Spermidine is widely promoted as an anti-aging polyamine, but a new mouse-derived cell study found it can sabotage a specific group of old immune cells. In senescence-like CD49d- CD8+ T cells, it cut mitochondrial respiration, depleted antioxidant reserves, and fragmented mitochondria, while neighboring CD49d+ cells were untouched. Cells from young mice responded differently, which makes age a key variable. This is preclinical work, not evidence of harm in humans, but it challenges the idea that spermidine helps every aging cell. Here's what the paper found and what it does and doesn't mean for you.
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