Why do you use give_item too often? Just use rg_set_user_bpammo (ReAPI) / cs_set_user_bpammo (cstrike).
Regarding the topic, you can use one of these:
PHP Code:
set_user_health(id, 250);
fm_set_user_health(id, 250);
set_pev(id, pev_health, 250.0);
set_entvar(id, var_health, 250.0);
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