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Blood Donation

Rare item

+40 Harvesting
You take 1 damage per second (does not give invulnerability time)

Base price: 50
Limit: No limit
Unlock: Available from the start
Shop tags: Harvesting

Community builds that use it

BullNo weapons; Bull explodes when hit, so stack Armor, HP Regeneration and Speed to survive and pick when to take damage, plus Explosion Damage and Size. Sources disagree on damage stats: the wiki and AdamsIdeas say Melee, Ranged and Elemental Damage scale explosions equally, while B the No-Self prefers Melee and avoids Ranged/Elemental level-ups.
DoctorStay on Medical weapons, the only ones that keep the attack-speed bonus: Scissors upgrading to Circular Saw with Melee Damage, or Medical Gun with Sharp Bullet, Bandana or Ricochet for area clear. Healing is built in, so items that cost HP become affordable.
MasochistGetting hit adds % Damage, so tank hits with Armor, Max HP and HP Regeneration; Spiky Shield (unlocked by winning with Masochist) is the main recommendation, with Scissors, Ghost Axe or Medical Gun as alternatives. Blood Donation or Bloody Hand trigger the passive every second.
Time ShifterSlow, hard-hitting weapons such as Spear let the bullet-time positioning catch many enemies; items that drain 1 HP per second, such as Blood Donation, keep bullet time active.
VampireStay at low HP to boost damage and heal only through Life Steal; Spiky Shield, Stick, Lightning Shiv, Sharp Tooth or SMG are suggested, with Armor and some Dodge. Aim to keep HP around a third to half.

Characters

Shop favours its tags: Entrepreneur, Farmer

Never offered to: Wounded

Other Harvesting items

Full lists: Harvesting items.

Guides that mention it

Source

Brotato Wiki, Blood Donation, generated from the game files. Reviewed 12 November 2026.