Donate blood to help others, not as a detox or heart-health treatment; frequent donation can deplete iron

No money is required. Forms, the blood draw, observation, and rest take about an hour. Replacing the lost iron takes the body weeks.

Finland’s Kuopio study followed 2,862 men aged 42–60 for almost nine years on average. Among 153 who had donated in the preceding 24 months, one (0.7%) had an acute myocardial infarction; among 2,529 non-donors, 316 (12.5%) did, P<0.0001. After adjustment for age and other coronary risk factors, the relative risk was 0.12 (95% CI 0.02–0.86; P=0.035), an 88% reduction. This was observational, not randomized. The Nordic SCANDAT database included 1,182,495 donors, 9,526,627 person-years of follow-up, and 15,401 deaths. Adjusting for age, sex, and similar characteristics, each additional annual donation was associated with 18.6% lower mortality (16.8%–20.4%). Further accounting for the healthy-donor effect—remaining healthy enough to remain eligible—reduced that to 7.5% (5.7%–9.4%). The authors cautioned that this was not conclusive evidence of a health benefit. FeAST randomized 1,277 people with symptomatic peripheral arterial disease to blood removal every six months to reduce iron or to a control group. All-cause deaths were 125/636 (20%) versus 148/641 (23%), HR 0.85 (0.67–1.08; P=0.17). Death, nonfatal heart attack, or stroke occurred in 180 (28%) versus 205 (32%), HR 0.88 (0.72–1.07; P=0.20). Neither result established a difference. INTERVAL randomized 45,263 whole-blood donors to different intervals: 12, 10, or 8 weeks for men and 16, 14, or 12 weeks for women. Shorter intervals collected more blood over two years; men in the 8-week group donated 1.69 more units than those in the 12-week group (1.59–1.80). Quality of life, physical activity, and cognition did not clearly differ. However, donation-related symptoms—fatigue, breathlessness, dizziness, feeling faint, and restless legs—were more common, mean hemoglobin and ferritin were lower, and low-hemoglobin deferrals were more frequent, all P<0.0001. A small thermoregulation study compared 10 women with iron-deficiency anemia, eight with depleted iron stores but no anemia, and 12 controls during 100 minutes in 28°C water. Rectal temperature in the anemic group was 36.0±0.2°C versus 36.2±0.1°C in controls (P=0.001), and oxygen consumption was 5.28±0.26 versus 5.99±0.29 mL·min⁻¹·kg⁻¹ (P=0.04). Thyroxine and triiodothyronine were also lower (P<0.002). Repeated health screening makes donors a selected healthy group; the hypothesis that removing iron protects the heart was not confirmed in the randomized trial.

This challenges donating for your own health, not donation itself. The blood benefits other people, corresponding to the book’s fourth beneficiary category, strangers. China does provide donors with concrete institutional benefits. Article 14 of the Blood Donation Law exempts voluntary donors from collection, storage, separation, and testing fees when they need blood themselves; spouses and direct relatives may receive exemptions or reductions under provincial rules. The January 2024 National Health Commission notice said 28 provinces already applied eligible donor and family blood-use fee reductions directly at hospital discharge within the province. Recipients of blood-donation contribution awards may also qualify under local “three exemptions” policies for free public transport, admission to government-funded parks, and ordinary outpatient consultation fees at public hospitals. Observe China’s legal donation intervals: Article 9 specifies normally 200 mL per donation, no more than 400 mL, and at least six months between donations. The encouraged age range is 18–55. Do not chase the minimum interval for honors or group quotas. Women, people with low body weight, and people with heavy periods may already have limited iron reserves; repeat donors can consider paying for a ferritin test. Persistent fatigue, feeling cold, or an irresistible urge to move uncomfortable legs at night warrants a blood count and ferritin assessment. Treat confirmed deficiency as advised and lengthen donation intervals. The cold-tolerance evidence involved only 10 anemic participants: it helps explain a mechanism, not estimate how often donors develop these symptoms.

Salonen JT, Tuomainen TP, Salonen R, Lakka TA, Nyyssönen K (1998). Donation of blood is associated with reduced risk of myocardial infarction. The Kuopio Ischaemic Heart Disease Risk Factor Study. American Journal of Epidemiology, 148(5), 445–451. https://doi.org/10.1093/oxfordjournals.aje.a009669; Ullum H, Rostgaard K, Kamper-Jørgensen M, et al. (2015). Blood donation and blood donor mortality after adjustment for a healthy donor effect. Transfusion, 55(10), 2479–2485. https://doi.org/10.1111/trf.13205; Zacharski LR, Chow BK, Howes PS, et al. (2007). Reduction of iron stores and cardiovascular outcomes in patients with peripheral arterial disease: a randomized controlled trial. JAMA, 297(6), 603–610. https://doi.org/10.1001/jama.297.6.603; Di Angelantonio E, Thompson SG, Kaptoge S, et al. (2017). Efficiency and safety of varying the frequency of whole blood donation (INTERVAL): a randomised trial of 45 000 donors. Lancet, 390(10110), 2360–2371. https://doi.org/10.1016/S0140-6736(17)31928-1; Beard JL, Borel MJ, Derr J (1990). Impaired thermoregulation and thyroid function in iron-deficiency anemia. American Journal of Clinical Nutrition, 52(5), 813–819. https://doi.org/10.1093/ajcn/52.5.813; Standing Committee of China’s National People’s Congress (1997). Blood Donation Law, Articles 2, 9, and 14. https://flk.npc.gov.cn/detail?id=2c909fdd678bf17901678bf5e71801f9; National Health Commission and other agencies (8 January 2024). Notice on incentives and rewards for voluntary blood donors. https://www.gov.cn/zhengce/zhengceku/202401/content_6924875.htm.