permissibility, but about consistency with ethical values. And this is where the conversation often needs more depth. Because declining a vaccine on the basis of animal-derived ingredients can lead to a paradox: If you avoid the vaccine, you increase your risk of flu. If you develop complications, you may require even more medications tested on animals and possible hospital treatments involving multiple animal-derived products.
Here the concern is not religious law, but animal welfare, personal ethical frameworks, and informed consent. Unlike religious rulings, there is no formal doctrine allowing exceptions, but many individuals make contextual decisions, particularly where:
The use is medical
The quantity is very small
The benefit is significant
Again, the key role for us is not persuasion—but clear, transparent information.
So the decision isn’t “animal products vs no animal products”
It’s more accurately: “minimal, highly processed use in prevention” vs “potentially much greater use in treatment”. Even then, we can't say for certain if the vaccine they are considering would actually prevent flu, nor that they would have got flu without the vaccine. Tricky eh?
So, highlighting the risk of not having a vaccine doesn’t invalidate vegan concerns - but it reframes the decision as one of harm minimisation, not absolutes. And for many, that’s a helpful lens.
So how do we approach this in practice?
This is where our roles as clinicians really matter. Don't shy away from it.
A helpful structure might be:
Be transparent: explain exactly what’s in the vaccine
Acknowledge the concern (don’t minimise it)
Offer alternatives where they exist
Explain trade-offs honestly (especially for flu)
Signpost to faith guidance where appropriate
Support the decision, whatever it is
Because ultimately, this is about informed consent—and informed dissent.
Final thoughts
Porcine gelatine in vaccines sits right at the intersection of science, ethics, religion, and real-world public health. And flu vaccination in children is one of the few areas where there genuinely isn’t a perfect solution. But there is a good consultation. One that is honest, respectful, evidence-based, and unhurried. Because when people feel heard, they’re far more able to make decisions they can live with.
Quick Clinic Script: Porcine Gelatine in Flu Vaccines
Opening (acknowledge + invite conversation):
“That's a really important question - yes, the nasal flu vaccine does contain a very small amount of porcine gelatine. Would you like me to talk through what that means and the options available?”
Explain simply (no overload):
“The gelatine is used to keep the vaccine stable. It’s highly processed and only present in a tiny amount, but I completely understand why the origin matters to some people.”
Offer the alternative (clearly and neutrally):
“There is an alternative injection that doesn’t contain porcine gelatine.”
Explain the trade-off (this is the key bit):
“For children, the nasal vaccine tends to work better and gives broader protection. So choosing the injection is absolutely an option - but it may not protect quite as well.”
If faith-based concerns come up:
“Some religious groups have looked at this and said it may be acceptable where there isn’t an equally effective alternative—but different people come to different decisions, and that’s completely respected.”
If vegan/ethical concerns come up:
“Some people also think about this from an ethical point of view - balancing a very small amount in a vaccine against the potential need for more treatments if someone becomes unwell. But again, it’s a personal decision.”
Support autonomy (very important tone):
“My role is to make sure you’ve got all the information so you can make the decision that feels right for you.”
Close gently:
“Would you like a moment to think about it, or do you have any questions I can help with?”
Further Reading
