Spermidine supplements boosted antibodies in older adults with weak vaccine responses—but most studies only tested it on cells in a dish, not people swallowing pills. The direct human data is promising but sparse. https://s.fitbodyscience.com/WXTBUu
Very strong evidence
Multiple randomized or controlled trials back these claims.
Spermidine supplements show promise for boosting older adults' vaccine response and slowing immune aging, but most evidence comes from lab dishes.
Other research supports these ideas, but with important caveats. One study directly tested the supplement in older adults and found it boosted antibody levels in those who had weak vaccine responses, and another found it reduced markers of immune cell aging—especially in people with weaker immune systems. However, several other supporting studies only added spermidine to immune cells in a lab dish, not in actual people taking pills daily. So while the direct studies are promising, much of the evidence is mechanistic, meaning it shows how spermidine might work rather than proving it works when swallowed as a supplement.
It's plausible that spermidine helps older immune systems, but the strongest evidence is from a couple of human studies, not the big trial the post implies—so take the results as encouraging but not definitive.
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