hi evy...well, here;s more to baffle...another study from JAMA
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Login The study ran for 10 years....participants had to have a history of BCC or SCC (basal or squamous cell carcinoma)
Half the patients received 200mcg selenium and half a placebo...
"At baseline, mean plasma selenium levels were low-normal (114 ng/ml). In the selenium group, they rose to 190 ng/ml within 6 to 9 months and then dropped but remained higher than in the placebo group. There was no evidence for toxic side-effects related to selenium.
Primary endpoints: There was no statistically significant difference between the two groups in the number of new skin cancers. For SCC: 218 in the selenium group vs. 190 in the placebo group. For BCC: 377 selenium vs. 350 placebo."
perhaps just as important they found "Total cancer incidence (excluding SCC/BCC) was significantly lower in the selenium group (77 vs. 119; p=0.001; RR 0.63; 95% CI for RR 0.47-0.85).
and "After adjustment for sex, smoking and age, there was a significant reduction in all cause mortality in the selenium group, RR=0.79, due to a reduction in cancer deaths."
Notice the blood levels of those on selenium are relatively the same as my calculations of the previous study where skin cancer was reduced....190ng/ml in this study while optimal serum levels in the previous study was 102-221ng/mL..in fact the baseline of this study was in that optimal level..which may suggest that the baseline of the selenium success against bcc and scc study was so low (31-78ng/ml) as to possibly skew the results and show a 60% reduction in the higher serum selenium group...
so what does this mean...to me it says 200mcg is safe, it doesn't do much for skin cancer if you've already had it...but if you have had skin cancer, it can lower the risk of other cancers by a significant margin and add to ones life span..
if you have very low levels (that baseline calculates out to 31-78ng/ml) and never had skin cancer, then supplemental selenium can reduce the risk of skin cancer and a dosage of 200mcg yields a serum level of 190ng/ml which is in the optimal range(
but only when compared to the baseline If you have normal levels..then the difference between that and optimal may be negligible and you don't get that reduction
I agree evy....100mcg is a good dose and with that in a good diet totals out to near 200mcg ..I have to look for some more info...